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- Acoustic emission (4)
- Calcareous sand (4)
- Microstructure (4)
- Anisotropy (3)
- Crack propagation (3)
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- Model test (3)
- Numerical simulation (3)
- Rock mechanics (3)
- Shield tunnel (3)
- 3D reconstruction (2)
- Analytical solution (2)
- CT scan (2)
- Compacted loess (2)
- Cyclic loading (2)
- Drying?wetting cycle (2)
- Dynamic disturbance (2)
- Dynamic response (2)
- Failure mechanism (2)
- Geopolymer (2)
- Granite (2)
- Initial water content (2)
- Internal erosion (2)
- Mechanical property (2)
- Microbially induced calcium carbonate precipitation (MICP) (2)
- Numerical manifold method (2)
- Pore characteristics (2)
- Pore size distribution (2)
- Prediction model (2)
- Pressure plate method (2)
- Quantitative characterization (2)
Articles 1 - 30 of 107
Full-Text Articles in Engineering
Dynamic Behaviors Of Micp And Fiber-Treated Calcareous Sand Under Dynamic Triaxial Testing, Rui Wang, Xiao-Hua Pan, Chao-Sheng Tang, Chao L, Dian-Long Wang, Zhi-Hao Dong, Bin Shi
Dynamic Behaviors Of Micp And Fiber-Treated Calcareous Sand Under Dynamic Triaxial Testing, Rui Wang, Xiao-Hua Pan, Chao-Sheng Tang, Chao L, Dian-Long Wang, Zhi-Hao Dong, Bin Shi
Rock and Soil Mechanics
To improve the liquefaction resistance of calcareous sand foundations, microbially induced calcium carbonate precipitation (MICP) technology and fiber reinforcement technology was combined to treat the calcareous sand sampled from the South China Sea. Based on dynamic triaxial tests, the dynamic behaviors of MICP-treated and fiber-reinforced calcareous sand, including dynamic strain, dynamic pore pressure, stress−strain hysteresis loop and dynamic modulus of elasticity, were analyzed. Then, the strengthening mechanism of MICP and fiber on the mechanical properties of the treated calcareous sand was explored from the microscopic point of view, based on the scanning electron microscope (SEM) test results. The results show …
Experimental Study On Internal Erosion Behaviors Under Fluctuating Hydraulic Condition Using Transparent Soil, Ze-Zhi Deng, En-Yue Ji, Gang Wang
Experimental Study On Internal Erosion Behaviors Under Fluctuating Hydraulic Condition Using Transparent Soil, Ze-Zhi Deng, En-Yue Ji, Gang Wang
Rock and Soil Mechanics
Internal erosion is a phenomenon that fine particles migrate through the channels within coarse matrix under seepage flow. Previous studies mainly focused on the internal erosion under steady hydraulic gradient, while the studies on the behavior and mesoscopic mechanism of internal erosion under fluctuating hydraulic condition were rarely reported. In this study, a setup of transparent soil seepage test was developed. Seepage tests on two types of soils with different internal stability were conducted under steady and fluctuating hydraulic conditions respectively to investigate the internal erosion behaviors under fluctuating hydraulic condition. The macroscopic experimental phenomenon showed that when the hydraulic …
Modification Of Linear Regression Method For Rock Shear Strength Parameters Under Triaxial Condition, Bin Li, Da-Guo Wang, Zhi-Liang He, Peng Wang
Modification Of Linear Regression Method For Rock Shear Strength Parameters Under Triaxial Condition, Bin Li, Da-Guo Wang, Zhi-Liang He, Peng Wang
Rock and Soil Mechanics
The triaxial strength envelope of rocks is usually nonlinear, and the shear strength parameters obtained by the linear regression method (LRM) are highly sensitive to confining pressure. In order to enable LRM to consider the influence of confining pressure on the estimation of shear strength parameters, the confining pressure effect coefficient of triaxial strength of rocks is defined. An exponential function is constructed to express the relationship between the coefficient and confining pressure, which is also introduced into the correction of LRM. A linear regression method considering confining pressure effects (CCPE-LRM) is proposed. At the same time, a rationality test …
Experimental Research On Fracture Initiation Pressure Of Conventional Triaxial Slurry Fracturing In Similar Material Of Sandy Mudstone, Hua Cheng, Xiang-Yang Liu, Ru-Kang Cao, Xue-Song Wang
Experimental Research On Fracture Initiation Pressure Of Conventional Triaxial Slurry Fracturing In Similar Material Of Sandy Mudstone, Hua Cheng, Xiang-Yang Liu, Ru-Kang Cao, Xue-Song Wang
Rock and Soil Mechanics
To further explore the fracture initiation mechanism of fracture grouting in typical sandy mudstone from Huainan and Huaibei mining areas in China, a conventional triaxial fracture grouting test device was developed, and the model test of fracture initiation pressure of slurry fracturing in similar material of sandy mudstone was carried out. Based on the test results, the influences of rock strength and stress state on grouting fracture initiation pressure and fracture propagation pattern were analyzed, and the fracture initiation mechanism of fracture grouting in sandy mudstone was revealed. The results show that there is a positive correlation between the initiation …
Soil-Water Characteristic Of Biochar-Clay Mixture In The Full Suction Range, Ming-Yu Li, Wen-Jing Sun, Qiang Huang, De-An Sun
Soil-Water Characteristic Of Biochar-Clay Mixture In The Full Suction Range, Ming-Yu Li, Wen-Jing Sun, Qiang Huang, De-An Sun
Rock and Soil Mechanics
Soil-water characteristic curve (SWCC) plays an important role in defining the hydro-mechanical behavior of unsaturated soils. Biochar has the properties of porous structure, high specific surface area and high adsorption. The hydraulic characteristics of biochar-amended soil may change due to the influence of natural environmental factors when applied as the cover layer of landfills. In order to study the effect of biochar content on the water retention behavior of biochar-clay mixture in full suction range, the suction of samples was controlled by vapor equilibrium technique (suction range 3–368 MPa), filter paper method (suction range 0–40 MPa) and pressure plate method …
Macro-Mesoscopic Investigation Of Cushioning Mechanism Of Recycled Concrete Aggregate Under Successive Rockfall Impacts, Yu-Chen Su, Yuan Wang, Hui-Ming Tang, Heng Zhong, Xin Li, Chao-Fu Liu, Ya-Ru L
Macro-Mesoscopic Investigation Of Cushioning Mechanism Of Recycled Concrete Aggregate Under Successive Rockfall Impacts, Yu-Chen Su, Yuan Wang, Hui-Ming Tang, Heng Zhong, Xin Li, Chao-Fu Liu, Ya-Ru L
Rock and Soil Mechanics
Cushion materials can effectively reduce the impact load acting on the rigid protective structures such as shed tunnel and improve the impact resistance of the structures. In order to investigate the variation of cushioning performance of recycled concrete aggregate (RCA) under successive impacts, drop weight impact tests and discrete element simulations are carried out. Test results show that compared with the quartz sand cushion, the transmitted load at the center of concrete shed for RCA under the first impact reduces by 83%, and it is distributed more uniformly. With the increase in the number of impacts, the cushioning performances of …
Three-Dimensional Stability Limit Analysis Of Cracked Loess Slopes, Xue-Liang Zhu, Sheng-Jun Shao, Xiao-Jun Shen, Shuai Shao, Xiao-Kang Liu
Three-Dimensional Stability Limit Analysis Of Cracked Loess Slopes, Xue-Liang Zhu, Sheng-Jun Shao, Xiao-Jun Shen, Shuai Shao, Xiao-Kang Liu
Rock and Soil Mechanics
The development of vertical cracks in loess slopes often affects slope stability. Compared with the plane strain mechanism, the slope stability analysis under the three-dimensional (3D) failure mechanism is closer to the actual slope instability. Based on the upper bound method of plastic limit analysis, different failure mechanisms (face failure, toe failure and base failure) of 3D loess slope with pre-existing cracks are considered, the energy balance equation and its dimensionless critical height expression γH/c are established, and the upper bound solution of critical height is obtained by random search method. The effects of constraint width, slope angle, internal friction …
Statistical And Regression Analyses Of Sands Stiffness In Triaxial Tests And Application Of The Results, Sharafutdinov Rafael
Statistical And Regression Analyses Of Sands Stiffness In Triaxial Tests And Application Of The Results, Sharafutdinov Rafael
Rock and Soil Mechanics
The density and stress state significantly impact on the sand stiffness. Many of hardening soil models used for geotechnical computation are based on Duncan-Chang model and do not consider the influence of density on the soil stiffness. In course of triaxial compression of very dense or loose sands, the shear strains rise induces significant changes in density. In order to evaluate the effects of grain size distribution, density, and stress state on stiffness, the results of 962 isotropic triaxial tests on soil samples from 15 Moscow and Minsk construction sites were processed using statistical and regression analysis. As a result, …
Influence Of Particle Size Distribution And Initial Dry Density On The Characteristics Of Subgrade Mud Pumping, Yu Ding, Yu Jia, Xuan Wang, Jia-Sheng Zhang, Xiao-Bin Chen, Hao Luo, Yu Zhang
Influence Of Particle Size Distribution And Initial Dry Density On The Characteristics Of Subgrade Mud Pumping, Yu Ding, Yu Jia, Xuan Wang, Jia-Sheng Zhang, Xiao-Bin Chen, Hao Luo, Yu Zhang
Rock and Soil Mechanics
The subgrade mud pumping of heavy-haul railway is widespread and harmful, which seriously affects the stability of tracks and the safety of train operation. The properties of railway subgrade soil, such as the particle gradation, the void ratio, have a significant impact on the characteristics of subgrade mud pumping under train load. In this study, a series of remolded samples consisting of silty clay and different content of Kaolin was subjected to mud pumping tests with a self-developed test model. The influence of varying particle gradations (Kaolin content) and initial dry densities (void ratio) on axial strain, excess pore water …
Experimental Study On Influence Of Positional Relationship Between Dynamic Load And Long Axis On Impact Rockburst In An Elliptical Cavern, Yang Wang, Dong-Qiao Liu, Fu-Qiang Ren, Tian-Xiang Hu, Man-Chao He
Experimental Study On Influence Of Positional Relationship Between Dynamic Load And Long Axis On Impact Rockburst In An Elliptical Cavern, Yang Wang, Dong-Qiao Liu, Fu-Qiang Ren, Tian-Xiang Hu, Man-Chao He
Rock and Soil Mechanics
In order to explore the influence of the relative positional relationship between the dynamic load and the long axis of the elliptical cavern on the characteristics of impact rockburst, a cuboid sample with an elliptical hole is prepared. With two positional relationships of disturbance direction parallel or perpendicular to the long axis of the elliptical cavern, the elliptical cavern impact rockburst experiments are carried out. With the aid of video recording device, the characteristics of the impact rockburst of the elliptical cavern are discussed in terms of damage process of rockburst ejection, ejection speed, failure mode and fragment size. The …
Deterioration-Buckling Failure Mechanism Of Consequent Bedding Limestone Bank Slope In Three Gorges Reservoir Area, Guo-Qiang Yan, Yue-Ping Yin, Bo-Lin Huang, Lei Hu
Deterioration-Buckling Failure Mechanism Of Consequent Bedding Limestone Bank Slope In Three Gorges Reservoir Area, Guo-Qiang Yan, Yue-Ping Yin, Bo-Lin Huang, Lei Hu
Rock and Soil Mechanics
In the Wuxia section of the Three Gorges Reservoir area, it is found that there are many deformation signs of sliding-bending along the bedding bank slope, and the cyclic fluctuation of reservoir water worsens the deterioration and instability of the bank leading edge. Taking Qingshi #6 slope in the Wuxia section as an example, an laboratory generalized model is constructed to study the catastrophe mechanism of bedding limestone bank slope under the deterioration of rock mass in hydro-fluctuation belt. The research shows that: the bank slope is in a stable state as a whole for a long time before impoundment. …
Investigation Of The Influence Of Interaction Of Wraparound Geogrid-Sand On The Load Bearing-Settlement Behavior Of Strip Footings, Hussein Ahmad, Ahmad Mahboubi, Ali Noorzad, Mohammad Hosein Hoseini
Investigation Of The Influence Of Interaction Of Wraparound Geogrid-Sand On The Load Bearing-Settlement Behavior Of Strip Footings, Hussein Ahmad, Ahmad Mahboubi, Ali Noorzad, Mohammad Hosein Hoseini
Rock and Soil Mechanics
The use of high-quality materials and the strengthening of soil layers, especially in areas with poor bedding, are among the most important factors in stabilizing and achieving the useful life of building structure. An experimental study on a strip footing coated with unreinforced, geogrid-reinforced, and folded geogrid layers of fine sand is presented in this paper. Testing procedures evaluate variables such as the number of planar geogrid layers, the position of the folded geogrid within the soil, the thickness of the geogrid folded layer, the overlap lengths of a folded geogrid, the spacing within folded layers of geogrid, and several …
Study Of Multi-Parameter Dominant Grouping Method Of Rock Mass Discontinuity Based On The Principal Component Analysis, Fu-Rui Dong, Shu-Hong Wang, Qin-Kuan Hou
Study Of Multi-Parameter Dominant Grouping Method Of Rock Mass Discontinuity Based On The Principal Component Analysis, Fu-Rui Dong, Shu-Hong Wang, Qin-Kuan Hou
Rock and Soil Mechanics
Statistical analysis and clustering of discontinuities existing in rock mass are the basis of rock mass engineering stability analysis. Considering that the mechanical and hydraulic properties of discontinuities are affected by many factors such as occurrence, trace length, aperture, roughness, and filling state, a multi-parameter dominant grouping method of rock mass discontinuities based on principal component analysis is proposed. Firstly, the principal component analysis method is used to select the criterion of the dominant grouping and calculate the weight value of its participation in similarity measurement. Secondly, the global optimal initial clustering center of the fuzzy C-means clustering algorithm is …
Mechanical Properties Of Slag-Fly Ash Based Geopolymer Stabilized Sandy Soil, Jin-Jin Zhang, Bo Li, Chuang Yu, Mao-Yu Zhang
Mechanical Properties Of Slag-Fly Ash Based Geopolymer Stabilized Sandy Soil, Jin-Jin Zhang, Bo Li, Chuang Yu, Mao-Yu Zhang
Rock and Soil Mechanics
Silicate cement as a conventional soil curing agent has problems of high energy consumption and high emissions, and researchers have been seeking a more economical and environmentally friendly alternative to cement. In this study, geopolymers based on ground granulated blast-furnace slag (GGBS) and fly ash (FA) were used to reinforce sandy soils, and the effects of different factors on the mechanical properties of geopolymer stabilized sandy soils were investigated by adjusting the type and ratio of exciter, slag-fly ash ratio, water-cement ratio, and curing conditions. The specimens were studied in depth by unconfined compressive strength (UCS) test, electron computed tomography …
Experimental Study Of Fracture Dynamic Evolution Process Of Grouted Specimen Under Uniaxial Compression Based On Ct Scanning, Chang-Xing Zhu, Jia-Xin Sun, Yan-Wei Wang
Experimental Study Of Fracture Dynamic Evolution Process Of Grouted Specimen Under Uniaxial Compression Based On Ct Scanning, Chang-Xing Zhu, Jia-Xin Sun, Yan-Wei Wang
Rock and Soil Mechanics
To study the fracture dynamic evolution process of grouted specimens under loading conditions, the graded gravel grouted specimen was periodically scanned during the uniaxial compression damage process using a CT scanning system. Based on the image reconstruction technique, the spatial visualization of the fracture structure inside the test grouted specimen block is achieved, and the structural characteristic parameters are characterized quantitatively such as the number and volume of fractures. The gray value and fractal dimension of the CT slices are calculated using Python programming to analyze the mesoscale damage extent at different loading stages of the grouted specimen. It is …
Application Of Nonlinear Soil Resistance-Pile Lateral Displacement Curve Based On Pasternak Foundation Model In Foundation Pit Retaining Piles, Yan-Peng Zhu, Lin-Ping Wu, Duo-Bang Shi, Zhuang-Fu Zhao, Xiang-Xiang L, Xin-Guo Duan
Application Of Nonlinear Soil Resistance-Pile Lateral Displacement Curve Based On Pasternak Foundation Model In Foundation Pit Retaining Piles, Yan-Peng Zhu, Lin-Ping Wu, Duo-Bang Shi, Zhuang-Fu Zhao, Xiang-Xiang L, Xin-Guo Duan
Rock and Soil Mechanics
As a direct retaining structure in the process of foundation pit excavation, the internal force and deformation of pile under horizontal load have great influence on the safety and economy of foundation pit engineering. In order to calculate the internal force and deformation of the supporting pile more accurately, the nonlinear foundation reaction modulus is obtained according to the nonlinear soil resistance-pile lateral displacement (p−y) curve of pile-soil interaction. At the same time, the Pasternak two-parameter foundation model is introduced to fully consider the continuity of pile side soil deformation. The differential equation of retaining pile deflection considering pile-anchor deformation …
Inversion Iterative Correction Method For Estimating Shear Strength Of Rock And Soil Mass In Slope Engineering, Wei Jiang, Ye Ouyang, Jin-Zhou Yan, Zhi-Jian Wang, Li-Peng Liu
Inversion Iterative Correction Method For Estimating Shear Strength Of Rock And Soil Mass In Slope Engineering, Wei Jiang, Ye Ouyang, Jin-Zhou Yan, Zhi-Jian Wang, Li-Peng Liu
Rock and Soil Mechanics
For the slopes that have failed or deformed significantly, the shear strength of rock and soil mass is frequently inversely estimated based on a factor of safety assumed. For the slope with a sliding surface passing through multi-layer rock and soil mass, it is unreasonable to achieve this goal by blind trial. To solve this issue, back propagation (BP) neural network is constructed using shear strength of multi-layer rock and soil mass as the input, and the factor of safety of slope, the entrance and exit positions of the sliding surface obtained by Geoslope as the outputs. Then, based on …
Research Progress On Support Technology And Methods For Soft Rock With Large Deformation Hazards In China, Yong-Shui Kang, Zhi Geng, Quan-Sheng Liu, Bin Liu, Yuan-Guang Zhu
Research Progress On Support Technology And Methods For Soft Rock With Large Deformation Hazards In China, Yong-Shui Kang, Zhi Geng, Quan-Sheng Liu, Bin Liu, Yuan-Guang Zhu
Rock and Soil Mechanics
Soft rock engineering is involved in many important engineering fields such as mining, hydraulic engineering, transportation and national defense. With the increase of mining depth and the development of tunnel engineering, a large number of tunnels and roadways need to pass through soft rock formations, in which the problems such as high geostress and broken and weak surrounding rocks are prominent. Large deformation disasters of soft rocks pose serious threats to engineering safety and cause enormeous economic losses. In this paper, the research progress on soft rock support in China is first reviewed, and the research status quo of technology …
Elastic-Plastic Deformation Of Surrounding Rocks Under Graded Yielding Support Of Tunnel, Jian-Hua Dong, Bin Xu, Xiao-Lei Wu, Bo Lian
Elastic-Plastic Deformation Of Surrounding Rocks Under Graded Yielding Support Of Tunnel, Jian-Hua Dong, Bin Xu, Xiao-Lei Wu, Bo Lian
Rock and Soil Mechanics
In order to solve the failure of support structure of tunnel in high stress soft rock, based on the principle of reasonably releasing the stress in surrounding rocks and reducing the stress of support structure, a hydraulic tunnel graded yielding support structure is proposed. Considering the spatial effect of the excavation surface and the strain softening condition of the surrounding rocks, by analyzing the attenuation law of the virtual supporting force, the static balance equation of stress in the surrounding rocks, the virtual support force and the support reaction force is established. The synergy between the supporting structure and the …
Slope Stability Of An Unsaturated Embankment With And Without Natural Pore Water Salinity Subjected To Rainfall Infiltration, Sadeghi Hamed, Kolahdooz Ali, Ahmadi Mohammad-Mehdi
Slope Stability Of An Unsaturated Embankment With And Without Natural Pore Water Salinity Subjected To Rainfall Infiltration, Sadeghi Hamed, Kolahdooz Ali, Ahmadi Mohammad-Mehdi
Rock and Soil Mechanics
Natural soils contain a certain amount of salt in the form of dissolved ions or electrically charged atoms, originated from the long-term erosion by acidic rainwater. The dissolved salt poses an extra osmotic water potential being normally neglected in laboratory measurements and numerical analyses. However, ignorance of salinity may result in overestimation of stability, and the design may not be as conservative as thought. Therefore, this research aims to first experimentally examine the influence of pore water salinity on water retention curve and saturated permeability of natural dispersive loess under saline and desalinated conditions. Second, the measured parameters are used …
Analytical Method To Estimate The Influence Of Foundation Pit Excavation Adjacent To The Station (Working Shaft) On The Underlying Shield Tunnel, Zu-Xian Wang, Cheng-Hua Shi, Chen-Jie Gong, Cheng-Yong Cao, Jian-Wen Liu, Zhu Peng
Analytical Method To Estimate The Influence Of Foundation Pit Excavation Adjacent To The Station (Working Shaft) On The Underlying Shield Tunnel, Zu-Xian Wang, Cheng-Hua Shi, Chen-Jie Gong, Cheng-Yong Cao, Jian-Wen Liu, Zhu Peng
Rock and Soil Mechanics
The shield tunnel is typically simplified as an infinite beam with two free ends in existing analytical models, which are used to calculate the longitudinal deformation of the underlying shield tunnel induced by the excavation of a foundation pit. However, the applicability of those analytical models is limited due to the simplification. The current study is aimed at estimating analytically the longitudinal deformation of the underlying shield tunnel induced by the excavation of a foundation pit adjacent to the station (working shaft). The constraint on the shield tunnel generated by the joint between the station (working shaft) and the tunnel …
Progressive Failure Strength Characteristics Of Anisotropic Rocks Caused By Mineral Directional Arrangement: A Case Of Biotite Quartz Schist, Han Bao, Zhi-Yang Chen, Heng-Xing Lan, Run-Sheng Pei, Fa-Quan Wu, Chang-Gen Yan, Yue Tao
Progressive Failure Strength Characteristics Of Anisotropic Rocks Caused By Mineral Directional Arrangement: A Case Of Biotite Quartz Schist, Han Bao, Zhi-Yang Chen, Heng-Xing Lan, Run-Sheng Pei, Fa-Quan Wu, Chang-Gen Yan, Yue Tao
Rock and Soil Mechanics
To explore the strength characteristics of anisotropic rocks caused by mineral directional arrangement during progressive failure process, biotite quartz schist was taken as an example, and triaxial compression tests were carried out on samples with schistosity angles of 0°, 45° and 90°. The macro and micro failure characteristics and progressive failure strength index of the specimens were analyzed, and the differences with other types of anisotropic rock were discussed. The results show that the failure characteristics of biotite quartz schist are closely related to its schistosity. With the schistosity angle increasing from 0° to 90°, the main macro and micro …
Multi-Scale Analysis Of Damage Evolution Of Freezing-Thawing Red Sandstones, Hui-Mei Zhang, Yun-Fei Wang
Multi-Scale Analysis Of Damage Evolution Of Freezing-Thawing Red Sandstones, Hui-Mei Zhang, Yun-Fei Wang
Rock and Soil Mechanics
We take red sandstone as the research object and apply the freeze-thaw cycles, CT scans and mechanical properties experiments. We use image processing technology combined with genetic algorithm optimization model to achieve the denoise, enhancement, segmentation and three-dimensional reconstruction of CT scan images after 0, 5, 10, 20, and 40 freeze-thaw cycles. With the damage identification and comparative study of the same object across scales, we established a prediction formula of elastic modulus deterioration based on mesoscopic damage. Therefore, the macroscopic mechanical behavior of freeze-thaw red sandstones can be interpreted from the physical nature of the material meso-structure. The results …
Reliability Analysis Of Slope Under Rainfall Infiltration Considering Preferential Flow Model, Yun-Qi Yao, Run-Qiang Zeng, Jian-Hua Ma, Xiang-Pei Meng, Hong Wang, Zong-Lin Zhang, Xing-Min Meng
Reliability Analysis Of Slope Under Rainfall Infiltration Considering Preferential Flow Model, Yun-Qi Yao, Run-Qiang Zeng, Jian-Hua Ma, Xiang-Pei Meng, Hong Wang, Zong-Lin Zhang, Xing-Min Meng
Rock and Soil Mechanics
Rainfall-induced landslides are the most common geological hazard in the world, and the effect of preferential flow infiltration has been neglected for a long time regarding the slope reliability analysis under rainfall infiltration. The preferential infiltration under rainfall conditions is solved numerically by Comsol Multiphysics, and the slope factor of safety is calculated using an infinite slope model. An improved Cholesky decomposition method is applied to generate spatially correlated random fields, and the slope reliability during rainfall is analyzed using the Monte Carlo method. Combining the deterministic and reliability results to compare the variation of slope factor of safety between …
Macroscopic And Microscopic Experimental Study On Fractal Fragmentation Characteristics Of Calcareous Sand During One-Dimensional Compression Creep, Bin Chen, Jian Deng, Jie-Ming Hu, Jian-Lin Zhang, Tao Zhang
Macroscopic And Microscopic Experimental Study On Fractal Fragmentation Characteristics Of Calcareous Sand During One-Dimensional Compression Creep, Bin Chen, Jian Deng, Jie-Ming Hu, Jian-Lin Zhang, Tao Zhang
Rock and Soil Mechanics
Calcareous sand is a natural foundation material for ports, airports and some civil buildings in ocean areas. Through the one-dimensional compression creep test of calcareous sand and the analysis of its micro-structure, it was found that the surface pore area decreased after creep and showed a dispersed distribution. In addition, the characteristics of instantaneous deformation, rapid deformation and attenuation deformation of the sample during the test were highly correlated with the particle size. The relative particle breakage rate and mass fractal dimension improved based on fractal theory were used to describe the degree of particle breakage after creep. The relationship …
Rapid Prediction Method Of Soil-Water Characteristic Curve Of Yan’An Compacted Loess, Hai-Man Wang, Wan-Kui Ni, Kui Liu
Rapid Prediction Method Of Soil-Water Characteristic Curve Of Yan’An Compacted Loess, Hai-Man Wang, Wan-Kui Ni, Kui Liu
Rock and Soil Mechanics
The traditional SWCC test method is time-consuming, and it is of great practical significance to develop a method that can quickly determine the SWCC of unsaturated soil. In order to predict the SWCC of compacted loess rapidly, the water potential and moisture content of compacted loess with different dry densities were tested, and the pore size distribution curve was measured using nuclear magnetic resonance (NMR) technology. Based on the test results, a rapid prediction method of the soil-water characteristic curve of Yan’an compacted loess was established based on the void ratio, and its accuracy was verified by the measured data. …
Experimental Study On Crack Evolution And Damage Characteristics Of Water Bearing Sandstone Under Cyclic Loading, Ke Yang, Zhai-Nan Zhang, Xiao-Lou Chi, Xin L, Zhen Wei, Wen-Jie Liu
Experimental Study On Crack Evolution And Damage Characteristics Of Water Bearing Sandstone Under Cyclic Loading, Ke Yang, Zhai-Nan Zhang, Xiao-Lou Chi, Xin L, Zhen Wei, Wen-Jie Liu
Rock and Soil Mechanics
Based on the engineering background that rock masses of underground reservoirs in mines are frequently disturbed by cyclic loads such as mine earthquake and mining stress, uniaxial compression and cyclic loading tests for sandstones with different water contents were carried out in laboratory. The crack propagation and failure laws of sandstones with different water contents were revealed by digital speckle technique. Based on scanning electron microscopic (SEM) analysis, the micro deterioration mechanism of sandstones with different water contents under cyclic loading was obtained. The test results show that the peak strength of sandstone decreases gradually with the increase of water …
Energy Evolution And Failure Characteristics Of Single Fissure Carbonaceous Shale Under Drying−Wetting Cycles, Xin-Xi Liu, Yu Li, Zi-Jian Fan, Sheng-Nan Li, Wei-Wei Wang, Peng Dong
Energy Evolution And Failure Characteristics Of Single Fissure Carbonaceous Shale Under Drying−Wetting Cycles, Xin-Xi Liu, Yu Li, Zi-Jian Fan, Sheng-Nan Li, Wei-Wei Wang, Peng Dong
Rock and Soil Mechanics
In order to investigate the energy evolution and failure characteristics of carbonaceous shale containing single fissure under drying−wetting cycles, the intact carbonaceous shale samples and the carbonaceous shale samples with fissure angles of 30°, 45° and 60° were prepared. MTS815 rock mechanics test system was used to conduct triaxial compression tests under different drying−wetting cycles. The influence of drying−wetting cycles on the strength, failure mode and energy evolution of single fissure carbonaceous shale were studied. The results show that the elastic energy and dissipated energy at crack initiation stress, damage stress and peak stress present exponential relationships with drying-wetting cycles. …
Stochastic Seismic Response Analysis Of Engineering Site Considering Correlations Of Critical Soil Dynamic Parameters, Zi-Lan Zhong, Yue-Bo Shi, Jin-Qiang Li, Mi Zhao, Xiu-Li Du
Stochastic Seismic Response Analysis Of Engineering Site Considering Correlations Of Critical Soil Dynamic Parameters, Zi-Lan Zhong, Yue-Bo Shi, Jin-Qiang Li, Mi Zhao, Xiu-Li Du
Rock and Soil Mechanics
This paper presents a method to generate random samples of soil dynamic shear modulus and dynamic damping curves with full consideration of the correlations of critical soil dynamic parameters to investigate the influence of their uncertainties on the engineering site seismic response in the implementation of equivalent linear method. A one-dimensional (1D) equivalent linear site seismic response analysis program, which serves stochastic dynamic response analysis of the engineering site, has been developed in MATLAB. A 1D free field model for the typical layered engineering sites of site class II is established in this study. The target response spectra, which are …
Mechanical Response Characteristics Of Lining Structure Of Pipeline Karst Tunnels In Water-Rich Areas, Hao-Bo Fan, Ding-Kun Zhou, Yong Liu, Yu-Xiang Song, Zheng-Guo Zhu, Yong-Quan Zhu, Xin-Qiang Gao, Jia-Qi Guo
Mechanical Response Characteristics Of Lining Structure Of Pipeline Karst Tunnels In Water-Rich Areas, Hao-Bo Fan, Ding-Kun Zhou, Yong Liu, Yu-Xiang Song, Zheng-Guo Zhu, Yong-Quan Zhu, Xin-Qiang Gao, Jia-Qi Guo
Rock and Soil Mechanics
For the karst tunnel with pipeline cavities in the surrounding rock, it is very easy to accumulate high water pressure in the pipeline cavity due to the influences of heavy rainfall on the surface and groundwater, which will lead to lining cracking, water leakage, and water gushing diseases. To explore the influence of high water pressure on the lining structure, model tests of pipeline karst tunnels under high water pressure were carried out, and the internal force characteristics of tunnel lining under the influence of cavity position and water head height were studied. Based on the test findings, the numerical …