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Effect of seepage-induced erosion on soil macropore structure

Journal of Mountain Science 2023年第11期20卷 3402-3422页

作者： HUANG Wen-bo HUANG Da GAO Yi-kang LIU Yang LI Zhao MENG Qiu-jie School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China. College of Geology Engineering and Geomatics Chang’an UniversityXi’an 710054China.

Internal erosion is one of the important factors causing geological disasters.The microstructure of soil can change with seepage erosion,resulting in changes in the hydraulic and mechanical properties of the soil.The evolution of seepage erosion is investigated with X-ray computed tomography(CT)in this study.The change in macropore structure characteristics during the seepage erosion test is quantified and the influence of seepage erosion on soil deformation is analyzed.Moreover,a pore network model(PNM)is established for the specimens and the evolution of the connected pore size characteristics is assessed.The results show that the macropore structure is significantly affected by seepage erosion,especially in terms of the porosity and pore geometry characteristics.The changes in macropore structure characteristics are most obvious in the lower part of the specimen.The influence of seepage erosion on the pore size distribution(PSD)and soil deformation is heterogeneous and closely dependent on the spatial location of the soil.Moreover,seepage erosion enhances macropore connectivity and has a directional impact on macropore orientation.These findings can provide a reference for the theoretical modeling and numerical simulation of the seepage erosion and improve the understanding of the seepage erosion evolution in engineering practice.

关键词： Seepage erosion Heterogeneity macropore structure Pore size distribution Microstructure CT scanning

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Mechanical characteristics of soil-rock mixtures containing macropore structure based on 3D modeling technology

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Journal of Mountain Science 2020年第9期17卷 2224-2240页

作者： LIU Yong SUN Shao-rui WEI Ji-hong SONG Jing-lei YU Yong-xiang HE Wei ZHANG Ji-xing School of Earth Science and Engineering Hohai UniversityNanjing 211100China Jiangsu Province Geological Survey Institute Nanjing 210018China

Soil-rock mixtures containing macropore(SRMCM)is a kind of geological material with special mechanical properties.Located in the project area of Lenggu hydropower station on the Yalong River,Sichuan Province,China,there is an extremely unstable Mahe talus slide with a total volume of nearly160 million cubic meters,which is mainly composed of SRMCM.The study on the mechanical properties of SRMCM is of great significance for the engineering construction and safe operation.In this paper,laboratory tests and discrete element numerical tests based on three-dimensional scanning technology were conducted to study the influence of stone content,stone size,and the angle of the macropore structure on shear characteristics of SRMCM.The failure mechanism of SRMCM was discussed from a microscopic perspective.This work explains the internal mechanism of the influence of stone content,stone size,and the angle of the macropore structure on the strength of SRMCM through the microscopic level of stone rotation,force chain distribution,and crack propagation.As the macropore structure that intersects with the preset shear plane at a large angle could act as a skeleton-like support to resist the shear force,the fracture of the weak cemented surface of soil and stone in the macropore structure is an important cause of SRMCM destruction.

关键词： Soil rock mixtures macropore structure Mechanical characteristics Discrete element method Shear band

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