Subjects -> MINES AND MINING INDUSTRY (Total: 82 journals)
Showing 1 - 42 of 42 Journals sorted by number of followers
Stainless Steel World     Full-text available via subscription   (Followers: 18)
Journal of Applied Geophysics     Hybrid Journal   (Followers: 16)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
International Journal of Hospitality & Tourism Administration     Hybrid Journal   (Followers: 14)
European Journal of Mineralogy     Hybrid Journal   (Followers: 12)
Journal of Geology and Mining Research     Open Access   (Followers: 11)
Contributions to Mineralogy and Petrology     Hybrid Journal   (Followers: 11)
Mineral Processing and Extractive Metallurgy : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 11)
Transactions of Nonferrous Metals Society of China     Hybrid Journal   (Followers: 10)
Journal of Human Resources in Hospitality & Tourism     Hybrid Journal   (Followers: 9)
Clay Minerals     Hybrid Journal   (Followers: 9)
Minerals Engineering     Hybrid Journal   (Followers: 9)
Lithos     Hybrid Journal   (Followers: 9)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 9)
Natural Resources Research     Hybrid Journal   (Followers: 8)
Geotechnical and Geological Engineering     Hybrid Journal   (Followers: 8)
Rock Mechanics and Rock Engineering     Hybrid Journal   (Followers: 7)
International Journal of Rock Mechanics and Mining Sciences     Hybrid Journal   (Followers: 6)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
International Journal of Mining Engineering and Mineral Processing     Open Access   (Followers: 5)
Journal of Quality Assurance in Hospitality & Tourism     Hybrid Journal   (Followers: 5)
Mine Water and the Environment     Hybrid Journal   (Followers: 5)
International Journal of Mining and Mineral Engineering     Hybrid Journal   (Followers: 5)
Journal of the Southern African Institute of Mining and Metallurgy     Open Access   (Followers: 5)
Mining Engineering     Full-text available via subscription   (Followers: 5)
Resources Policy     Hybrid Journal   (Followers: 4)
International Journal of Mining Science and Technology     Open Access   (Followers: 4)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Mineral Processing and Extractive Metallurgy Review     Hybrid Journal   (Followers: 4)
Applied Earth Science : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 4)
International Journal of Mining, Reclamation and Environment     Hybrid Journal   (Followers: 4)
International Journal of Coal Geology     Hybrid Journal   (Followers: 4)
Physics and Chemistry of Minerals     Hybrid Journal   (Followers: 4)
Journal of Convention & Event Tourism     Hybrid Journal   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Journal of Sustainable Mining     Open Access   (Followers: 3)
International Journal of Coal Science & Technology     Open Access   (Followers: 3)
Mining Journal     Full-text available via subscription   (Followers: 3)
Ghana Mining Journal     Full-text available via subscription   (Followers: 3)
Geology of Ore Deposits     Hybrid Journal   (Followers: 3)
Rocks & Minerals     Hybrid Journal   (Followers: 3)
Environmental Geochemistry and Health     Hybrid Journal   (Followers: 2)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Geomaterials     Open Access   (Followers: 2)
Mineralogia     Open Access   (Followers: 2)
BHM Berg- und Hüttenmännische Monatshefte     Hybrid Journal   (Followers: 2)
Mining Technology : Transactions of the Institutions of Mining and Metallurgy     Hybrid Journal   (Followers: 2)
Extractive Industries and Society     Hybrid Journal   (Followers: 2)
International Journal of Coal Preparation and Utilization     Hybrid Journal   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Mining Report     Hybrid Journal   (Followers: 2)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 2)
Archives of Mining Sciences     Open Access   (Followers: 2)
Journal of Materials Research and Technology     Open Access   (Followers: 2)
Gems & Gemology     Full-text available via subscription   (Followers: 1)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access   (Followers: 1)
Rangeland Journal     Hybrid Journal   (Followers: 1)
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access   (Followers: 1)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Mineralogical Magazine     Hybrid Journal   (Followers: 1)
CIM Journal     Hybrid Journal  
Natural Resources & Engineering     Hybrid Journal  
Mining, Metallurgy & Exploration     Hybrid Journal  
Podzemni Radovi     Open Access  
Rudarsko-geološko-naftni Zbornik     Open Access  
Journal of Mining Institute     Open Access  
International Journal of Mining and Geo-Engineering     Open Access  
Journal of China Coal Society     Open Access  
Réalités industrielles     Full-text available via subscription  
Mineral Economics     Hybrid Journal  
Minerals     Open Access  
Gold Bulletin     Hybrid Journal  
Minerals & Energy - Raw Materials Report     Hybrid Journal  
Similar Journals
Journal Cover
Geotechnical and Geological Engineering
Journal Prestige (SJR): 0.611
Citation Impact (citeScore): 1
Number of Followers: 8  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0960-3182 - ISSN (Online) 1573-1529
Published by Springer-Verlag Homepage  [2469 journals]
  • Geological and Geotechnical Characterization of Soils from the Barreiras
           Formation in a Subarea of Study in Maceio, Alagoas State, Brazil

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      Abstract: Abstract The Barreiras Formation comprises approximately 75% of the urban area of Maceio-Alagoas, which has a vast number of steep densely occupied slopes, located in embedded valleys called “grotas” where erosive processes cause a high risk of landslides. Despite the homogeneity of the local geology, the Barreiras Formation still presents few studies that provide geological/geotechnical information, and it is under these perspectives that this article is developed, part of a research carried out by the Federal University of Pernambuco through the Geotechnical Engineering Group for Slopes, Plains and Disasters. The geological/geotechnical characterization was carried out through the construction of a database with 474 SPT boreholes, located in a subarea of study in the city of Maceio, where it was possible to carry out a geostatistical evaluation of the penetration resistance values (Nspt) using the ordinary kriging method and the establishment of engineering geological units. A geotechnical detail study was carried out on a slope (Grota da Moenda) inserted in the studied subarea, which involved field investigations by means of the execution of SPT borehole and collection of undisturbed samples, while laboratory investigations provided information regarding the physical and mechanics of the soil through permeability (Tri-flex) tests, suction, double oedometer, direct shear and triaxial CID tests. The geotechnical parameters obtained in this research together with the probabilistic maps are of great importance in learning about the behavior of the soils in the investigated place, presenting initial parameters that could help in several engineering projects.
      PubDate: 2022-08-11
       
  • Correction to: A Size-Dependent Bonded-Particle Model for Transversely
           Isotropic Rock and its Application in Studying the Size Effect of Shale

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      PubDate: 2022-08-10
       
  • Geopolymer Materials for Low-Pressure Injections in Coarse Grained Soil:
           Multiscale Approach to the Study of the Mechanical Behaviour and
           Environmental Impact

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      Abstract: Abstract The term soil improvement is commonly referred to the modification of soil structure in order to obtain a material with better physical and mechanical properties such as strength, stiffness or permeability. With this purpose, one of the most commonly used applications, particularly in coarse-grained soils, is the low pressure injection of cementitious mixtures. In recent years, there has been a growing demand for solutions with limited environmental impact and limited CO2 emissions and, in this regard, the cement present in the injected grout is evidently the weak point of traditional solutions. In this work, the experimental study of geopolymer materials as a substitute of cement mixture for low-pressure injection for coarse-grained soils improvement is presented. The study started with a focus on the geopolymer fresh mixture properties (density, viscosity, …) and the evolution over the time of the mechanical properties (compression and tensile strength and stiffness) comparing three different mix designs at three different monitoring temperatures. The same evaluations were repeated on sand samples injected with the different types of mixtures previously analyzed. For a selected mix design, a permeation test was carried out under controlled conditions to test the pumpability and effectiveness of geopolymer injection. Finally, to deepen the chemical interaction between the injected mixture and interstitial water, an injection test was carried out using a scaled model of a real injection system. The experimental study carried out was aimed both at the analysis of the characteristics of the geopolymer material and at its physical interaction with coarse-grained soil, passing through the measurement of the mechanical characteristics of the geopolymer material and of the solid sand skeleton mixed with geopolymers. Finally, the possible chemical interaction of the mixtures with groundwater was also evaluated in order to highlight any environmental issues. The results shown provide a preliminary but sufficiently broad picture of the behavior of geopolymer mixtures for low-pressure injection for coarse-grained soil improvement purposes both from physical–mechanical and chemical points of view.
      PubDate: 2022-08-10
       
  • Index Property to Characterize the Proportion of Primary Minerals
           Transforming to Clay Residues During Expansive Soil Formation

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      Abstract: Abstract Disintegration and decomposition of sedimentary materials and igneous/metamorphic rocks in arid and semi-arid plateaus form expansive soils. The parent materials of expansive soils are 5.3 million years (basic igneous rocks) to > 570 million years (basement complex rocks) old. Developing an index property to estimate the fraction of primary minerals that decompose to clay is important as expansive clays drive their moisture-related volume changes. Data of 119 expansive soils from Nigeria, Tanzania, Ethiopia, Sudan, India, Australia, Oman, Chad Basin, Morocco, Kenya, and Zambia are analyzed to develop an index property termed decomposition ratio (Dr) to quantify the fraction of primary minerals that decompose into expansive clay. The sand+silt fractions represent the undecomposed primary mineral content, while the clay fraction represents the fraction of primary minerals that decomposed completely. Expansive soils from India, Sudan and Tanzania are characterized by median Dr values of 0.52–0.74; expansive soils from Ethiopia, Nigeria, Australia, Ghana, Chad Basin, Morocco, Zambia, and Kenya are characterized by median Dr values of 1.02–1.43. Dr values < unity imply that < 50% of primary minerals have decomposed into clay. Analysis of Dr data indicated that clay formation tends towards equilibrium when weathering of parent material depletes their primary mineral contents to 35%. Normalizing liquid limit with Dr regulates variations in liquid limit of expansive soils with similar clay content but formed under different conditions.
      PubDate: 2022-08-10
       
  • Determining the reasonable pillar width and surrounding rock control based
           on goaf compaction

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      Abstract: Abstract The stress distribution and deformation of roadway surrounding rock at different pillar widths are investigated through theoretical calculation, numerical simulation and field monitoring, taking into account goaf compaction. The purpose is to determine the best width and the stress evolution of the reserved roadway protective coal pillar in fully mechanized working faces. The results show that when the gangue in the goaf is slowly compacted, its stress will recover and the gangue will take over part of the overburden load. This will result in a reduction in the bearing pressure inside the surrounding rock. The stress recovery of the fallen gangue in the goaf center will peak and diffuse to the goaf edge in a decreasing manner. As the pillar width increases, the concentrated stress of the pillar will change from unimodal to bimodal. The bearing capacity will gradually increase. The peak stress and plastic failure area of the roadway solid coal wall will gradually reduce. Taking into account pillar stability, resource recovery and the need to prevent gas in the goaf from coming into the mining roadway, we recommend setting the pillar width in coal 3#, the protective layer, to 10 m. The mine replaced the original bolt-cable roof support scheme with a full-cable plus local grouting technique. Field practice indicates a displacement of 39, 20, 32, and 23 mm for the roadway roof, floor, pillar wall, and solid coal wall. The overall roadway deformation is well controlled, validating our numerical simulation result.
      PubDate: 2022-08-09
       
  • Inverse Analysis of Subgrade Reaction Coefficient of Subway Based on
           Computer Neural Network

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      Abstract: Abstract This study analyzed the value of the coefficient of the subgrade reaction in different soil layers to improve the convenience and accuracy of determining the coefficient of the subgrade reaction of typical rock and soil in the Shijiazhuang area. For this analysis, we relied on the actual project of the deep foundation pit drainage section of the Dongli Station of the Shijiazhuang Metro Line 3, organized and analyzed the monitoring data obtained in the actual construction process, and discussed the deformation law of the foundation pit. The learning and training samples of the back-propagation neural network were established using an orthogonal experimental design method and the FLAC3D numerical simulation software. An inverse analysis of the rock elastic modulus E and coefficient of the subgrade reaction K in this area was conducted. The results of the inversion analysis of the coefficient of the subgrade reaction of typical geotechnical strata in the Shijiazhuang area were in good agreement with the normative values and experimental reference values in the survey and design data. These results were for the loess-like silty clay and silty clay in the Shijiazhuang stratum. The representative soil layer was modified using the corresponding theoretical formula, and the corresponding theoretical calculation reference formula was obtained.
      PubDate: 2022-08-09
       
  • Small Block Model Tests for the Behaviour of a Blocky Rock Mass Under a
           Concentrated Rock Anchor Load

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      Abstract: Abstract Rock anchors are used to stabilise large-scale infrastructure such as the foundations of high buildings or road cuts, and their failure could lead to severe economic and social consequences. A rock anchor can fail in one or more of the following four modes; breakage of the tendon steel, tendon-grout bond failure, grout-rock bond failure and rock mass failure. In current rock anchor design, the knowledge for the first two failure modes is satisfactorily known and is relatively easy to test. The scientific background for the last two failure modes still has a potential of improvement and further development of the design criteria is needed. To help fill this gap, a series of block model tests were conducted on a small-scale test apparatus to evaluate the load capacity of a blocky mass under a rock anchor load. Digital image correlation (DIC) was used to monitor the full-field displacements in the block models. The tests showed that load arches were formed in the block layers and the anchor load was transferred to the side frames of the apparatus through these arches. The load capacity of the mass increased with the number of the block layers and the confinement. The observed load arches and the effect of the confinement were also captured in a numerical model using UDEC software. The DIC monitoring showed that the displacements in the block model were identical along a vertical line. At a given depth, the displacements decrease with the distance to the centre line of the anchor.
      PubDate: 2022-08-06
       
  • Effect of Strain Rate on Mechanical Properties and AE Characteristics of
           Hard Rock Under the Impact of Uniaxial Compression

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      Abstract: Abstract To study the effect of strain rate on mechanical response, energy mechanism, damage mode and AE characteristics of granite rock, the uniaxial compression tests under different loading strain rates were carried out. The results showed that the higher the loading strain rate was, the greater the threshold stress and threshold energy were. There exists a good logarithmic relationship between the threshold stress, threshold energy and the loading strain rate. When the strain rate was low, the shear failure occurred in the granite sample with a large number of cuttings were generated; under the condition of high strain rate, the granite specimen occurred tensile failure, and the specimen was completely destroyed. Besides, for the low loading strain rate, the damage of the granite sample was developed, the acoustic emission signal increased continuously, and the cumulated number of AE ringing counts was continuously increased; on the contrary, for the high loading strain rate, the number of AE ringing counts was small and firstly increased stepwise, and sharply increased to the maximum value.
      PubDate: 2022-08-03
       
  • A Multiscale Investigation of the Effects of Water on Grain Crushing

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      Abstract: Abstract The mechanical behavior of a granular medium is closely related to its saturation state. One of the underlying phenomena controlling this dependence is particle breakage. In the presence of water, the strength of a particle is weakened through various physical–chemical processes, which lead to an increase in the intensity of particle crushing. The acceleration of the particles fracturing results in the distinctive mechanical response usually observed in unsaturated soils. A multiscale experimental study was conducted to establish a causal relationship between the change of saturation and the increased breakage rate. Oedometric tests were used to understand the effects of saturation on the mechanics of the granular packing, while crushing and wedge splitting tests help appreciate the micromechanical origins of this typical behavior.
      PubDate: 2022-08-02
       
  • Correction to: Numerical Analysis of Infiltration in One‑Dimensional
           Unsaturated Soil–Geotextile Column

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      PubDate: 2022-08-01
       
  • Directional Support Method for Tunnel Jointed Rock Mass

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      Abstract: Abstract In order to explore the directional support method of jointed rock mass and ensure the stable operation of roadway, the support effect of jointed rock mass was analyzed by numerical simulation and on-site monitoring. The results showed that directional support could effectively reduce the deformation and ensured the stability of surrounding rock. In the process of directional reinforcement support construction, the plane formed by multiple bolts was guaranteed to be perpendicular to the structural plane, and the bolt hole extended along the normal plane of roadway, the control effect of this support mode was the best. The stress change law of surrounding rock of roadway was monitored by using borehole force meter. The results showed that the stress released occurs in surrounding rock of roadway after excavation, and the cumulative stress change value did not increase 5 to 7 days after excavation. The jointed rock mass remained in a stable state under the action of directional reinforcement support. The directional reinforcement of roadway surrounding rock had a good control effect on roadway stability.
      PubDate: 2022-08-01
       
  • AE and Damage Characteristics of Coal with Different Water Soaked Depths
           Under Uniaxial Compression

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      Abstract: Abstract The stability of remnant coal pillars is of great significance for safe mining of coal resources around them. The remnant coal pillars are often soaked in mine water with a certain height. Different water levels (or depths) may affect the stability of remnant coal pillar differently. In this paper, uniaxial compression tests were carried out on coal specimens with different water soaked depths. Deformation and damage characteristics of coal specimens under loading were analyzed through acoustic emission (AE) and digital image correlation techniques. The results show that the AE energy curve of each partially soaked coal specimens presents double peak, while that of fully soaked coal specimen has only single peak. As the soaked depth increases, the AE b value gradually decreases, which indicates that the micro-fracture of coal specimens decrease with the increase of water soaked depth. During deformation and damage, partially soaked coal specimens have obvious localized strain, and the local strain concentration area is basically distributed in the dry–wet transition area. While the surface of the fully soaked coal specimen presents relatively uniform deformation. Partially distributed water within coal matrix increases the heterogeneity of the coal specimens. These results reveal the deformation and damage characteristics of coal with different water soaked depths, and provide a useful reference for reasonably evaluating the stability of coal pillars.
      PubDate: 2022-08-01
       
  • Experimental Study on the Rheological Shear Mechanical Behavior of Bolted
           Joints

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      Abstract: Abstract Landslides, which are predominantly caused by the rheological behavior of preexisting joints, occur frequently around the world and are among the most catastrophic disasters. However, most researchers have rarely considered the rheological characteristics of bolted rock joints. In this study, based on rock-like materials, rheological direct shear tests of joints with and without anchor bolts were carried out, and direct shear tests were conducted for comparison. The results showed that under direct shear conditions, with the presence of bolts, less spalling and failure of the rock mass occurs, and the shear strength of the joints was significantly enhanced. Under rheological direct shear conditions, joints with bolts have more total rheological shear displacement, but the effect of the bolt on the shear displacement of the steady creep stage was not obvious, and the shear stiffness of the rock mass was reduced by the coupling effect between the bolt and joint. Using the Mohr–Coulomb criterion for further analysis, we found that during the rheological process, the reinforcement of bolts mainly focuses on cohesion, while under direct shear conditions, the reinforcement of bolts is mainly reflected in the internal friction angle. This study is expected to provide theoretical guidance for landslide control and protection and to further reduce the occurrence frequency of geohazards. This research is expected to provide theoretical guidance for the prediction and prevention of geological disasters.
      PubDate: 2022-08-01
       
  • Study on the Optimization of Support Parameters of Metro Station
           Constructed by Arch Cover Method

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      Abstract: Abstract The arch is the main stress structure of metro station in the construction of arch cover method. The preliminary geological survey has some limitations, and the arch structure design based on the survey results is usually too conservative, which increases the investment cost. Therefore, it is necessary to optimize the design parameters of arch structure. In this paper, based on particle swarm optimization (PSO) algorithm, the engineering cost is taken as the optimization objective, and the monitoring control values of displacement are taken as the constraint condition. The scheme optimization is carried out for the thickness of outer primary lining and inner primary lining and removal length of temporary support. The final optimization values of parameters obtained by PSO algorithm are that the removal length of temporary support is 18 m, the thickness of the outer primary lining is 22 cm, and the thickness of the inner primary lining is 26 cm. Compared with the original design scheme, the engineering cost of the optimized scheme is reduced by 8.79%. The optimized parameters can not only meet the safety requirements of the project, but also effectively reduce the project cost, which has guiding significance to the actual project construction.
      PubDate: 2022-08-01
       
  • Embankment Dam Design with Dispersive Soil: Solutions and Challenges

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      Abstract: Abstract The configuration and safety factor of rockfill dams design depend on materials used in construction of the dam. In some regions, the available materials for using as impermeable element of the dam body are dispersive and it is inevitable to consider the dispersivity of the material in the design and construction. Internal erosion through cracks or other openings in the embankment is the most concern of using the dispersive soils. The authors have designed an embankment dam by using dispersive soil in East Africa after finalizing the dispersivity of materials based on the required tests. The foundation of dam and borrow areas consisted of dispersive soil and the effective measures has been considered in the design to safely deal with dispersivity according to recommendation of the design codes. The selected solution was the combination of chimney filter, filter drain, and selective placement of materials in the dam body as the effective solution considering the specification of the project. More precautions in addition to general recommendation have been incorporated into the design criteria due to placing the project in high hazard category. The local instability in the contact zones was the concerns of designers and bilinear parameters has been considered in the stability analysis as the base case. A drainage layer was added into half of the length of filter blanket and the feature of the design was determined according to nonlinear static and dynamic analysis of the dam body. This paper presents the measures and precautions that were taken into account in dealing with dispersive soil in order to ensure the safety of design.
      PubDate: 2022-08-01
       
  • Experimental Study on Mechanical Properties of Fully Bonded Bolts with
           Varied Bond Length

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      Abstract: Abstract The fully bonded bolting method is widely applied in geotechnical engineering areas and is considered as an efficient approach due to its better loading capacity compared with end-anchored methods. However, the mechanical property of fully bonded bolt under various bond lengths is still unclear. This study comprises a mixed methodology of laboratorial experiments and theoretical analysis to discuss the mechanical law of fully bonded bolts under different bond lengths. Results show that the plastic debonding at the interface tends to expand as the bond length increases. Moreover, the undergoing time of the yield stage, which is between the initial and peak force stages, shows an increasing trend that is also applicable to the corresponding pull-out displacement. We have also identified that AE capturing indicated that intense energy events/values are easy to identify when the bond length increases, a phenomenon; that is closely related to the longer frictional process of the specimens with longer bond length. This study provides a reference for the design of fully bonded bolts, that is, the bond length should be carefully considered to avoid the premature failure of bolting systems due to progressive debonding.
      PubDate: 2022-08-01
       
  • Prediction of Water Inflow into Tunnel Crossing Intersecting Faults Based
           on IDB Seepage Model

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      Abstract: Abstract Water inrush accident into tunnel has become a bottleneck problem restricting the construction of deep-buried long tunnels, and the effect of intersecting faults on water inflow into tunnel is more complicated. Based on in-situ water pressure test data, the change law of the seepage characteristics in fault zone is analyzed, and an improved Darcy–Brinkman seepage model based on the theory of three-district zoning of faults is established. By assuming that the permeability coefficient conforms to the superposition principle, the underground seepage numerical model of intersecting faults that with perpendicular directions to tunnel is established. Then five calculation conditions are analyzed when the tunnel excavation axis is located at different relative height of the fault intersection center, so as to obtain the effect of the relative vertical location of the tunnel to the fault intersection center on the water pressure field, the seepage velocity field and the water inflow into tunnel. The results show that water inflow into tunnel crossing intersecting faults has litter relationship with the upper or lower position between the fault intersection center and the tunnel, but mainly depends on the relative height between them. The smaller the relative height, the smaller the water pressure, the greater the water inflow. Compared with the theoretical formula method and the stochastic mathematical method, the numerical simulation method can reflect the gradual process of water inrush while encountering intersecting faults in excavation and the change law of water inflow in different space and time under specific geological conditions, which is most consistent with the in-situ water inflow monitoring data.
      PubDate: 2022-08-01
       
  • On the Mechanism of Stress Superposition Inducing Outburst Under the
           Influence of Blind Fault Instability

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      Abstract: Abstract The mechanism for coal and gas outbursts in normal blind fault areas is not yet clear. Coal and gas outbursts induced by normal blind faults exposed at the 22,703 working face in the Yanjiao Coal Mine were taken as examples to carry out numerical simulation, detection and inversion through radar computed tomography (CT) transmission. In combination with ground pressure monitoring data before/after outbursts, the mechanism driving outbursts induced by superposition of multiple stresses and subjected to the influence of blind faults was primarily investigated in the present study. The results indicated that due to a cutting action applied by a blind fault on rock masses, the intersection of the fault plane and coal seam always remains in a stress concentration state as the working face advances. In addition to the impact of mining-induced abutment pressure, the intersection of the fault plane and coal seam is also under the actions of tectonic stress. Once the 22,703 working face arrives at a position 15 m away from the fault plane, coal masses between the working face and the fault plane are entirely damaged due to joint actions of abutment pressure and tectonic stress. In this case, the coal mass loses its carrying capacity entirely; the overlying strata of the working face settle sharply, and the strata behaviour of the working face becomes intense. Consequently, coal and gas outbursts are induced. In addition, according to ground pressure data before/after an outburst event at the face, a significant rise in local ground pressure monitoring data suggests coal rock instability. Prior to such an outburst, the operating resistance of the hydraulic support in a local region may increase by 300% compared with its normal value, which is an early warning index for a potential area of outburst. Therefore, not only do regions where the ground pressure rises abnormally need to be further explored but also the gas stress of the coal mass should be synchronously checked. In this way, prevention and control measures can be made in advance.
      PubDate: 2022-08-01
       
  • Numerical Analysis of Infiltration in One-Dimensional Unsaturated
           Soil–Geotextile Column

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      Abstract: Abstract Numerical modelling development for capillary barrier investigation considering unsaturated soil–geotextile interface has been studied and evaluated in recent years. Most engineering constructions involving geomaterials and geotextiles application, such as reinforced walls, slopes, embankments, and roads, require understanding the hydraulic performance of those systems for design purposes (capillary barrier, drainage, filtration, etc.). Considering that the hydraulic behavior of those materials is directly dependent on their saturated–unsaturated state over time, unsaturated principles should be applied for their long-term evaluation. This paper presents a 1D (one-dimensional) numerical analysis of an unsaturated system composed of soil and gravel layers separated by a geotextile in a column laterally impermeable (2.0 m). A non-woven geotextile was applied considering different soil types from the literature, such as silty sand, sandy, compacted residual silty, bimodal, and compacted residual sandy soils. A SEEP/W finite element numerical model was developed to perform transient analyses through the system to evaluate its hydraulic performance in terms of capillary barrier formation considering different geomaterials combinations in different hydraulic conditions. A significant influence of geotextile hydraulic conductivity and water flow rate were verified on the capillary barrier effect. Also noticed were the different height and duration of capillary barrier formation for different soil profiles. A design chart-table was proposed to evaluate soil–geotextile performance in terms of capillary barrier for new geotechnical designs. Finally, it could be inferred that fine-grained soils demonstrated to develop higher and longer water column (positive pore pressure) compared to coarse-grained soils, independently of their initial suction.
      PubDate: 2022-08-01
       
  • Earthquake Response of Ring Foundation in Cohesionless Soil

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      Abstract: Abstract Ring foundations are commonly adopted to support tall and heavy cylindrical structures such as silos, chimneys, cooling towers, circular storage tanks, and windmills. The construction of these structures in the earthquake-prone region poses a high risk due to the limited knowledge about their behavior under the earthquake loading when supported on a ring type of foundation. The present study focuses on analyzing the response of ring foundations resting on cohesionless soil during the event of an earthquake. A three-dimensional finite element numerical analysis was carried out to study the behavior of the ring foundation-silo system during the event of an earthquake. The variation in ring geometry such that the ratio of inner to the outer radius (Ri/Ro) was 0.2, 0.4, 0.6, and 0.8, soil densification (γ) under loose and dense condition, the height of silo (h) of 15 m (squat silo) and 25 m (slender silo) and the different earthquake loadings were considered to study their effect on peak acceleration and horizontal displacement of ring foundation. The input motions from 1979 El Centro, 2001 Bhuj, and 1989 Loma Prieta earthquake were considered for the dynamic analysis. The results indicated a decrease in the horizontal displacement of the ring foundation with an increase in height of the structure and soil densification. The foundation displacement was irrespective of the ring geometry for squat silo but showed variation with ring geometry for slender silo. The peak acceleration at the base of the ring foundation was observed to be increased with a rise in height of the structure and soil densification.
      PubDate: 2022-08-01
       
 
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