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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

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

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

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

In-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 *** 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