Subjects -> ENGINEERING (Total: 2791 journals)
    - CHEMICAL ENGINEERING (248 journals)
    - CIVIL ENGINEERING (242 journals)
    - ELECTRICAL ENGINEERING (176 journals)
    - ENGINEERING (1402 journals)
    - ENGINEERING MECHANICS AND MATERIALS (452 journals)
    - HYDRAULIC ENGINEERING (56 journals)
    - INDUSTRIAL ENGINEERING (100 journals)
    - MECHANICAL ENGINEERING (115 journals)

ENGINEERING (1402 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 2)
3D Research     Hybrid Journal   (Followers: 17)
AAPG Bulletin     Hybrid Journal   (Followers: 9)
Abstract and Applied Analysis     Open Access   (Followers: 1)
Aceh International Journal of Science and Technology     Open Access   (Followers: 3)
ACS Nano     Hybrid Journal   (Followers: 187)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 8)
Acta Nova     Open Access  
Acta Polytechnica : Journal of Advanced Engineering     Open Access  
Acta Universitatis Cibiniensis. Technical Series     Open Access   (Followers: 1)
Active and Passive Electronic Components     Open Access   (Followers: 5)
Adaptive Behavior     Hybrid Journal   (Followers: 8)
Additive Manufacturing Letters     Open Access   (Followers: 5)
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Energy and Sustainability Research     Open Access   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 10)
Advanced Engineering Research     Open Access  
Advanced Journal of Graduate Research     Open Access   (Followers: 1)
Advanced Quantum Technologies     Hybrid Journal   (Followers: 1)
Advanced Science     Open Access   (Followers: 11)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 8)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 3)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 19)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advances in Applied Energy     Open Access   (Followers: 4)
Advances in Catalysis     Full-text available via subscription   (Followers: 7)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 19)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 27)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 13)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 50)
Advances in Remote Sensing     Open Access   (Followers: 58)
Advances in Science and Research (ASR)     Open Access   (Followers: 8)
Aerobiologia     Hybrid Journal   (Followers: 2)
Aerospace Systems     Hybrid Journal   (Followers: 6)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
AIChE Journal     Hybrid Journal   (Followers: 31)
Ain Shams Engineering Journal     Open Access   (Followers: 1)
Al-Nahrain Journal for Engineering Sciences     Open Access  
Al-Qadisiya Journal for Engineering Sciences     Open Access  
AL-Rafdain Engineering Journal     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 21)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 7)
American Journal of Engineering Education     Open Access   (Followers: 13)
American Journal of Environmental Engineering     Open Access   (Followers: 6)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Annals of Civil and Environmental Engineering     Open Access   (Followers: 1)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 4)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 9)
Annual Journal of Technical University of Varna     Open Access  
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applications in Energy and Combustion Science     Open Access   (Followers: 2)
Applications in Engineering Science     Open Access  
Applied Catalysis A: General     Hybrid Journal   (Followers: 7)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 16)
Applied Energy     Partially Free   (Followers: 25)
Applied Engineering Letters     Open Access  
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access   (Followers: 2)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 4)
Applied Physics Research     Open Access   (Followers: 5)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 10)
Arctic     Open Access  
Arid Zone Journal of Engineering, Technology and Environment     Open Access  
Arkiv för Matematik     Hybrid Journal  
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access  
Asian Journal of Applied Science and Engineering     Open Access  
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Assembly Automation     Hybrid Journal   (Followers: 2)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
AURUM : Mühendislik Sistemleri ve Mimarlık Dergisi = Aurum Journal of Engineering Systems and Architecture     Open Access   (Followers: 1)
Australasian Journal of Engineering Education     Hybrid Journal   (Followers: 3)
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Hybrid Journal  
Autocracy : Jurnal Otomasi, Kendali, dan Aplikasi Industri     Open Access  
Automotive and Engine Technology     Hybrid Journal  
Automotive Experiences     Open Access  
Automotive Innovation     Hybrid Journal  
Avances en Ciencias e Ingenierías     Open Access  
Avances: Investigación en Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 2)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 6)
Batteries & Supercaps     Hybrid Journal   (Followers: 5)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 27)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access  
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access  
Bilge International Journal of Science and Technology Research     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Hybrid Journal   (Followers: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 11)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 10)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 3)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 4)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomicrofluidics     Open Access   (Followers: 7)
Biotechnology Progress     Hybrid Journal   (Followers: 42)
Black Sea Journal of Engineering and Science     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access  
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 12)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 15)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers Droit, Sciences & Technologies     Open Access   (Followers: 1)
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 28)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 51)
Carbon Resources Conversion     Open Access   (Followers: 2)
Carpathian Journal of Electronic and Computer Engineering     Open Access  
Case Studies in Thermal Engineering     Open Access   (Followers: 9)
Catalysis Communications     Hybrid Journal   (Followers: 7)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysis Today     Hybrid Journal   (Followers: 4)
CEAS Space Journal     Hybrid Journal   (Followers: 6)
Cell Reports Physical Science     Open Access  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 2)
CFD Letters     Open Access   (Followers: 7)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 1)
Chaos, Solitons & Fractals : X     Open Access   (Followers: 1)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 1)
Chinese Journal of Population, Resources and Environment     Open Access  
Chinese Science Bulletin     Open Access  
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Hybrid Journal   (Followers: 10)
CIRP Journal of Manufacturing Science and Technology     Hybrid Journal   (Followers: 12)
City, Culture and Society     Hybrid Journal   (Followers: 23)
Clay Minerals     Hybrid Journal   (Followers: 7)
Cleaner Engineering and Technology     Open Access   (Followers: 3)
Cleaner Environmental Systems     Open Access   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 15)
Coastal Engineering Journal     Hybrid Journal   (Followers: 7)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Coastal Management     Hybrid Journal   (Followers: 29)
Cogent Engineering     Open Access   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 2)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 18)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 21)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 27)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 243)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 177)
Composites Part B : Engineering     Hybrid Journal   (Followers: 220)
Composites Part C : Open Access     Open Access   (Followers: 1)
Composites Science and Technology     Hybrid Journal   (Followers: 149)
Comptes Rendus : Mécanique     Open Access   (Followers: 2)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Computational Optimization and Applications     Hybrid Journal   (Followers: 9)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 15)
Computers & Geosciences     Hybrid Journal   (Followers: 29)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 7)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 31)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)

        1 2 3 4 5 6 7 8 | Last

Similar Journals
Journal Cover
Bulletin of Engineering Geology and the Environment
Journal Prestige (SJR): 0.896
Citation Impact (citeScore): 2
Number of Followers: 15  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1435-9537 - ISSN (Online) 1435-9529
Published by Springer-Verlag Homepage  [2484 journals]
  • Experimental investigation of nano-ZnO effect on mechanical properties of
           cemented clayey sand

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      Abstract: To date, various nanomaterials have been used in the literature for soil improvement. However, the application of Nano-ZnO (NZ) to the ultrasonic pulse velocity (UPV) in cement-cured clayey sand soils and the relationship between UPV and unconfined compressive strength (UCS) have not been addressed. A series of UCS and UPV tests were performed to investigate the effects of NZ on the mechanical properties of cemented clayey sand. In addition, the microstructural properties of cemented clayey sand with NZ additive were investigated using a high-resolution field-emission scanning electron microscopy (FESEM). The response surface method (RSM), an experimental technique to reduce the number of tests and the cost of research, was used to design the experiments and evaluate and optimize the results. The results showed that using NZ as an additive enhances the mechanical properties of cemented clayey sand. The correlation with an acceptable determination coefficient between UPV and UCS was suggested at different ages. The correlation with a high determination coefficient between elastic modulus and UCS was also presented. The examination of FESEM images showed that the micro-cracks are reduced in the samples containing NZ. Also, in the samples containing NZ, the calcium hydroxide (CH) size decreased and its orientation is also moderated.
      PubDate: 2022-01-15
       
  • Influences of water on the microstructure and mechanical behavior of the
           Xigeda formation

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      Abstract: As a typical hard soil and soft/weak rock, the Xigeda formation is a set of Cenozoic lacustrine semi-rock discontinuously distributed in south-western China. Engineering practice shows that water exerts a significant influence on the mechanical properties of the Xigeda formation. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and triaxial compression tests were conducted by means of in situ sampling of the Xigeda formation in Zhaizi village along the Jiasha River. The mineral composition and microstructure were determined, the deformation and failure mechanisms were investigated, and influences of the water content on both deformation and strength indices were discussed. The results show that (a) the Xigeda formation has a characteristic weakly cemented structure, which differs from that of soil and rock, and this cemented structure is easily damaged under saturated conditions; (b) with increasing water content, both average modulus and shear strength of the Xigeda formation decrease significantly, and influence of water content on peak strength is much greater than that on residual strength; and (c) in the range of tested conditions (w = 17.79 ~ 30.83%, σ3 = 200 ~ 800 kPa), both the peak and residual strengths meet the Mohr–Coulomb criterion. The results can provide an experimental basis and mechanism informing engineering practice in the Xigeda formation.
      PubDate: 2022-01-13
       
  • System safety assessment with efficient probabilistic stability analysis
           of engineered slopes along a new rail line

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      Abstract: A proper stability assessment of engineered cutting and embankment slopes is crucial to safe train operation and the performance management of rail infrastructure. Through the presentation of a case study, this paper develops a methodology for the safety evaluation of large-scale slope systems incorporating efficient probabilistic stability analysis of engineered slopes for a long rail line under construction. A long geotechnical slope is equally segmented into multiple consecutive sections according to the representative value of the local failure lengths of three-dimensional slopes, and each section is assessed for its probability of failure ( \({P}_{f}\) ). Soft computing by multivariate adaptive regression splines (MARS) is incorporated into the reliability analysis of a batch of slope segments. The construction of a MARS model requires a subset of data samples obtained from a limit equilibrium slope stability program; the validated MARS model is then used to generate the probability of failure of the rest of slope sections. The \({P}_{f}\) values for 2691 sections in total, determined by either direct probabilistic stability analysis or the MARS-derived predictive model, is subsequently introduced into a reliability-based performance evaluation of the long railway geotechnical slope system. The k-out-of-n system model is adopted to characterize the relationship between the entire system and its components concerning safety. The effect of remediation on the reliability of geotechnical system is finally explored by examining the variation characteristics of \({P}_{f}\) with a tolerable number of failure segments in the system. The proposed methodology can be readily extended to assess large-scale geotechnical systems for an operational rail line.
      PubDate: 2022-01-12
       
  • Influence of wing crack propagation on the failure process and strength of
           fractured specimens

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      Abstract: The wing cracks are usually the first crack that appears in the loading process in studies about fractured rocks, and a certain correlation exists between the wing crack propagation process and the peak strength of fractured specimens. To further explore the correlation between wing crack propagation and the peak strength of specimens, specimens containing the main flaw and prefabricated wing cracks were chosen as the test object, and compression tests and numerical simulations were carried in this study. To some extent, it can be regarded as a step-by-step simulation and reproduction of the propagation process of wing cracks. The loading and monitoring processes and the analysis of results reveal that specimens with the prefabricated wing cracks show more plasticity in the loading process than the other specimens without the prefabricated wing cracks. However, the length of prefabricated wing cracks does not affect the peak strength of the specimen. The wing crack has a critical length of the stable propagation for each specimen with a single flaw under uniaxial compression, which determines the peak strength of specimen. When the length of wing cracks extends to this critical value, the specimen reaches its peak strength. On this basis, the peak strength of the fractured specimen can be solved using this critical value. This paper provides a reference for the theoretical analysis of the peak strength of fractured specimens.
      PubDate: 2022-01-12
       
  • Three-dimensional method for slope stability with the curvilinear route of
           the main sliding

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      Abstract: The route of the main sliding is considered to be a linear line in the existing three-dimensional limit equilibrium methods for slope stability analysis. However, there is a curvilinear route for the main sliding caused by the translational movement and the rotation of the sliding body in slope failures. In this study, a three-dimensional limit equilibrium method was proposed for slope stability with the curvilinear route of the main sliding. The basic physical quantities for slope stability analysis in the orthogonal curvilinear coordinate system were obtained by the mapping between the orthogonal curvilinear coordinate system and the Cartesian coordinate system. The four equilibrium equations (a force equilibrium equation and three moment equilibrium equations) were established by the equilibrium conditions of the entire sliding body. The three-dimensional factor of safety for the slope with the curvilinear route of the main sliding was deduced by an analytical or a numerical method. Some examples proved that the present method can calculate the factor of safety and evaluate the stability of the slope. The results of examples showed that the factor of safety of the curvilinear route was significantly smaller than that of the linear route. The three-dimensional limit equilibrium method for slope stability analysis was further developed in this study, which provided a theoretical basis for the scientific and reasonable evaluation of slope stability.
      PubDate: 2022-01-12
       
  • Short- and long-term transports of heavy metals through earthen liners:
           physical and numerical modeling

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      Abstract: The effectiveness of earthen liners in preventing the migration of heavy metals (HM) from the landfill requires the study of the transport parameters of HM and the determination of the optimum thickness of the earthen liners that can effectively retain the HM within their permissible concentrations during the lifetime of a landfill. The aim of this study is to investigate the transport behavior of four HM (cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn)) through an earthen liner via physical and numerical modeling. Subsequently, the optimum thickness of earthen liners required to prevent the breakthrough of HM for different assumed landfill life expectancies was assessed from the long-term migration profiles of HM. In general, the extent of HM migration in two types of compacted residual soil liners, which were clayey sand and silty sand, followed the sequence of Zn < Cd < Cu < Pb. It is observed that the extent of HM migration was greater in the compacted silty sand sample attributed to its higher porosity and lower HM adsorption capacities. The numerical simulations results further revealed that the optimum thickness required for compacted clayey and silty sand liners to retain the four studied HM within their regulatory threshold values for a period of 100 years were 1 m and 1.9 m, respectively. Considering the higher mobility and more stringent allowable concentration of Cd, Cd can serve as a key indicator of early HM contamination caused by leachate migration from Malaysian municipal solid waste landfills.
      PubDate: 2022-01-12
       
  • Investigation on intrusion of bentonite–sand mixtures in fractures with
           consideration of sand content and seepage effects

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      Abstract: During the long-term operation of a repository, bentonite–sand mixture could invade into fractures in the surrounding rock with infiltration of groundwater, resulting in loss of bentonite from the barrier with possible leakage of nuclides and consequently endangers the safety of the repository. In this work, an apparatus was designed with an artificial joint (fracture) being made between two parallel stacked transparent acrylic plates with a stainless-steel gasket inserted. Intrusion tests were conducted on the mixture specimens with different sand contents into artificial fractures with two sizes. A flow with constant velocity was applied to simulate seepage in the surrounding rock formations. Images were regularly captured with a camera, and parameters including the intrusion distance and widths of the non-accessory and accessory mineral rings were determined using a commercial software. Simultaneously, fluid was collected at the outlet and the erosion rate bentonite was determined by a turbidimeter. Finally, based on the force equilibrium, an intrusion model for describing bentonite–sand mixture intrusion into fractures with consideration of sand content and seepage effects was established and verified. Results show that the intrusion distance, two-region widths, and erosion mass decrease significantly with increasing sand content. After intrusion, the dry density of the bentonite specimen nearby the extrusion port decreases with increasing sand content and fracture size. Meanwhile, results of XRD tests indicate that the ratio of accessory minerals in the accessory mineral ring was higher than that in the pure Gaomiaozi bentonite specimen. Verifications confirmed that the intrusion model proposed in this work can well simulate the data measured.
      PubDate: 2022-01-12
       
  • Effect of pH on the mechanical performances of cement/slag-stabilized
           marine sediments: Experimental and analytical constitutive modelling

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      Abstract: While stabilized marine sediment (SMS) is widely used in construction projects, its mechanical response may be influenced by its environment, such as contact with liquids of different pH value, the extent of which is not well understood. In this context, a marine sediment stabilized with Ordinary Portland Cement (OPC) and Ground-Granulated Blast Furnace Slag (GGBS) is studied in this paper. Unconfined compressive strength (UCS) tests, mass loss analyses and micro-structure evaluations were conducted on SMS specimens having different curing durations (7, 28, 56 and 98 days) and in contact with liquids with different pH values (1, 7 and 10) for 100 days in a tank leaching setup. The results indicate that 1) replacement of OPC by GGBS in the ratio of 1:1 is most efficient in improving the UCS of the SMS considered herein; 2) UCS values determined after leaching at pH=7 and 10 are greater than those without leaching, whereas UCS values after leaching at pH=1 are lower than those without leaching, and 3) a reduced mass loss and a more compact structure occurs with greater leachate pH. Based on the experimental observations, a novel elastoplastic constitutive model with analytical stress–strain solutions is presented to describe the mechanical behaviour of SMS. The influences of two factors (leachate pH and curing durations) on the model parameters are analysed using the binary quadratic nonlinear regression method. The analytical model is shown to be capable of predicting the mechanical performance in various pH environments, representative of a variety of SMS applications.
      PubDate: 2022-01-11
       
  • Physical model test on deformation and failure mechanism of deposit
           landslide under gradient rainfall

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      Abstract: Rainfalls with heavy intensity and long duration are the main factors that trigger landslide. A large-scale test of physical model of landslide induced by gradient rainfall is conducted to investigate the mechanism of landslide caused by rainfalls with an indoor large-scale physical model test system. By monitoring the variation of pore water pressure, soil pressure, slope surface displacement, and groundwater level, the deformation and failure mechanism of deposit landslide under gradient rainfall are studied. The results show that the pore water pressure and soil pressure increase with the increase of the duration of rainfall, and the greater the rainfall intensity is, the greater the peak values of pore water pressure and soil pressure are. The intensity and duration of rainfall are the main influencing factors of landslide deformation. The decrease of effective stress and the rise of groundwater level are the root causes of landslide deformation. During a rainfall, excessive pore water pressure appears in the slope, which can be used as an early warning indicator of landslide deformation and failure. The deformation of slope body is nonlinear and shows a stepped pattern under gradient rainfall. During a rainfall, the toe of the slope is usually damaged first. Tension cracks appear in the rear edge and the middle part of the slope successively, showing the characteristics of traction failure.
      PubDate: 2022-01-11
       
  • Geochemical, mineralogical, and microstructural characteristics of fault
           rocks and their impact on TBM jamming: a case study

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      Abstract: Faults can represent adverse geological conditions that frequently cause the jamming of tunnel boring machines (TBMs). In this study, we present a case study of TBM jamming at mileage 106 + 402.8 in the TBM 2 bid section of the Central Yellow River Diversion in China. Firstly, we identify possible jamming hazards. In addition, a fault between dolomitic limestone and granite was revealed by the geological investigation. Secondly, by comprehensively analyzing the geochemical, mineralogical, and microstructural characteristics of the host and fault rocks, we identify the compressional torsional fault FT2 and the nearby fault rocks. Finally, we explore how the geological characteristics of the fault rocks affect the likelihood of TBM jamming. Our results indicate that geochemical effects and long-term tectonic stresses caused major changes in the structure and composition of the migmatitic granite host rock; the fault rocks exhibit mylonitization and cataclastic breccia fabrics. Hydrothermal fluid alteration transformed the biotite and plagioclase into chlorite. In addition to the precipitation of carbon-rich fluids, which resulted in the formation of graphite, the weaknesses of these fault rocks were compounded by the presence of clay minerals and their obvious cataclastic structures. The comprehensive effect of the geological characteristics of fault rock, geological structure, ground stress, and TBM excavation unloading leads to collapse and large deformation of the weak rock in the fault zone as the main geological reason for the TBM jamming; the corresponding engineering treatment measures and recommendations are proposed. This case aims to provide reference and learning for avoiding the re-occurrence of similar jamming accidents.
      PubDate: 2022-01-10
       
  • Experimental and numerical study of the mechanism of block–flexure
           toppling failure in rock slopes

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      Abstract: Block-flexure is the commonest mode of toppling failure and can be frequently encountered in anti-inclined rock slopes. In this work, the failure mechanism of block–flexure toppling (BFT) was investigated using centrifugal and numerical models. The numerical model was configured using the Universal Distinct Element Code (UDEC) and calibrated with the results of the centrifuge test. All the simulation results, including the measured displacements, failure load, and failure surface, are generally in line with that of experimental results. Further, the results of simulations show that, well before the appearance of instability in the jointed rock slope, slipping failure and opening fractures had occurred in the interlayer. Moreover, all the acting points of normal forces in steep joints are located between the bottoms and the midpoints of the columns under consideration, in the process of toppling failure. Finally, sensitivity of joint parameters, including the connectivity rate of discontinuous cross-joints, the thickness of the rock column joint, joint friction angle, and joint cohesion, were performed to investigate the effects of the tensile strength of intact rock. The results indicate that joint cohesion and thickness of the rock column greatly influence the failure load (represents safety factor of the slope). The connectivity rates of the discontinuous cross-joints and joint friction angle were found to have significant effects on the shape and location of the basal failure plane. This research would provide a deep understanding on the failure mechanism of BFT for relevant scholars.
      PubDate: 2022-01-10
       
  • The effect of mineralogy on the microwave assisted cutting of igneous
           rocks

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      Abstract: Hard rocks can be excavated difficultly by some mechanical miners such as roadheaders. Tunnel boring machines (TBMs) can excavate hard rocks, but the cost is high due to low advance rate and high tool wear. The difficulties in hard rock excavation can be overcome by exposing hard rocks to microwave energy while cutting. This study investigates influence of mineralogy on the microwave assisted cutting of igneous rocks. The normal and cutting forces were measured during the cutting tests, and the specific energy values were calculated. The optimum specific energy (SEopt.) values reduce quite steadily with the increasing microwave power. The SEopt. of some tested crystalline rocks first increases at the low power (3 kW) and then decreases at the high power (6 kW). The losses in the SEopt. range from 22.5 to 38.7% at the power of 6 kW. The equations were also developed for the estimation of the SEopt. loss. Concluding remark is that the same rock types may be affected differently by microwave energy because of the different mineral types and percentages, and thus they behave diversely under cutting tests. The derived equations will be useful for the prediction of the SEopt. loss due to the microwave treatment.
      PubDate: 2022-01-10
       
  • Experimental investigation of unconsolidated undrained shear behaviour of
           peat

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      Abstract: This study conducted a series of standard classifications to determine the physical properties of peat, followed by 28 unconsolidated undrained triaxial tests to investigate undrained peat shear behaviour. Results show that the undrained deviatoric shear resistance of peat grows continuously with increasing shear strain, but ends up with no obvious peak strength even at very large strain (i.e. 25%). The shear stiffness of peat specimens degrades substantially with increasing shear strain. To make the stiffness of peat specimens comparable, the secant shear modulus G is then normalized with the shear modulus \({G}_{0.1\%}\) at relatively small strain of 0.1%. Furthermore, results from 16 previous unconsolidated undrained tests and 66 consolidated undrained tests available in literature were taken into account together with 28 lab test data obtained in this study, aiming to reveal the general behaviour of peat shear stiffness degradation. For all the test data, the shear strain \(\gamma\) is normalized with a reference strain \({\gamma }_{\mathrm{ref},0.1\%}\) , at which the stiffness \(G\) / \({G}_{0.1\%}\) = 0.5. A hyperbolic function is then adopted to fit the relationship between the normalised stiffness versus the normalised shear strain. Over 78% of the data falls within a ± 30% margin within 5% shear strain, while the predicted stiffness out of the margin is usually underestimated.
      PubDate: 2022-01-08
       
  • Fracture analysis of central-flawed rock-like specimens under the
           influence of coplanar or non-coplanar edge flaws

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      Abstract: To better understand the influence of edge flaws on the fracture behaviors of central-flawed specimens, a series of uniaxial compression tests were carried out on the central-flawed rock-like specimens with two edge flaws using a servo-controlled testing apparatus. Two edge flaws were divided into coplanar and non-coplanar distribution (F-L1 and F-L2). The acoustic emission, digital image correlation and high precision video were applied simultaneously to monitor the internal AE signals, surface strain, and crack propagation of rock-like materials, respectively. The results show that the degradation effect of non-coplanar edge flaws on the peak strength, elastic modulus, and crack initiation angle are more significant than that of coplanar edge flaws. When the inclination angle of the central flaw increases from 15° to 60°, the peak strength, elastic modulus, and crack initiation angle decrease. In contrast, the complete initiation angle, total energy density, and accumulated acoustic emission energy first decrease and then increase. The acoustic emission counts and acoustic emission accumulated energy occur a sudden increase when the rock-like specimen deforms into the next stage. Moreover, central flaw controls the initiation of new cracks, whereas edge flaws influence the propagation trajectories of new cracks. Furthermore, the coalescence between the central and edge flaws in the F-L2 specimen is easier to happen than that in the F-L1 specimen.
      PubDate: 2022-01-08
       
  • An extreme gradient boosting technique to estimate TBM penetration rate
           and prediction platform

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      Abstract: An accurate prediction of the penetration rate (PR) of a tunnel boring machine (TBM) is essential for the schedule and cost estimation of tunnel excavation. To better meet the needs of modern information construction, more computer technologies are being used to integrate the analysis and management of construction data. Herein, an online prediction platform based on a data mining algorithm using ensemble learning (extreme gradient boosting (XGBoost)) is developed for TBM performance prediction. The platform establishes the model and displays the prediction results, while storing a considerable amount of machine data, and providing services for TBMs of multiple projects simultaneously. In establishing the prediction model, users can change the algorithm parameters according to the engineering situation. The prediction capabilities of the platform are demonstrated by 200 field samples obtained from the Songhua River water conveyance project in Jilin. The mean absolute percentage error, coefficient of determination, root mean squared error, variance account for (VAF), and a20-index of the PR are 6.07%, 0.8651, 3.5862, 87.06%, and 0.925, respectively. The results show that the prediction model has a reliable prediction accuracy, which is higher than that of the gradient boosting decision tree, and these results can be displayed on the online platform. It provides effective help for TBM intelligent tunneling.
      PubDate: 2022-01-07
       
  • Geomechanical zonation using multivariate fractal modeling in Chadormalu
           iron mine, Central Iran

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      Abstract: The present study was conducted to identify geomechanical zonation utilizing multivariate fractal approach. For this purpose, data of geomechanical borehole samples obtained from the Chadormalu iron mine located in the Central Iran were analyzed. Firstly, factor analysis was carried out based on the estimated geomechanical model, and the factors related to rock mass (F1) and structures and joints (F2) were separated. Then, these factors were classified by concentration-volume (C-V) fractal model. There were five populations for both of them based on the C-V log–log plots. Geomechanical zones were correlated with lithological units by logratio matrix. Highly and very highly strong zones of both factors were correlated with plutonic rocks, representing that these zones were associated with granitic rocks, located in deep and central parts of this open pit. Furthermore, weak zones of F1 were correlated with schists, but weak zones of F2 were associated with breccias and conglomerates. Weak zones were situated in marginal parts of the Chadormalu mine.
      PubDate: 2022-01-07
       
  • Relevant geological-geotechnical parameters to evaluate the terrain
           susceptibility for shallow landslides: Nova Friburgo, Rio de Janeiro,
           Brazil

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      Abstract: This study aims to contribute to the analysis and classification methodology of geological derivation information regarding the detailed zoning of terrain susceptibility to the occurrence of shallow landslides. A geological-geotechnical classification model for the Córrego D’Antas basin (53 km2) was proposed from a geological map (1:10,000). The analysis was based on a set of data built through field investigations and laboratory experiments, later submitted to statistical treatment. Thirty samples were collected from five lithological units and then classified according to the type of material (COL, colluvium; MRS, mature residual soil; YRS, young residual soil) about the following geotechnical parameters: (i) particle size distribution, (ii) Atterberg limits, (iii) stability of aggregates, (iv) void index, (v) dry unit weight, (vi) in situ saturated hydraulic conductivity, (vii) effective cohesion, and (viii) internal effective friction angle. The results allowed the definition of the behavior of the types of materials and the division of the lithological units into three geological-geotechnical units: (i) unit I—gabbro, (ii) unit II—equigranular granite, (iii) unit III—diorite, granodiorite granite, and orthogneiss. These geological-geotechnical units showed a good correlation with the critical classes for landslides related to hydro-geomorphological conditions, vegetation and land use, and slope angle (> 30°). The proposed classification represents an advance in the understanding of geotechnical parameters that are part of the prediction of models of terrain susceptibility to shallow landslides from the geo-hydroecological approach. In addition, it provides an input database for physics-based model predictions in mountainous region.
      PubDate: 2022-01-06
       
  • Evaluation of debris flow and landslide hazards using ensemble framework
           of Bayesian- and tree-based models

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      Abstract: The modeling and prediction of land movement susceptibility hazards, i.e., debris flow, landslide, and rock fall, can assist in controlling and preventing a variety of societal and environmental damages. The purpose of this study was to develop a land movement susceptibility hazard model of debris flow, landslide, and multiple land movement, i.e., combination of debris flow and landslide in the Saveh city of Markazi Province, Iran, using an ensemble of Bayesian generalized linear model (BGLM), sparse partial least squares (SPLS), boosted tree (BT), and random forest (RF) algorithms. For this purpose, 167 debris flow points, 261 landslide points, and 257 multiple (debris flow and landslide) points were identified based on field visits and available information, and 15 suitable conditioning factors were prepared as independent variables for this study. The accuracy and efficiency of the models were assessed using the receiver operating characteristic (ROC) and other statistical indices. The variable importance result indicates that slope is the most important factor in debris flow (25.53), landslide (31.39), and multiple hazard (41.90) occurrences. The accuracy assessment results in the validation phase revealed that the RF is the most optimal among the applied algorithms, with area under the curve (AUC) values of 0.90, 0.94, and 0.89 for debris flow, landslide, and multiple (D + L) hazard modeling. The findings of this study indicated that the use of a Bayesian and tree-based ensemble model in preparing a land movement-related disaster map could be useful among policymakers and land use planners for sustainable land use management and practices.
      PubDate: 2022-01-05
       
  • Geotechnical characterization of low-porous limestones (beige–cream
           marble, Turkey) and evaluation of durability by salt crystallization
           experiments

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      Abstract: Water, which is an important factor considering the decay of building stones, dissolves salts and causes them to move into the pores in stones. Salts are the most important deterioration agents for stones. Three low-porous limestones (beige-cream marble) were examined in this research. The selected limestone samples are characterized by mineralogical-petrographic (optical microscope, SEM), chemical (XRF), and mechanical-physical properties. The durability of the tested limestones was investigated using a salt crystallization test according to TS EN 12,370. These tests were conducted by applying immersion-drying cycles with water containing sodium sulfate or sodium chloride. The weight loss of the samples was determined after 15 cycles. Changes in the structure of the limestones (beige-cream marble) after these salt crystallization tests were determined using SEM, uniaxial compressive strengths, and ultrasonic wave measurements. According to test results of the salt crystallization values, all tested limestones had a dry weight loss of less than 1.0%. The ultrasonic sound velocity and uniaxial compressive strengths were measured before and after the tests. The analysis of the strength test results on samples subjected to salt crystallization showed a decreased resistance for the limestones. This situation is confirmed by decreased P-wave velocity values. The changes reached from 2.12 to 14.67% for sodium sulfate solution. These ratios were in the range of 2.64 to 10.66% at the sodium chloride solution. Results suggested that the beige-cream marbles are fine-grained limestone, characterized by low porosity and, consequently, very notable salt crystallization resistance.
      PubDate: 2022-01-05
       
  • Correction to: Durability assessment of some Cappadocian tuffs using
           factor analysis, multiple regression analysis, and analytical hierarchy
           process

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      PubDate: 2022-01-04
       
 
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