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Fracture evolution analysis of soil-rock mixture in contrast with soil by CT scanning under uniaxial compressive conditions

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Science China(Technological Sciences) 2021年第12期64卷 2771-2780页

作者： SUN XiuKuo LI Xiao MAO TianQiao ZHENG Bo WU YanFang LI GuanFang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

soil-rock mixture(SRM),as a type of extremely heterogeneous geomaterial,is very common in nature and *** fracture and damage of SRM often induce severe geological ***,it is important to analyze the fracture evolution process of this *** the present research,real-time computed tomography(CT)scanning was conducted on SRM and pure soil samples under uniaxial compressive experiments to investigate the influence of rocks on fracture evolution in *** initiation of cracks,the original values of,and variations in,average density and heterogeneity in the soil matrix,the crack width evolution during loading,and the final failure modes were all *** with a width greater than 0.1 mm will not arise until over 90%of ultimate stress is *** general,in SRM,areas where the initial average density of the soil matrix is smaller and the initial heterogeneity is greater,are much easier to crack,but the results for pure soil show the opposite *** to fracturing conditions shown in CT slices,fracturing and non-fracturing areas in the soil matrix were *** average density of the soil matrix decreases in all areas under loading,except non-fracturing areas in *** the whole sample,the increase in heterogeneity in the soil matrix of SRM is greater than that of pure soil;but for the fracturing areas,this increase in pure soil is ***,the average and standard deviations of crack width both follow logarithmic distributions with high correlation coefficients.

关键词： soil-rock mixture fracture evolution real-time CT scanning CT value crack width

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soil-water characteristic surface model of soil-rock mixture

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Journal of Mountain Science 2023年第9期20卷 2756-2768页

作者： WANG Kui HUI Ying ZHOU Chuan LI Xue RONG Yao Institute of Engineering Research Centre of Diagnosis Technology of Hydro-Construction Chongqing Jiaotong UniversityChongqing 400074China Changjiang Fuling Waterway Division Chongqing 408000China Institute of Jiangxi Transportation Institute Co. LtdNO.809 Jinsha AveXiaolan Economic Development ZoneNanchang 330200China

The relationship between the water content or saturation of unsaturated soils and its matrix suction is commonly described by the soilwater characteristic curve(SWCC).Currently,study on the SWCC model is focused on fine-grained soils like clay and silty soils,but the SWCC model for grinding soil-rock mixture(SRM)is less *** that the SRM is in a certain compaction state in the actual project,this study established a surface model with three variables of coupling compaction degree-substrate suction-moisture content based on the Cavalcante-Zornberg soil-water characteristic curve ***,the influence of each fitting parameter on the curve was *** the common SRM,the soil-water characteristic test was ***,the experimental measurements exhibit remarkable consistency with the mode *** analysis shows that the surface model intuitively describes the soil-water characteristics of grinding SRM,which can provide the SWCC of soils with bimodal pore characteristics under specific compaction ***,it can reflect the influence of compaction degrees on the SWCC of rock-soil mass and has a certain prediction *** SWCC of SRM with various soil-rock ratios have a double-step *** the increase in compaction degree,the curves as a whole tend toward decreasing mass moisture *** curve changes are mainly concentrated in the large pore section.

关键词： soil-rock mixture soil-water characteristic Surface model Compaction effect

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Experimental study on shear properties and resistivity change of soil-rock mixture

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Journal of Mountain Science 2024年第11期21卷 3930-3944页

作者： LIU Gang WANG Kui XIA Zhengting Engineering Research Centre of Diagnosis Technology of Hydro-Construction Chongqing Jiaotong UniversityChongqing 400074China Institute of Engineering Design&Research Chongqing Jiaotong University Chongqing 400074China

The deterioration of shear resistance in rock and soil masses has resulted in numerous severe natural disasters,highlighting the significance of long-term monitoring for disaster prevention and *** study explores the use of a non-destructive method to quickly and accurately evaluate the shear properties of soil-rock *** shear stress,shear strain,and resistivity of the soil-rock mixture were tested simultaneously using a combination of direct shear and resistivity *** test results show that the resistivity of the soil-rock mixture gradually decreases with increasing shear *** resistivity of all specimens ranged approximately from 60 to 130Ω.m throughout the shear *** the end of the shear test,the vertical failure resistivity showed an irregular“W”shape with increasing rock *** exhibited a significant negative linear functional relationship with the shear *** reference to the determination of cohesion and internal friction angle on the shear strength envelope,the horizontal angle of the vertical failure resistivity-normal stress curve is defined as the resistivity angle,and the intercept of the curve is the resistivity at the initial moment of *** has been observed that the resistivity angle is negatively and linearly correlated with the internal friction *** the same time,there is a linear growth relationship between resistivity at the initial moment of shear and *** has been demonstrated that an increase in rock content contributes to a general escalation in both the average structure factor and average shape ***,a decrease in the anisotropy coefficient has also been *** alterations are indicative of the extent of microstructural transformations occurring during the deformation process of the soil-rock *** research results verify the feasibility of real-time deformation monitoring and characterization of shear strength parameters using resistivity.

关键词： soil-rock mixture Shear properties Resistivity change Structural characteristic parameters Deformation monitoring

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Experimental Study on Seepage Characteristics of a soil-rock mixture in a Fault Zone

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Fluid Dynamics & Materials Processing 2022年第2期18卷 271-283页

作者： Pengfei Wang Xiangyang Zhang Key Laboratory of Safety and High-Efficiency Coal Mining Ministry of EducationAnhui University of Science and TechnologyHuainan232001China School of Architecture and Civil Engineering Huangshan UniversityHuangshan245041China

A mixture of fault gouge and rubble taken out from a fault zone is used to prepare a S-RM(soil-rock mixture)sample with rock block proportions of 20%,30%,40%,50%,60%and 70%,respectively.A GDS triaxial test system is used accordingly to measure the seepage characteristics of such samples under different loading and unloading confining pressures in order to determine the variation law of the permeability *** test results show that:(1)The permeability coefficient of the S-RM samples decreases as the pressure increases,and the decrease rate of this coefficient in the initial stage of confining pressure loading is obviously higher than in the semi-late period;(2)The permeability coefficient at different confining pressure levels presents a common trend as the rock block proportion is increased,i.e.,it decreases first then it increases(the permeability coefficient of the sample with rock block proportion 40%being the smallest,70%the largest);(3)In the stage of confining pressure unloading,the recovery degree of the permeability coefficient grows with the increase of rock block proportion(the recovery rate of S-RM sample with rock block proportion 70%reaches 50.2%);(4)In the stage of confining pressure loading and unloading,the sensitivity of the permeability coefficient to the rock block proportion displays the inverse“Z”variation rule(when rock block proportion reaches 60%,the sensitivity is highest);(5)In the stage of confining pressure loading,the relationship between the permeability coefficient and confining pressure can be described by an exponential relationship.

关键词： Fault zone rock block proportion soil-rock mixture confining pressure loading and unloading seepage characteristic

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Pore evolution and shear characteristics of a soil-rock mixture upon freeze-thaw cycling

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Research in Cold and Arid Regions 2023年第4期15卷 179-190页

作者： LiYun Tang ShiYuan Sun JianGuo Zheng Long Jin YongTang Yu Tao Luo Xu Duan School of Architecture and Civil Engineering Xi'an University of Science and TechnologyXi'anShaanxi 710054China China Jikan Research Institute of Engineering Investigations and Design Co. Ltd.Xi'anShaanxi 710043China State Key Laboratory of Road Engineering Safety and Health in High-altitude Regions CCCC First Highway Consultants Co.LtdXi'anShaanxi 710065China China United Northwest Institute for Engineering Design&Research Co Ltd.Xi'anShaanxi 710077China Key Laboratory of Safety and Durability of Concrete Structures of Shaanxi Xijing UniversityXi'anShaanxi 710123China

The changes in pore structure within soil-rock mixtures under freeze-thaw cycles in cold regions result in strength deterioration,leading to instability and slope ***,the existing studies mainly provided qualitative analysis of the changes in pore or strength of soil-rock mixture under freeze-thaw *** contrast,few studies focused on the quantitative evaluation of pore change and the relationship between the freeze-thaw strength deterioration and pore change of soil-rock *** study aims to explore the correlation between the micro-pore evolution characteristics and macro-mechanics of a soil-rock mixture after frequent freeze-thaw cycles during the construction and subsequent operation in a permafrost *** pore characteristics of remolded soil samples with different rock contents(i.e.,25%,35%,45%,and 55%)subjected to various freeze-thaw cycles(i.e.,0,1,3,6,and 10)were quantitatively analyzed using nuclear magnetic resonance(NMR).Shear tests of soil-rock samples under different normal pressures were carried out simultaneously to explore the correlation between the soil strength changes and pore *** results indicate that with an increase in the number of freeze-thaw cycles,the cohesion of the soil-rock mixture generally decreases first,then increases,and finally decreases;however,the internal friction angle shows no apparent *** the increase in rock content,the peak shear strength of the soil-rock mixture rises first and then decreases and peaks when the rock content is at 45%.When the rock content remains constant,as the number of freeze-thaw cycles rises,the shear strength of the sample reaches its peak after three freeze-thaw *** have shown that with an increase in freeze-thaw cycles,the medium and large pores develop rapidly,especially for pores with a size of 0.2–20μ***-thaw cycling affects the internal pores of the soil-rock mixture by altering its skeleton and,therefore,impacts its macro-mech

关键词： Freeze-thaw cycling soil-rock mixture NMR Pore change Shear strength

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Damage mechanism of soil-rock mixture after freeze-thaw cycles

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Journal of Central South University 2019年第1期26卷 13-24页

作者： ZHOU Zhong XING Kai YANG Hao WANG Hao School of Civil Engineering Central South University Department of Architecture and Civil Engineering City University of Hong Kong School of Civil Engineering Southeast University

As a widely distributed geological and engineering material,the soil-rock mixture always undergoes frequentative and short-term freeze-thaw cycles in some *** internal structure is destroyed seriously,but the damage mechanism is not *** on the damage factor,the damage research of properties of soil-rock mixture after different times of freeze-thaw cycles is ***,the size-distributed subgrade gravelly soil samples are prepared and undergo different times of freeze-thaw cycles periodically(0,3,6,10),and indoor large-scale triaxial tests are ***,the degradation degree of elastic modulus is considered as a damage factor,and applied to macro damage analysis of soil-rock ***,the mesoscopic simulation of the experiments is achieved by PFC3D,and the influence on strength between soil-rock particles caused by freeze-thaw cycles is *** results show that freeze-thaw cycles cause internal damage of samples by weakening the strength between mesoscopic soil-rock particles,and ultimately affect the macro *** freeze-thaw cycles,on the macro-scale,elastic modulus and shear strength of soil-rock mixture both decrease,and the decreasing degree is related to the times of cycles with the mathmatical quadratic form;on the meso-scale,freeze-thaw cycles mainly cause the degradation of the strength between soil-rock particles whose properties are different significantly.

关键词： soil-rock mixture freeze-thaw cycle large-scale triaxial test strength between soil-rock particles

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Physical simulation test of soil-rock mixture from synthetic transparent soil

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Journal of Central South University 2018年第12期25卷 3085-3097页

作者： DING Xiao-hua ZHOU Wei LU Xiang GAO Yan School of Mines China University of Mining&TechnologyXuzhou221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&TechnologyXuzhou221116China

The waste dump of open-pit coal mine is remade of soil-rock mixture under the action of gravity,dynamic load of transportation equipment and earthquake,*** using artificial synthetic transparent soil,the developing process and migration law for soil-rock mixture are observed in the remade *** mixture of fused quartz sand,liquid paraffin and n-tridecane is chosen as the material for synthetic transparent soil which is mixed with liquid paraffin and n-tridecane at a mass ratio of4.4at room temperature of17℃.Physical and mechanical properties of transparent soil are determined by physical test and compared with those in natural sandy *** results show that transparent soil and sandy soil have high similarity,in other words,transparent soil can be used for similar simulation experiments of soil-rock mixture.

关键词： transparent soil waste dump soil-rock mixture physical test

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Mechanical properties of material in a mine dump at the Shengli#1 Surface Coal Mine,China

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International Journal of Mining Science and Technology 2017年第3期27卷 545-550页

作者： Gao Shiyou Zhou Wei Shi Xuyang Cai Qingxiang Crusoe Garmondyu E.Jr. Jisen Shu Huang Yuejun School of Mines China University of Mining&TechnologyXuzhou 221116China Shenhua Beidian Shengli Energy Co.Ltd. Xilinhaote 026000China

ln-situ experiments were conducted to investigate the mechanical properties of the soil-rock mixture in the internal dump of the Shengli #1 Surface Coal Mine, China. Based on the experimental results, this study used comparative analysis and found that the shear strength of the soil-rock mixture in the dump was greater than the residual shear strength of the original rock. The results showed that the material presented in the dump as large blocks was the main factor affecting the strength of the soil-rock mixture, Numerical simulation was carried out for the analyses of three factors： different combinations of shear failure, rolling failure along with different large-block radius ratios, and mixture densities. The results illustrated that the cohesion and angle of internal friction of the soil-rock mixture are 12 kPa and 32.26°. However, in some cases the bench angle in the dump was controlled by a coupling relationship of rocks in the material. Finally, the stability of a soil slope showed a linear relationship with the large-block radius ratio and the bulk density.

关键词： Surface coal mine soil-rock mixture Residual strength In-situ experiment Mechanical model

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