三轴剪切下砂土应变局部化宏微观特性演化规律离散元分析

doi:10.13722/j.cnki.jrme.2023.0188

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摘要探究土体变形和剪切带空间演化特征对于评估岩土结构的稳定性具有重要意义。使用离散元法模拟砂土在柔性边界下三轴剪切试验，分析剪切带内外的宏微观特性演化规律，探究砂土应变局部化的宏微观跨尺度联系。首先，在离散元模拟中使用考虑颗粒形状影响的三维完整接触模型；随后，在三轴模拟中使用柔性边界代替刚性边界以保证剪切带的充分发展；最后，与已有试验进行对比验证模拟有效性，并从宏微观关联角度对其结果进行分析。结果表明：使用考虑颗粒形状影响的三维完整接触模型及柔性边界的三轴离散元模拟可以较好的再现净砂试样的应力–应变和体积响应及剪切带的发展过程；剪切带内外部的平均纯转动率(APR)值、孔隙率、力学配位数、各向异性系数等宏微观特征差异明显；随着轴向位移的增加，带内APR值、孔隙率均大于带外而力学配位数带外大于带内；剪切带内局部孔隙率及各项异性对试样整体孔隙演化和各向异性有重要影响。

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	王思远1
	蒋明镜2
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	石安宁1

关键词 ：土力学, 离散元模拟, 柔性边界, 应变局部化, 三轴压缩, 宏微观特性

Abstract：It is very important for evaluating the instability of geotechnical structures to investigate soil deformation and the spatial evolution of shear bands. For this aim，this paper employs the distinct element method(DEM) to simulate conventional triaxial tests on sand with flexible boundaries，analyzes the evolution of macroscopic and microscopic characteristics within and outside the shear bands，and tries to establish an upscale association between the macro and micro behaviors. Firstly，the DEM employed a complete microscopic contact model that accounts for the effect of particle shape on the macro-mechanical response by incorporating rolling and twisting resistances. Secondly，a flexible membrane boundary was used in the simulations of triaxial compression tests to enable the complete development of the shear band. Finally，the DEM simulation results were compared with the experimental results available，and analyzed from the macro and micro viewpoints. The DEM results indicate that the employment of the complete contact model and flexible boundaries is able to accurately reproduces stress-strain and volume responses of the sand sample and capture the evolution of the shear band in the simulations. There are significant differences in the average particle rotation rate(APR)，porosity，mechanical average coordination numbers，and anisotropy coefficients within and outside shear bands. With the increase of axial strain，the APR and porosity inside the shear band are larger than the outside，on the contrary，the mechanical average coordination number outside the shear band is greater than the inside. In addition，the local porosity and anisotropy within the shear band have significant influences on the global evolution of void and anisotropy in the sand sample.

Key words： soil mechanics DEM simulation flexible membrane strain localization triaxial compression macro and micro characteristics

引用本文:

王思远1，蒋明镜2，3，4，石安宁1. 三轴剪切下砂土应变局部化宏微观特性演化规律离散元分析[J]. 岩石力学与工程学报, 2024, 43(S1): 3586-3596.
WEANG Siyuan1，JIANG Mingjing2，3，4，SHI Anning1. Discrete element analysis of the evolution of macro and micro characteristics of strain localization in the sand under triaxial shear. , 2024, 43(S1): 3586-3596.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0188 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3586

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