Subjects -> MINES AND MINING INDUSTRY (Total: 82 journals)
Showing 1 - 42 of 42 Journals sorted alphabetically
American Mineralogist     Hybrid Journal   (Followers: 16)
Applied Earth Science : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
Archives of Mining Sciences     Open Access   (Followers: 3)
AusiMM Bulletin     Full-text available via subscription   (Followers: 1)
BHM Berg- und Hüttenmännische Monatshefte     Hybrid Journal   (Followers: 2)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
CIM Journal     Hybrid Journal   (Followers: 1)
Clay Minerals     Hybrid Journal   (Followers: 9)
Clays and Clay Minerals     Hybrid Journal   (Followers: 5)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 14)
Environmental Geochemistry and Health     Hybrid Journal   (Followers: 3)
European Journal of Mineralogy     Hybrid Journal   (Followers: 14)
Exploration and Mining Geology     Full-text available via subscription   (Followers: 3)
Extractive Industries and Society     Hybrid Journal   (Followers: 2)
Gems & Gemology     Full-text available via subscription   (Followers: 2)
Geology of Ore Deposits     Hybrid Journal   (Followers: 5)
Geomaterials     Open Access   (Followers: 3)
Geotechnical and Geological Engineering     Hybrid Journal   (Followers: 9)
Ghana Mining Journal     Full-text available via subscription   (Followers: 3)
Gold Bulletin     Hybrid Journal   (Followers: 2)
Inside Mining     Full-text available via subscription  
International Journal of Coal Geology     Hybrid Journal   (Followers: 4)
International Journal of Coal Preparation and Utilization     Hybrid Journal   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Hospitality & Tourism Administration     Hybrid Journal   (Followers: 16)
International Journal of Mineral Processing     Hybrid Journal   (Followers: 8)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 12)
International Journal of Mining and Geo-Engineering     Open Access   (Followers: 4)
International Journal of Mining and Mineral Engineering     Hybrid Journal   (Followers: 8)
International Journal of Mining Engineering and Mineral Processing     Open Access   (Followers: 6)
International Journal of Mining Science and Technology     Open Access   (Followers: 4)
International Journal of Mining, Reclamation and Environment     Hybrid Journal   (Followers: 6)
International Journal of Rock Mechanics and Mining Sciences     Hybrid Journal   (Followers: 9)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access   (Followers: 1)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 18)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of China Coal Society     Open Access  
Journal of China University of Mining and Technology     Full-text available via subscription   (Followers: 1)
Journal of Convention & Event Tourism     Hybrid Journal   (Followers: 6)
Journal of Geology and Mining Research     Open Access   (Followers: 10)
Journal of Human Resources in Hospitality & Tourism     Hybrid Journal   (Followers: 9)
Journal of Materials Research and Technology     Open Access   (Followers: 2)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 17)
Journal of Mining Institute     Open Access  
Journal of Mining Science     Hybrid Journal   (Followers: 5)
Journal of Quality Assurance in Hospitality & Tourism     Hybrid Journal   (Followers: 6)
Journal of Sustainable Mining     Open Access   (Followers: 3)
Journal of the Southern African Institute of Mining and Metallurgy     Open Access   (Followers: 6)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 4)
Lithos     Hybrid Journal   (Followers: 11)
Mine Water and the Environment     Hybrid Journal   (Followers: 6)
Mineral Economics     Hybrid Journal   (Followers: 2)
Mineral Processing and Extractive Metallurgy : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 14)
Mineral Processing and Extractive Metallurgy Review     Hybrid Journal   (Followers: 5)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogical Magazine     Hybrid Journal   (Followers: 1)
Mineralogy and Petrology     Hybrid Journal   (Followers: 5)
Minerals     Open Access   (Followers: 2)
Minerals & Energy - Raw Materials Report     Hybrid Journal   (Followers: 1)
Minerals Engineering     Hybrid Journal   (Followers: 14)
Mining Engineering     Full-text available via subscription   (Followers: 7)
Mining Journal     Full-text available via subscription   (Followers: 4)
Mining Report     Hybrid Journal   (Followers: 3)
Mining Technology : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
Mining, Metallurgy & Exploration     Hybrid Journal  
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 5)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Minerals     Hybrid Journal   (Followers: 4)
Podzemni Radovi     Open Access  
Rangeland Journal     Hybrid Journal   (Followers: 4)
Réalités industrielles     Full-text available via subscription  
Rem : Revista Escola de Minas     Open Access  
Resources Policy     Hybrid Journal   (Followers: 4)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 5)
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 9)
Rocks & Minerals     Hybrid Journal   (Followers: 5)
Rudarsko-geološko-naftni Zbornik     Open Access  
Transactions of Nonferrous Metals Society of China     Hybrid Journal   (Followers: 9)
Similar Journals
Journal Cover
Geotechnical and Geological Engineering
Journal Prestige (SJR): 0.611
Citation Impact (citeScore): 1
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0960-3182 - ISSN (Online) 1573-1529
Published by Springer-Verlag Homepage  [2653 journals]
  • Analysis of Beams on Pasternak Foundation Using Quintic Displacement
           Functions
    • Abstract: Beams supported by elastic foundations one of the complex soil-structure interaction problems and analysis carried out using the concept of “beam on elastic foundation” approach. The structural foundation and the soil continuum must act together to support the loads. Developing more realistic foundation models and simplified methods are very important for safe and economical design of such type of structure. In the present study, a first order continuity three nodded beam based on Euler–Bernoulli assumptions and a workable approach for the analysis of beams on Pasternak foundation is attempted. A Matlab code is developed for present formulation. The results, thus obtained, are compared with similar studies done by other researchers, which show very good conformity. Parametric studies are carried out to obtain response for different loading conditions, boundary conditions and foundation parameter.It is concluded that the present formulation has rapid convergence regardless of boundary conditions, aspect ratio and foundation parameters. It behaves extremely well for Euler–Bernoulli beams effectively and efficiently. The effect of the soil coefficient on the response of beams on two parameter elastic foundation is generally larger than that of beam physical and material property.
      PubDate: 2021-03-12
       
  • Discussion of “Geopolymers Based on Recycled Glass Powder for Soil
           Stabilization” Jair de Jesús Arrieta Baldovino; Ronaldo dos Santos
           Izzo; Juliana Lundgren Rose; Mônica Angélica Avanci
    • Abstract: Discussers offered comments to enhance results analysis. An alternative evaluation was proposed using the η/Biv index, where the Biv parameter, named as volumetric binder content, is expressed as a percentage of cementitious binder, which means for this work the sum of volumetric cement content plus volumetric glass powder content. Finally, background literature was suggested.
      PubDate: 2021-03-10
       
  • Experiment on the Effect of Freezing–Thawing Cyclic on Mechanical
           Properties of Solidified Sludge
    • Abstract: The solidification technology of sludge can effectively solve the problem of environmental pollution and resource shortage. Whereas, the current study lacks the exploration of the durability of solidified sludge. The freeze–thaw cycle test and the moisture transfer test were carried out to test the freeze–thaw resistance and the failure mechanism of the solidified sludge. The results showed that the content of fly ash has a significant effect on the freeze–thaw cycle of the mechanical properties of the solidified sludge. The stress–strain relationship of different dosage samples tends to approach the number of freeze–thaw cycles increases. The stress–strain curve of the samples under all confining pressures is strain-hardening type, which failure mode is ductile failure. The incorporation of fly ash can improve the failure strength and cohesion of cement–lime solidified soil, and gradually increase with the increase of fly ash content. The freeze–thaw cycle test is carried out under the closed system. The moisture in the sample migrates under the temperature load, causing the water content to increase and decrease the partition distribution. The sample with lower fly ash content has smaller static pressure density, which is beneficial to water migration. And increasing the range of water increase zone, the effect of the sample on the freeze–thaw cycle is relatively small. However, the influence of the number of freeze–thaw cycles on the internal friction angle of each soil sample depends largely on the distribution of water in the soil sample, it does not appear regular changes. During the freezing and thawing process, the effects of fly ash content and water redistribution on the mechanical properties of the solidified sludge are simultaneous. In short, the samples with different ratios and freeze–thaw cycles have different factors influencing the change of strength.
      PubDate: 2021-03-09
       
  • Reply to Discussion “Geopolymers Based on Recycled Glass Powder for Soil
           Stabilization” Jair de Jesús Arrieta Baldovino, Ronaldo Luis dos Santos
           Izzo, Juliana Lundgren Rose, and Mônica Angélica Avanci
    • PubDate: 2021-03-08
       
  • Research on Meso-mechanism of Failure Mode of Tunnel in Jointed Rock Mass
    • Abstract: The natural rock that contains micro particles, holes, cracks, impurities, etc. has a complex composition. According to whether the crack is closed or not, kinds of cracks can be divided into two types: open type and closed type. There was a bottleneck in the preparation of the test piece when the indoor test method analyzes the built-in closed cracks of rock materials, so PFC has its unique advantages in simulation analysis of fractured rocks with closed cracks. In order to analyze the influence of the inclination angle, length of the crack above the tunnel and the tunnel spacing on the tunnel failure and crack propagation, the particle was based on the granular flow microscopic parameters. It was shown that with the increase of the inclination of the pre-crack on the upper side of the tunnel, the distance of the tunnel and the length of the crack, the final failure mode of the specimen is similar to that of the non-crack specimen. The initiation of the crack at the end of a certain length of prefabricated crack is mainly affected by its inclination angle. The greater the inclination angle, the earlier the crack initiation is relatively early.
      PubDate: 2021-03-05
       
  • Application of Extension Theory Based on Improved Entropy Weight Method to
           Rock Slope Analysis in Cold Regions
    • Abstract: In view of the problems existing in the evaluation process of slope stability in cold regions, the improved entropy weight method and extension theory are used to evaluate the slope stability. Nine indexes which affect the slope stability in cold regions are selected, the matter element system of slope stability evaluation is established by extension theory, and the extension correlation degree between evaluation index and evaluation grade is calculated. The improved entropy weight method is used to calculate the entropy weight of the matter element index system, and then the stability grade of the slope matter element is determined. Based on the extension theory and improved entropy weight method, the slope stability of Beizhan open pit mine is predicted. The results show that the prediction results are consistent with the actual situation of the project, and the evaluation method can be applied to the slope stability evaluation in cold regions. By using extension theory and improved entropy weight method, the evaluation index can be changed from a single determined value to an interval value, and the influence degree of the evaluation index can be analyzed more comprehensively. This method improves the evaluation accuracy and provides a new method for the slope stability evaluation in cold regions.
      PubDate: 2021-03-04
       
  • Study on Shear Strength of Cement Face Between Rock and Concrete
    • Abstract: The samples of slightly weathered granite drilled before the construction of Runyang suspended bridge's north anchorage are used as the research object in this paper. Through a lot of shear strength tests of concrete-bedrock rough cement face, the influence of the cement face roughness on the shear strength, shear deformation characteristics and shear failure mechanism were systematically studied. The results show that: The post-peak stress–strain curves of smooth and rough cement faces are obviously different. The shear stress–strain curve of cement face can be generalized into 3 types. The shear stress–strain model of rough cement face is the most general form, and the smooth cement face and no cementation are its special cases. The empirical relation between cement face roughness JRC and shear strength parameters is established by the fitting of experimental data. When the cement face is climbing, the internal friction angle increases with the climbing angle. When the climbing angle is constant, the increase of cohesion is positively correlated with the ratio of fluctuation difference and wavelength. When the climbing thrust is equal to the gnawing thrust, the specimen is transformed from climbing to gnawing.
      PubDate: 2021-03-03
       
  • One-Dimensional Compression Creep Characteristics of Light Weight Soil
           Mixed with Weihe River Mud and EPS Particles
    • Abstract: In order to reveal the creep laws of light weight soil, the compression creep characteristics of light weight soil mixed with Weihe River mud and EPS (expanded polystyrene) particles are researched by one-dimensional compression creep tests. The results show that the cementation structure strength of light weight soil becomes larger, and the creep deformation under the same load becomes smaller with the increasing of cement content and the decreasing of EPS particles content. For the same mixed ratio of light weight soil, when the load is larger, the deformation is greater, but the time of the deformation reaches the steady stage is shorter. With the increasing of the time, the deformation is increasing, finally it tends to be a stable value. There is no sharp creep stage, the deformation is attenuated creep. Light weight soil is a kind of structural soil, and it has a certain compression yield stress. When the load acting on the specimen is less than the compression yield stress of light weight soil, its cementation structure may still be intact, but the deformation is mainly due to the discharge of pore water and the movement of solid particles, and therefore deformation is small. When the load is greater than the compression yield stress of light weight soil, the cementation structure might have been collapsed, there is larger deformation for the EPS particles under pressure, the deformation of the samples is mainly the plastic deformation of the EPS particles, and therefore deformation is large. In the practice, the load should be controlled within the compression yield stress of light weight soil. According to the results, a power function empirical creep model is set up. Compared the test data with the model calculation data, it is found that when the axial load is less than the compression yield stress, the model can exactly reflect the creep laws of light weight soil in a certain time scale (e.g. 50 years), and it can provide a theoretical basis for the practical engineering.
      PubDate: 2021-03-02
       
  • An Elastic Solution for Twin Circular Tunnels’ Stress in Hydrostatic
           Stress Field
    • Abstract: In order to present an elastic solution for twin circular tunnels’ stress distribution in hydrostatic stress field, based on the complex variable theory and the superposition principle, the stress field of twin tunnels under static hydraulic pressure is decomposed into two parts: the original stress field and the secondary stress field. According to the symmetry of the structural form and the load distribution, the secondary stress filed can be simplifyed into a half-plane model. Therefore, the stress filed can be analyzed with the complex variable theory conveniently. Finally, the elastic solution of the twin tunnels under static hydraulic pressure is demonstrated by the superposition of the original stress field and the secondary stress field. In order to verify the analytical solution, a finite element model is adopted as the comparative test.. The result of the finite element simulation shows that the stress concentration at the middle rock wall is most obvious. And the stress concentration factor keeps increasing when the twin tunnels’ spacing distance and supporting pressure are decreasing. Besides, the maximum tangential stress appears at the tunnel boundary. The farther away from the tunnel’s boundary, the tangential stress gets lower. Furthermore, the supporting pressure leads to the increasing of radial stress and the decreasing of tangential stress. The analytical results are highly consistent with the numerical results with finite element method.
      PubDate: 2021-03-02
       
  • Observational Procedure for the Prediction of Ultimate Swell
    • Abstract: Montmorillonitic soils pose problems in the field as they are capable of exhibiting appreciable swelling when come in contact with water. In this context, prediction of amount of swell of such field soils gains importance. There are many approaches documented in the geotechnical engineering literature to predict the ultimate swell values. In the present work, a method of predicting the ultimate swell of the soils namely ‘observational procedure’ based on the procedure proposed by Asaoka for the analysis of consolidation data is developed and proposed. It is shown through exhaustive experimental data that the proposed method predicts the ultimate swell of soils quite satisfactorily.
      PubDate: 2021-03-02
       
  • A Critical Re-Examination of the Factors Influencing Determination of
           Organic Matter in Soils
    • Abstract: Organic matter is an undesirable constituent of the soil. Soils containing organic matter are associated with significant secondary compression and unsatisfactory strength characteristics. The estimation of organic matter in soils is hence a topic of concern for geotechnical engineers. The routine estimation of organic matter is carried out using the loss on ignition method put forward by ASTM and BS codes. The bureau of Indian standards has laid down the method for determining the organic matter present in soils, by the chromic oxidation equivalent of soil organic matter. This method is usually ignored due to the recovery of hazardous chromium whose disposal is dangerous to the environment. However, loss on ignition method also involves serious limitations like uncertainty in ignition time and temperature. This paper presents the results of the study conducted to identify various factors affecting the determination of organic matter using codal procedures. Tests were carried out on artificially prepared organic soils, prepared by mixing kaolinite, bentonite and sand with predetermined percentages of starch. Results have shown that IS code and BS code method I can be adopted when organic content in soils is less than 10%, and sample size is limited to 0.5 g. The loss on ignition method is the most reliable method with an optimum ignition time of 4 h and ignition temperature of 450 °C. The results of analyses performed on artificially prepared organic soils provide an insight into the selection of best method for determining organic matter in soils through an improved scientific perspective.
      PubDate: 2021-03-02
       
  • A Review to Develop new Correlations for Geotechnical Properties of
           Organic Soils
    • Abstract: Organic soils are considered one of the most problematic soils due to their high compressibility and low shear strength at small strains. Characterizing organic soils based on their simple index properties is useful for the preliminary design stages of construction projects. There are three main index properties used for assessing organic soils properties, namely: the water content, the organic content, and the fiber content. Organic soils are distinguished by their relatively high water content. The organic content includes the carbonaceous and combustible components. Whereas the fiber content accounts for the presence of fibers in organic soils based on their botanical composition and the degree of decomposition. The data available in literature regarding organic soils parameters (index, compressibility and shear strength) were collected and analyzed in this study to obtain new correlations between the different organic soil parameters, and the simple index parameters (water content and organic content). The available correlations found in the literature depend on relating a certain parameter with either the organic content or water content. However, the organic content and the water content are related. Hence, the proposed correlations presented in this study aim to connect the particular soil parameter with both the water content and the organic content, using the same equation. Unfortunately, there is not much data in the literature about the soil texture or fiber content, and their relation with other parameters. Hence, all the proposed correlations in this study are not considering the fibre content or the soil fabric.
      PubDate: 2021-03-01
       
  • Obtaining Suction Distribution Within Vadose Zone of Highway Pavement
           System in Southwestern Nigeria Using Physico-Empirical Approach
    • Abstract: The stability of the pavement system on old Ogbomoso-Ilorin road in southwestern Nigeria basement complex was investigated. This was carried out by estimating the suction, degree of saturation and effective stress of the soils within vadose zone from soil–water characteristic curve (SWCC) and suction stress characteristic curves (SSCCs) employing physico-empirical approach. For this purpo se, the grain-size distribution (GSD) curves of forty two disturbed soil samples, scooped from borings at anomalously low resistivity points delineated by 2-D Electrical resistivity imaging were fitted using empirical equation. Permeability and Atterberg limits tests were also carried out for engineering classification of the subsoil. The GSD curves indicated the soils are uniformly-, poorly- and gap-graded. The permeability of the soils ranged within 1.13 × 10–6 − 9.35 × 10–5 m/s suggests very fine sands, silts/clay-silt laminate of poor sub-drainage. The intermediate suction range values obtained from SWCCs were less than 150 kPa indicate matric suction. The soils suction; 1.053–79.529 kPa, varied with air entry values; computed (1.350–3.907 kPa) and estimated (0.406–3.672 kPa), indicating the soils could shrink. The high suction gradient; 0.223–12.403%/kPa, indicates decreased evaporation flux, the ability of the soils to generate flow and suggests the soils are deformable. The SSCCs indicated the degree of saturation at which minimal soils deformation could occur varied between 0.230 and 0.560 with maximum suction stress of 1.9–8.0 kPa. The presumed equilibrium suction of the area within the range 17.365–79.529 kPa was relatively high compared with suctions of all other soils. This indicates decreasing suction and hence significance shrinkage of the soils. The pavement materials properties would therefore have undergone significant volume change and impaired the stability of the pavement.
      PubDate: 2021-03-01
       
  • The P-y Response of Laterally Loaded Flexible Piles in Residual Soil
    • Abstract: This paper describes the main features related to lateral displacements with depth after successive lateral loading–unloading cycles applied to the top of reinforced-concrete flexible bored piles embedded in naturally bonded residual soil. The bored piles under study have a cylindrical shape, with 0.40-m in diameter and 8.0-m in length. Both bored piles types (P1 and P2) include an embedded steel pipe section in their center as longitudinal steel reinforcements: pile type P1 has another 16 steel rods as steel reinforcement to concrete while pile type P2 has no further steel reinforcement. Pile type P1 has three times as much stiffness (EI) and four and a half times the plastic moment (My) than pile type P2. A similar load–displacement performance was observed at initial loads as for small displacements of both piles. At this initial loading stage, the response of the reinforced concrete piles is a function of the soil characteristics and of a linear elastic pile deformation. During this stage, piles can even be understood as probes for evaluating soil reactions. For larger horizontal displacements, after the concrete section starts undergoing large deformations, approaching the ultimate bending moment, pile behavior and consequently the load–displacement relation starts to diverge for both piles. For pile P1 the values of relevant lateral displacements are extended to about 2.5-m in depth, while for pile P2 lateral displacements are mostly constrained to about 2.0-m in depth. Measurements of horizontal displacements of pile P1 against depth recorded with a slope indicator show that, after unloading, lateral loads at distinct stages (small and near failure loads), exhibits a much higher elastic phase of the system response. An analytical fitting model of soil reaction is proposed based on the measured displacements from slope indicator. The integration of a continuous model proposed for the soil reaction agrees fairly well with the measured displacements up to moments close to plastic limit. Results of load–displacement show that the stiffer pile (P1) was able to mobilize twice as much lateral load compared to pile P2 for a service limit displacement of about 20 mm. The paper shows results that enable the isolation of the structural variable through real scale pile load tests, thus granting understanding of its importance and enabling its quantitative visualization in examples of piles embedded in residual soil sites.
      PubDate: 2021-02-27
       
  • Closed-Form Solution of Critical Inclination for Rock Slope with Weak
           Plane
    • Abstract: Plane failure of rock slope is highly related to the inclination of the weak plane. The inclination of the weak plane is a general function of factors including: height of slope, factor of safety, horizontal coefficient of earthquake influence, inclination of slope, unit weight of rockmass, cohesion and friction angle on the plane. The closed-form solution of the critical inclination of the weak plane corresponding respectively is derived under two conditions (i.e., without earthquake and with earthquake), because the critical height of slope and the critical factor of safety are considered to and are easy to be adjusted in engineering practice. In the end, the relations between derived critical closed-form solution and each parameter are illustrated with an example.
      PubDate: 2021-02-27
       
  • Investigation on the Performance of Pipe Roof Method Adjacent to the
           Underground Construction
    • Abstract: In this paper, the behaviour of the pipe roof method with different pipe roofs disposition schemes including the pipe roof gate system and L-shaped system is discussed in terms of ground settlement reduction in the condition of underground space construction adjacent to the existing structure by using numerical simulation method. Considering the construction sequences of parallel underground tunnels with rectangular cross sections, the appropriate parameters and ground response characteristics of the corresponding pipe roof methods are evaluated by the ground surface displacement. The results indicated that the construction impacts from new buildings can be reduced by the pipe roof method. However, the theoretical performance of pipe roofs is highly dependent on the spacing between two structures. Generally, the L-shaped system is more effective in case of the distance (D) that is less than or equal to 1/2 width of box culvert (R) under the condition of a new structure constructed nearby the existing building. When two structures are constructed simultaneously, the excavation and the construction of structures influence each other reciprocally. The conclusions could provide a reference for the pipe roof method with the application scenario of adjacent building protection.
      PubDate: 2021-02-27
       
  • Slope Stability Analysis Using Rf, Gbm, Cart, Bt and Xgboost
    • Abstract: Slopes in geotechnical and mining engineering are the most crucial geo-structure. Predicting or forecasting the stability or instability of the slope and then classifying the slope accordingly helps in mitigating the risks and enhancing the design by maximizing the safety. Computing techniques have overpowered the analytical and statistical models used for predicting the stability of the slopes. To reduce the uncertainties and ambiguity of the previously used models, lately, researchers have come up with the novel techniques for Slope Stability Classification (SSC) which are Random Forest, Gradient Boosting Machine, Extreme Gradient Boosting, Boosted Trees and Classification and Regression Trees. These computational algorithms are employed in this research paper and the slope details are taken from a literature i.e. 221 input datasets are used and slopes are classified accordingly using the mentioned models. The relation between the inputs such as height (H), slope angle (β), cohesion (c), pore water pressure ratio (ru), unit weight (γ), angle of internal friction (φ) and slope stability (output) is established and slopes are categorized according to their failure and stability. Performance analysis is done thereafter to analyses and compare different models and let the readers and researchers know that which model sufficed and fitted best to the study.
      PubDate: 2021-02-27
       
  • Influence of Internal Friction Angle and Interface Roughness on Shear
           Behavior of Mortar-Rock Binary Medium Joint
    • Abstract: The damage of the interface between mortar and rock often occurs in engineering projects. The stability of the binary medium joint is the key factor in judging the stability of a hydraulic structure foundation. The shear characteristics of the flat mortar-rock joint were numerically simulated under the direct shear test by finite element using FLAC3D software. The results showed that the internal friction angle of mortar has little influence on the shear strength, its corresponding displacement, strain softening degree and residual shear strength for flat joint. Therefore, considering the roughness of the structural surface, the joint with regular serrated mortar-rock binary medium was established in this paper, and the direct shear test under the condition of constant normal stress was carried out for comparative study. The results showed that the shear strength, residual strength, peak strength displacement and strain softening degree of the serrated structure were strongly correlated with the internal friction angle of mortar. For the regular serrated binary joint, improving the mortar performance can improve the shear performance and stability of the whole structure more effectively than the flat joint. The relationship between the shear strength, residual strength and the friction angle were established respectively.
      PubDate: 2021-02-27
       
  • The Wall Behaviour in the Contiguous Drilled Piles Reinforced by Anchors
           in 3D the “case study” of Ain-Naadja Metro Station–(Algiers)
    • Abstract: Soil reinforcement includes a set of techniques in order to improve its mechanical or physical properties, by the establishment of inclusions working on traction, compression or bending. Among these techniques are nailing, tie rods, micro piles, bored piles, ballasted columns. Slope stability can be improved with different ways using soil improvement techniques or by installing supporting structures such as retaining walls or piles. The first solution leads to the reduction of forces that cause sliding; the other solutions generally lead to the increase of resistance forces. The present work is concerned with the sensitivity of the deformations of contiguous drilled pile walls reinforced by tie rods associated with the models of soil behaviour. The analysis is done on the metro station of Algiers Line 1, Extension C-Hai el Badr-Ain-Naadja (station of Ain-Naadja). The obtained results by a numerical simulation in 3D, deformations at the level of the piles or displacements, as well as the efforts of extensions at the level of the tie rods are compared with the measurements in situ taken in very particular points either at the level of the tie rods or by inclinometers at the level of the piles.
      PubDate: 2021-02-25
       
  • Mechanism of Overlying Crack-Stress Evolution When Mining on the Dual
           Fault Zone
    • Abstract: To study the fissure-stress evolution law of overburden rock in the process of working face advancing in the dual fault area. This paper took the geological occurrence condition and actual mining situation of working face 21,129 of Tucheng mine as the engineering background. The method of similarity simulation combined with field measurement was adopted. The evolution law of the stope fissure field, the stress variation trend of roof fault, and migration characteristics of overlying strata in the process of stope mining through dual faults were studied. The results showed that: Dual faults had a large effective area on the surrounding rock of the stope, the surrounding rock movement in the affected area was intense. When the working face advanced to the fault F2 area, the energy generated during the surrounding rock movement of the fault F2 was transferred to the fault F1, which intensified the activity of the rock in the fault F1 area. The activation of the fault F2 caused the fissures in the surrounding rocks of the fault F1 to expand further. The surrounding rock of the stope changed from a single-fault action mode to a double-fault joint action mode. According to the degree of development of cracks in the roof of the overlying strata, the stope’s different positions were sorted from large to small as follows: fault activated fracture zone > central dual fault zone > open-off cut zone > middle of the non-fault affected zone. The field measured data showed that the area affected by the dual fault was composed of “high-pressure area” and “low-pressure area.” The working resistance value of hydraulic support was higher than that of the non-fault affected area. The law of fracture development and distribution in overlying strata of stope in similarity simulation experiments were consistent with the law of roof pressure measured in the field.
      PubDate: 2021-02-25
       
 
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