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- Excess pore water pressure (3)
- Shear strength (3)
- Bentonite (2)
- Bridge engineering (2)
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- Digital image correlation (2)
- Direct shear test (2)
- Discrete element method (2)
- Expansive soil (2)
- Foundation pit excavation (2)
- Freeze-thaw cycle (2)
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- Model test (2)
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- Permeability (2)
- Pile foundation (2)
- Rock mechanics (2)
- Seepage (2)
- Seismic response (2)
- Shaking table test (2)
- Shield tunnel (2)
- Skeleton void ratio (2)
- Structural plane (2)
- Unsaturated soil (2)
- 3D finite element (1)
Articles 31 - 60 of 99
Full-Text Articles in Civil and Environmental Engineering
Long-Term Stress Characteristics And Load Reduction Effect Of High-Fill Box Culverts With Eps Slabs, Qi Gao, Bao-Guo Chen, Sen Wu, Shan Yuan, Meng-Yao Sun
Long-Term Stress Characteristics And Load Reduction Effect Of High-Fill Box Culverts With Eps Slabs, Qi Gao, Bao-Guo Chen, Sen Wu, Shan Yuan, Meng-Yao Sun
Rock and Soil Mechanics
Laying expandable polystyrene (EPS) slabs on the top of high-fill box culverts to reduce earth pressure has been used in engineering practice, but the creep of EPS slabs will cause the earth pressure on the box culvert to change over time. The present design theory of box culverts cannot clearly reflect the long-term load reduction effect of EPS slabs and the long-term stress characteristics of box culverts. In this analysis, model tests were carried out to investigate the short-term stress characteristics of the box culvert with EPS slabs, and a numerical model was validated by the model test results. Then …
Simulation Of Seepage And Heat Transfer In 3d Fractured Rock Mass Based On Fracture Continuum Method, Dong-Dong Liu, Li-Xin Wei, Guo-Yuan Xu, Yan-Yong Xiang
Simulation Of Seepage And Heat Transfer In 3d Fractured Rock Mass Based On Fracture Continuum Method, Dong-Dong Liu, Li-Xin Wei, Guo-Yuan Xu, Yan-Yong Xiang
Rock and Soil Mechanics
The main challenge of simulating the processes of seepage and heat transfer in fractured rock mass is the heterogeneity of rock mass at various scales. In order to balance the efficiency and accuracy of numerical simulation, the two-dimensional fracture continuum method is extended to a three-dimensional one. Based on the depth-first search algorithm, the effective fractures contributing to the permeability of rock blocks are collected. The block permeability tensor is obtained by considering the contribution of effective fractures and rock matrix. The finite element software COMSOL Multiphysics is integrated with Matlab to generate a three-dimensional fracture continuum model that contains …
Mechanism Of Liquefaction-Induced Lateral Spreading In Liquefiable Inclined Sites, Ke-Min Jia, Cheng-Shun Xu, Xiu-Li Du, Xiao-Ling Zhang, Jia Song, Zhuo-Lin Su
Mechanism Of Liquefaction-Induced Lateral Spreading In Liquefiable Inclined Sites, Ke-Min Jia, Cheng-Shun Xu, Xiu-Li Du, Xiao-Ling Zhang, Jia Song, Zhuo-Lin Su
Rock and Soil Mechanics
A numerical model of the liquefaction horizontal free-field shaking table test was developed based on the completed large-scale shaking table test of liquefaction horizontal free field using the OpenSees finite element platform, and the numerical model was verified. Based on this, a free-field numerical model of the overall inclined foundation was established, and the non-cyclic dynamic response of the liquefaction lateral spreading site and the mechanism of liquefaction-induced lateral spreading were discussed. The results show that the established numerical model can effectively simulate the seismic response in liquefiable sites. There was significant relative displacement at the interface between liquefiable loose …
Roughness Characterization Of Rock Fracture And Its Influence On Fracture Seepage Characteristics, Lei Gan, Yu Liu, Zong-Liang Zhang, Zhen-Zhong Shen, Hong-Ying Ma
Roughness Characterization Of Rock Fracture And Its Influence On Fracture Seepage Characteristics, Lei Gan, Yu Liu, Zong-Liang Zhang, Zhen-Zhong Shen, Hong-Ying Ma
Rock and Soil Mechanics
Roughness of rock fracture has a significant influence on the seepage characteristics of fracture. The point cloud data of rock fracture surface was collected by three-dimensional (3D) optical scanning system. The joint roughness coefficient (JRC) and surface roughness ratio (Rs) were calculated by SURFER and GEOMAGIC STUDIO, and the quantitative relationship between JRC and Rs was established. The effects of JRC and Rs on the fracture seepage characteristics in limestone were investigated by conducting seepage tests under the coupling effect of stress, seepage and chemical interaction. The results show that JRC is a logarithmic function of Rs, with the R-squared …
Strength Deterioration Characteristics Of Lime-Metakaolin Improved Earthen Site Soil Under Freeze-Thaw Cycles, Xin-Ming Li, Hao-Yang Zhang, Di Wu, Yan-Rui Guo, Ke-Bin Ren, Yun-Zhi Tan
Strength Deterioration Characteristics Of Lime-Metakaolin Improved Earthen Site Soil Under Freeze-Thaw Cycles, Xin-Ming Li, Hao-Yang Zhang, Di Wu, Yan-Rui Guo, Ke-Bin Ren, Yun-Zhi Tan
Rock and Soil Mechanics
The Central Plains are located in an area that experiences seasonal freeze-thaw cycles, which can have significant effects on the soil structure of soil relics. To determine if lime-metakaolin (L-MK) is a feasible alternative to natural hydraulic lime (NHL) for earth site restoration work, tests were conducted using lime, metakaolin and silty sand from the site as main raw materials. Mass loss, unconfined compressive strength and splitting tensile strength tests were carried out on L-MK improved silty sand soil undergoing different numbers of freeze-thaw cycles to study its strength characteristics in depth. X-ray diffraction (XRD) thermogravimetry (TG), and scanning electron …
Improvement Of Rainfall Boundary Treatment Based On The Diffusion Wave Approximation Equation, Xu Wang, Mei Dong, Meng-Yue Kong, Yun-Peng Deng, Ri-Qing Xu, Xiao-Nan Gong
Improvement Of Rainfall Boundary Treatment Based On The Diffusion Wave Approximation Equation, Xu Wang, Mei Dong, Meng-Yue Kong, Yun-Peng Deng, Ri-Qing Xu, Xiao-Nan Gong
Rock and Soil Mechanics
During the simulation of rainwater infiltration, the conventional rainfall boundary cannot accurately reflect the influence of the variation of ponding water depth on the calculation of actual rainwater infiltration rate. To address this issue, the conventional rainfall boundary is improved by incorporating the diffusion wave approximation equation, allowing for the coupling of ponding water depth variations with actual infiltration rate during heavy rainfall events. Additionally, the accuracy of the improved boundary is validated through two classical experimental cases. The improved boundary is subsequently applied to the simulation of an actual engineering scenario. The findings indicate that the improved rainfall boundary …
Three-Dimensional Unified Mechanical Model And Calculation Method Of Uplift Capacity Of Horizontal Rectangular Anchor Plate In The Whole Region In Sand, Wei Hu, Hui Wang, Chen Yao, Dong-Xue Hao, Dan-Da Shi
Three-Dimensional Unified Mechanical Model And Calculation Method Of Uplift Capacity Of Horizontal Rectangular Anchor Plate In The Whole Region In Sand, Wei Hu, Hui Wang, Chen Yao, Dong-Xue Hao, Dan-Da Shi
Rock and Soil Mechanics
Uplift of the horizontal rectangular anchor plate is a typical three-dimensional problem. However, it is difficult to characterize the sliding surface of soil around the anchor plate in the limit state for its shape is affected by a combination of the length-width ratio and embedment ratio of the anchor plate. Combining the results of ABAQUS 3D numerical simulation and 2D sliding surface analysis, it is found that the geometric form of the 3D sliding surface in any horizontal section within its buried depth range can be described by a closed graph, including four segments of straight lines parallel and equal …
Refined Analysis On Stress State Of Cutoff Wall Of High Asphaltic Core Dam On Super-Deep Overburden, De-Gao Zou, Yong-Qian Qu, Xian-Jing Kong, Kai Chen, Jing-Mao Liu, Jin Gong
Refined Analysis On Stress State Of Cutoff Wall Of High Asphaltic Core Dam On Super-Deep Overburden, De-Gao Zou, Yong-Qian Qu, Xian-Jing Kong, Kai Chen, Jing-Mao Liu, Jin Gong
Rock and Soil Mechanics
The concrete cutoff wall is the main anti-seepage structure of the rockfill dam resting on the deep overburden foundation, and is the key to ensuring the dam safety. Therefore, it is of great significance to accurately simulate the stress state of cutoff wall for evaluation of the rockfill dam resting on the deep overburden. Combining the incremental iteration method and the finite element-scaled boundary finite element coupling method (FEM-SBFEM), this paper realizes the trans-scale refined numerical analysis of the stress and deformation of the rockfill dam, which overcomes the low precision of the conventional midpoint increment method in solving local …
Characteristics Of The Cumulative Plastic Deformation And Pore Water Pressure Of Saturated Sand Under Cyclic Intermittent Loading, Qi Yang, Xiao-Ya Wang, Ru-Song Nie, Chen Chen, Yuan-Zheng Chen, Fang Xu
Characteristics Of The Cumulative Plastic Deformation And Pore Water Pressure Of Saturated Sand Under Cyclic Intermittent Loading, Qi Yang, Xiao-Ya Wang, Ru-Song Nie, Chen Chen, Yuan-Zheng Chen, Fang Xu
Rock and Soil Mechanics
The long-term train loads can result in problems such as strength attenuation, excessive cumulative settlement and even subsidence in sandy soil foundations and filling materials, which can jeopardize train operation safety. To understand the mechanism of the disease, it is necessary to explore the cumulative plastic deformation and pore water pressure characteristics of saturated sand under intermittent loading. Therefore, dynamic triaxial tests under continuous and intermittent loading with different dynamic amplitudes and confining pressures were performed. The test results showed that: (1) The cumulative plastic deformation-loading cycle curve of saturated sand exhibited a “zigzag” pattern. The intermittent effect led to …
Experimental Study On The Mechanical Response Of Buried Pipelines Under Different Subsidence Patterns, Yu Zhang, Hao Liang, Liang Lin, You Zhou, Qing-Song Zhao
Experimental Study On The Mechanical Response Of Buried Pipelines Under Different Subsidence Patterns, Yu Zhang, Hao Liang, Liang Lin, You Zhou, Qing-Song Zhao
Rock and Soil Mechanics
The frequent occurrence of buried pipeline accidents caused by the ground collapse and subsidence makes it urgent to carry out experimental studies on the mechanical response under different subsidence effects. A systematical survey of the pipeline strain, earth pressure and soil deformation was conducted considering the effects of ground subsidence and collapse. The result showed that due to the arching effect at the top of the pipeline, the strain and earth pressure firstly increased and then decreased with the extension of the collapse zone, while they increased as the subsidence zone extended during the collapse and settlement. In the subsidence …
Creep–Fatigue Constitutive Model Of Salt Rock Based On A Hardening Parameter, Jin-Yang Fan, Lu-Xuan Tang, Jie Chen, Zhen-Yu Yang, De-Yi Jiang
Creep–Fatigue Constitutive Model Of Salt Rock Based On A Hardening Parameter, Jin-Yang Fan, Lu-Xuan Tang, Jie Chen, Zhen-Yu Yang, De-Yi Jiang
Rock and Soil Mechanics
Salt rock has been recognized as an ideal medium for energy storage or oil and gas storage because of its good creep and self-healing characteristics. Accurate characterization and prediction of the complex mechanical behavior of salt rock is the basis for ensuring the safety of underground space utilization project of salt caverns. Based on proposed parameters of hardening and other characteristic factors, in this study, a new creep–fatigue constitutive model is developed for salt rock considering complex loading and unloading paths. Based on the dislocation mechanism of salt rock deformation, hyperbolic damping elements are introduced as state variables to characterize …
Applicability Of Power-Law Stress-Strain Model For Coral Sand Under Earth Fills Stress Path, Ji-Ru Zhang, Yan-Jun Zheng, Wei-Ke Peng, Lei Wang, Jing-Xin Chen
Applicability Of Power-Law Stress-Strain Model For Coral Sand Under Earth Fills Stress Path, Ji-Ru Zhang, Yan-Jun Zheng, Wei-Ke Peng, Lei Wang, Jing-Xin Chen
Rock and Soil Mechanics
Coral sands are commonly used in hydraulic fill foundations and as subgrade fill in the construction of islands and reefs. The stress paths followed by soil consolidation or filled subgrade are characterized by K0 consolidation or constant stress ratio stress path. It is necessary to develop a computational model that reflects the effect of stress path on deformation in order to accurately estimate soil deformation during the filling process. Based on the generalized Hooke's law, a nonlinear elastic model in the form of a power function is proposed to describe the stress-strain curve of coral sand, and the functional expression …
Mechanical Properties Of Sand 3d Printed Rock-Like Samples Based On Different Post-Processing Methods, Wei Tian, Xiao-Hui Wang, Wei Yun, Xu Cheng
Mechanical Properties Of Sand 3d Printed Rock-Like Samples Based On Different Post-Processing Methods, Wei Tian, Xiao-Hui Wang, Wei Yun, Xu Cheng
Rock and Soil Mechanics
3D printing, a rapid prototyping technology, has great potential for applications in laboratory rock tests, but the low strength and stiffness of 3D printed samples have been one of the key problems that need to be addressed. In order to find a way to enhance the strength and stiffness of 3D printed rock-like samples, GS19 sand and furan resin were selected as printing materials, and sand 3D printed rock-like samples were used as research objects. Based on this, the samples were post-processed using three different methods: vacuum infiltration, low-temperature treatment, and combination of infiltration and low-temperature. Uniaxial compression tests were …
Disintegration Characteristics And Mechanism Of Dispersive Soil Modified By Si/Ca Compound System, Yi-Fei Liu, Ze-Fan Bu, Dong-Ting Cai, Heng-Hui Fan, Zhuo Zhang, Han Ru, Juan-Li Ju
Disintegration Characteristics And Mechanism Of Dispersive Soil Modified By Si/Ca Compound System, Yi-Fei Liu, Ze-Fan Bu, Dong-Ting Cai, Heng-Hui Fan, Zhuo Zhang, Han Ru, Juan-Li Ju
Rock and Soil Mechanics
Dispersive soil has the characteristic of being dispersed and lost when encountering water. In engineering practice, lime and cement are often used to modify dispersive soil, but doing so often has such problems as environmental pollution. The Si/Ca compound system composed of nano silica sol and calcium chloride is selected as the modified material for dispersive soil. The effect of the modification is studied by pinhole test, mud ball test, and dispersion and disintegration test. The mechanism of dispersive soil modified by Si/Ca compound system is explored by physical and chemical properties tests. The results show that the dispersibility of …
Dynamic Response And Characteristics Of Tapered Rigid Core Composite Cement- Soil Piles Under Cyclic Loading, Jie He, Duan-Wei Guo, De-Xin Song, Meng-Xin Liu, Lei Zhang, Qi-Feng Wen
Dynamic Response And Characteristics Of Tapered Rigid Core Composite Cement- Soil Piles Under Cyclic Loading, Jie He, Duan-Wei Guo, De-Xin Song, Meng-Xin Liu, Lei Zhang, Qi-Feng Wen
Rock and Soil Mechanics
Tapered rigid core composite cement-soil pile is an emerging type of composite pile. In order to investigate its bearing behavior in engineering applications such as highways and railways under long-term cyclic loading, model tests were conducted on four composite piles with different pile core wedge angles, static loading ratios and cyclic loading ratios. The ultimate bearing capacity under static loading as well as the cumulative settlement, pile axial force distribution, tip resistance and side friction resistance were evaluated. The results indicated that the bearing capacity of tapered inner core composite piles under static loading was better than that of constant …
Infiltration Characteristics And Deformation Mechanism Of Rainfall-Induced Landslides In Three Gorges Reservoir Area Based On 1d And 2d Model Tests, Li Wang, Fang-Yun Nan, Shi-Mei Wangi, Yong Chen, Xiao-Wei Li, Zhi-Hong Fan, Yu-Shan Chen
Infiltration Characteristics And Deformation Mechanism Of Rainfall-Induced Landslides In Three Gorges Reservoir Area Based On 1d And 2d Model Tests, Li Wang, Fang-Yun Nan, Shi-Mei Wangi, Yong Chen, Xiao-Wei Li, Zhi-Hong Fan, Yu-Shan Chen
Rock and Soil Mechanics
Shallow deformation of ancient landslides induced by heavy rainfall is the most serious geological disaster in China's Three Gorges Reservoir Area (TGRA). It is important to explore the infiltration characteristics and its shallow deformation mechanism caused by heavy rainfall. In this study, the rainfall-induced landslide of the TGRA was selected as the research object, and the distributions of the soil permeability coefficients for rainfall-type landslide were summarized. Considering the effects of heavy rainfall, one-dimensional (1D) soil column infiltration test and two-dimensional (2D) landslide model test were conducted to study the infiltration characteristics of landslide soil and the corresponding shallow deformation …
Mechanical Properties Of Fractured Sandstone After Cyclic Thermal Shock, Man Li, Xian-Shan Liu, Yu-Hua Pan, Shi-Hao Qiao, Zi-Yu Hao, Lei Qian, Xiao-Lei Luo
Mechanical Properties Of Fractured Sandstone After Cyclic Thermal Shock, Man Li, Xian-Shan Liu, Yu-Hua Pan, Shi-Hao Qiao, Zi-Yu Hao, Lei Qian, Xiao-Lei Luo
Rock and Soil Mechanics
The stimulation of thermal reservoirs in sandstone and its long-term stability evaluation are of great significance to the development of geothermal energy. In this paper, the mechanical properties of fractured sandstone under 0–8 cycles of thermal shocks are studied. The experimental results show that the P-wave velocity, uniaxial compressive strength (UCS) and elastic modulus of fractured sandstone all decrease gradually with the increase in the number of thermal shocks under two types of cooling methods. Compared with the cooling method in the water, the natural cooling method in the air causes less damage to the mechanical properties of fractured sandstone. …
Evolution Mechanism Of Deformation And Failure Of Rock Slope With Controlling Fissure Through Transparent Physical Model Experiments, Xian-Lun Leng, Chuan Wang, Qian Sheng, Wen-Jun Song, Jian Chen, Zhan-Rong Zhang, Fei Chen
Evolution Mechanism Of Deformation And Failure Of Rock Slope With Controlling Fissure Through Transparent Physical Model Experiments, Xian-Lun Leng, Chuan Wang, Qian Sheng, Wen-Jun Song, Jian Chen, Zhan-Rong Zhang, Fei Chen
Rock and Soil Mechanics
The deformation and failure evolution process of rock slope during disaster incubation period is controlled by internal long fissures (controlling fissures), and the evolution mechanism is of great significance for the prevention of landslide disasters. Based on the transparent physical model experiment technology, two typical rock slopes with controlling fissures (one with a steep fissure in the upper part of slope and the other with a gently inclined fissure in the lower part) were selected as the objects, and the evolution process of deformation and failure inside the slopes was studied through physical model experiments using the self-developed equipment. The …
Permeability Evolution In The Initial Period Of Oil Production Based On Field Well Test Data And Coreflooding Tests, Kozhevnikov Evgenii V., Turbakov Mikhail S., Riabokon Evgenii P., Gladkikh Evgeniy A., Poplygin Vladimir V., Guzev Mikhail A., Cheng-Zhi Qi
Permeability Evolution In The Initial Period Of Oil Production Based On Field Well Test Data And Coreflooding Tests, Kozhevnikov Evgenii V., Turbakov Mikhail S., Riabokon Evgenii P., Gladkikh Evgeniy A., Poplygin Vladimir V., Guzev Mikhail A., Cheng-Zhi Qi
Rock and Soil Mechanics
Permeability prediction during hydrocarbon production is a rather important problem. The decrease in permeability due to depletion reserves and the drop in reservoir pressure (increase in effective pressure) leads to an increase in the time of oil or gas production. A large number of works have been devoted to the problem of permeability reduction due to effective pressure. Establishment of permeability models is carried out by various methods including coreflooding tests and field well tests. The results of previous studies have shown that permeability has a power-law or exponential dependence on effective pressure, however, the difficulty in predicting permeability is …
Long-Term Deformation Test And Model Study Of One-Dimensional Consolidation Of South China Sea Coral Mud Under Graded Loading And Unloading, Yang Shen, Jue Deng, He Weng, Long Yang
Long-Term Deformation Test And Model Study Of One-Dimensional Consolidation Of South China Sea Coral Mud Under Graded Loading And Unloading, Yang Shen, Jue Deng, He Weng, Long Yang
Rock and Soil Mechanics
South China Sea coral mud is a calcareous ooze of marine rock and soil formed by the accumulation of bones and debris after the death of coral groups, which has special engineering properties. It is significant to investigate its time dependent long-term nonlinear deformation under load for the construction and long-term stability analysis of dredger fill islands and reefs. Three groups of one-dimensional consolidation compression tests of coral mud with different loading and unloading schemes were carried out, and the influence of stress history on its long-term deformation properties was explored by changing the loading time and loading-unloading loops. According …
Effect Of Rubber–Sand Mixture Gradation On Shear Characteristics Of Mixed Soil, Fei-Yu Liu, Hao-Ze Li, Jun Fu, Hong-Lei Sun
Effect Of Rubber–Sand Mixture Gradation On Shear Characteristics Of Mixed Soil, Fei-Yu Liu, Hao-Ze Li, Jun Fu, Hong-Lei Sun
Rock and Soil Mechanics
To study the shear characteristics of rubber–sand mixtures, the effects of four rubber–sand mixture gradations (one type of gap gradation, two types of continuous gradations, and one type of open gradation), three rubber contents (10%, 30%, and 60%), and three vertical stresses (30 kPa, 60 kPa, and 90 kPa) on the strength and volumetric change characteristics of rubber–sand mixtures were investigated by using a large-scale laboratory direct shear apparatus. Then, the discrete element models of pure sand and rubber–sand mixtures were established according to the same gradation and rubber content. The intrinsic mechanism of rubber–sand mixtures was explored from the …
Deformation And Load Transmission Mechanism Of Prestressed Reinforced Embankment Subjected To Rockfall Impacts, Shu-Wen Ma, Liang Lu, Zong-Jian Wang, Jing-Tian Wang, Lan-Xing Li
Deformation And Load Transmission Mechanism Of Prestressed Reinforced Embankment Subjected To Rockfall Impacts, Shu-Wen Ma, Liang Lu, Zong-Jian Wang, Jing-Tian Wang, Lan-Xing Li
Rock and Soil Mechanics
The prestressed reinforced soil structure was proposed to solve the problem of large-area depressions of soil highways under rockfall impacts in remote mountain areas. Comparative model tests for prestressed reinforced soil embankment and traditional soil embankment were conducted to explore the deformation performance, mechanical response, and load transmission mechanism of both embankments under rockfall impacts. The results show that the size of pits formed in prestressed reinforced soil embankment is significantly smaller than that in traditional soil embankment, which reflects the good impact deformation resistance of prestressed reinforced soil embankment. The embankment stiffness increases with the increase of impact times, …
Excavation Response Analysis Of Prefabricated Recyclable Support Structure For Water-Rich Silt Foundation Pit, Rui-Song Wang, Cheng-Chao Guo, Pei-Yuan Lin, Fu-Ming Wang
Excavation Response Analysis Of Prefabricated Recyclable Support Structure For Water-Rich Silt Foundation Pit, Rui-Song Wang, Cheng-Chao Guo, Pei-Yuan Lin, Fu-Ming Wang
Rock and Soil Mechanics
The prefabricated recyclable support structure provides a new green support system with economic security, functional coordination and sustainable development for the development of underground space. The physical model test of the foundation pit of a pipe-jacking working well in Zhengzhou city is carried out based on the similarity theory. A three-dimensional fluid-solid coupling model that can differentiate the deformation difference between rigid and flexible components in the support system is established by using the ABAQUS software. The stress and deformation characteristics of support structure in the process of dewatering and excavation are analyzed. The influences of dewatering and excavation on …
Stress Jumping Of Elastic-Brittle Circular Coal Roadway And Prediction Model Of Rock Burst, Shu-Wen Wang, Wen-Jun Ju, Chun-Hui Zhang, Shi-Jie Su, Chuang Lu
Stress Jumping Of Elastic-Brittle Circular Coal Roadway And Prediction Model Of Rock Burst, Shu-Wen Wang, Wen-Jun Ju, Chun-Hui Zhang, Shi-Jie Su, Chuang Lu
Rock and Soil Mechanics
In order to predict the rock burst disasters of coal roadway, the coal with bump tendency is regarded as a perfectly elastic-brittle material, and the mechanical model of circular coal roadway is established to analyze the distribution characteristics of stress and deformation energy density of surrounding rock of coal roadway, and then the rock burst prediction model of coal roadway is established to predict the rock burst disaster of coal roadway. The results show that the tangential stress and deformation energy density of the surrounding rock of elastic-brittle coal roadway jump at the interface between the elastic zone and the …
Loosening Earth Pressure Based On Triangular Slip Surfaces, Jia-Quan Wang, Jia-Ming Chen, Zhi-Nan Lin, Yi Tang
Loosening Earth Pressure Based On Triangular Slip Surfaces, Jia-Quan Wang, Jia-Ming Chen, Zhi-Nan Lin, Yi Tang
Rock and Soil Mechanics
Soil deformation caused by karst collapse and tunnel excavation often causes uneven settlement, ground collapse and cracking in foundation. Development of approaches to determine the distribution of loose earth pressure at the top of soil structure and analyze the relationship between soil deformation and soil arching effect accurately is of much importance. A series of classical trapdoor tests with different H/B ratios is conducted to reveal the variation law of soil deformation and settlement on the loose earth pressure at the top of the structure. Based on the test results, a mathematical model is proposed to analyze the loose earth …
Study On The Mechanism Of Coal Bursts Induced By Quasi-Resonance Of Roof-Support System, Kai-Xing Wang, Jia-Qi Xue, Yi-Shan Pan, Lin-Ming Dou, Yong-Hui Xiao
Study On The Mechanism Of Coal Bursts Induced By Quasi-Resonance Of Roof-Support System, Kai-Xing Wang, Jia-Qi Xue, Yi-Shan Pan, Lin-Ming Dou, Yong-Hui Xiao
Rock and Soil Mechanics
The mechanism and prevention of coal burst is an important issue in the study of coal mine dynamic disasters. The disturbance of surrounding rocks can trigger the quasi-resonance phenomena of roadway roof support system in close proximity to its resonant state, ultimately inducing impact disasters. This is manifested in three strong quasi-resonant responses, including roof displacement, velocity and acceleration. Based on the support instability and plastic buckling criteria, three safety factors and the corresponding dangerous disturbance frequency ratio interval for the dynamic failure of support are proposed, and the support damping control strategy is given, aiming at the impact disasters …
Centrifugal Experimental Study On Seismic Response Of Bridge Pile Group Foundation In Saturated Sand Field Overlain By Water, Zhi-Xiao Yan, Yu-Run Li, Dong-Sheng Wang, Yong-Zhi Wang
Centrifugal Experimental Study On Seismic Response Of Bridge Pile Group Foundation In Saturated Sand Field Overlain By Water, Zhi-Xiao Yan, Yu-Run Li, Dong-Sheng Wang, Yong-Zhi Wang
Rock and Soil Mechanics
In order to explore the dynamic interaction of the soil−pile group foundation−bridge structure system in saturated sand field overlain by water, a physical similarity model of the vertical (inclined) pile group foundation−bridge structure was designed and manufactured. Centrifuge shaking table tests with seismic wave inputs of different ground motion intensities and characteristics were conducted. The dynamic characteristic indices of pile group foundation−bridge structure were analyzed, and the development of excess pore water pressure in the saturated sand foundation overlain by water and the dynamic response of pile−soil interaction were also investigated. The results indicated that the presence of overlying water …
Relationship Between Macro And Micro Friction Coefficients Of Sandstone Structural Surface Based On Nano-Scratch Test, Shuang Zheng, Rui Yong, Shi-Gui Du, Zhi-Hai He, Zhen Zhong, Ying-Ying Zhang, Su-Gang Sui
Relationship Between Macro And Micro Friction Coefficients Of Sandstone Structural Surface Based On Nano-Scratch Test, Shuang Zheng, Rui Yong, Shi-Gui Du, Zhi-Hai He, Zhen Zhong, Ying-Ying Zhang, Su-Gang Sui
Rock and Soil Mechanics
Basic friction coefficients are important parameters affecting the shear strength of structural surface in rock masses. The basic friction coefficient determined by conventional laboratory test methods is influenced by mineral composition, temperature, and other factors. To systematically reveal the basic frictional properties of structural surfaces, the macro and micro friction coefficients of sandstone were investigated separately, and their relationship was established. First, mineral components and mechanical parameters of the sandstone were determined by X-ray diffraction and nanoindentation tests. Second, the friction coefficient in the macro scale was examined by tilt test and direct shear test, and the direct shear test …
Numerical Study On Failure Path Of Rock Slope Induced By Multi-Stage Excavation Unloading Based On Crack Propagation, Chuan Wang, Xian-Lun Leng, Zhan-Rong Zhang, Chuang Yang, Jian Chen
Numerical Study On Failure Path Of Rock Slope Induced By Multi-Stage Excavation Unloading Based On Crack Propagation, Chuan Wang, Xian-Lun Leng, Zhan-Rong Zhang, Chuang Yang, Jian Chen
Rock and Soil Mechanics
The investigation on failure patterns and paths of cracked rock slopes under excavation unloading is one of the hot issues in the slope engineering field. Accurate identification of the potential failure path is of great significance for excavation safety and support design of the slope. A theoretical method for crack propagation discrimination was embedded into the numerical simulation based on the fracture propagation analysis method, and the quick simulation of initiation, propagation, and coalescence of discontinuous cracks in rock masses was realized through stress intensity factor calculation at crack tip, crack propagation pattern recognition, crack initiation angle derivation, and crack …
An Improved Shear Strength Model Of Unsaturated Soils Over A Wide Suction Range, Yu-Xin Zhao, Xu Li, Sen Lin, Xiao-Meng Wang
An Improved Shear Strength Model Of Unsaturated Soils Over A Wide Suction Range, Yu-Xin Zhao, Xu Li, Sen Lin, Xiao-Meng Wang
Rock and Soil Mechanics
Different types of unsaturated soils are widespread in nature. Due to the differences in grain size and mineral composition, the shear strength characteristics of the unsaturated soils are significantly different over a wide suction range. In order to establish a unified model for predicting the shear strength of different soil types over a wide suction range, a systematic investigation was carried out to examine the effect of soil type on the shear strength of unsaturated soils. An improved shear strength model is proposed based on the advantages of two traditional equations. The proposed model is verified by comparing the published …