基于三维模型构建新方法的块石形状效应下S-RM宏细观剪切力学行为

doi:10.13722/j.cnki.jrme.2021.0988

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摘要为研究块石形状效应下土石混合体(S-RM)剪切力学行为，基于CT技术与球谐级数提出三维块石几何形态构建新方法，生成具有不同形状(类球状、扁长状、扁平状与片状)但具有相同凸度与棱角度的块石，并根据改进的不重叠颗粒簇生成方法构建可提高计算效率的三维块石离散元模型，并开展不同块石形状及破碎性的S-RM直剪数值试验，深入分析S-RM宏细观剪切力学特性并揭示块石形状影响机制。研究表明：类球状与扁长状块石咬合程度、滑移摩擦程度及旋转量均大于扁平状与片状块石；块石破碎虽然增加了块石咬合与旋转程度，但减小了块石的滑移摩擦程度；在块石摩擦滑移与旋转运动联合作用影响下，类球状软岩块石破碎程度最大而片状块石最小，类球状与扁长状块石S-RM的抗剪强度与剪胀性均大于扁平状与片状块石；由于类球状与扁平状软岩块石破碎程度较大，其S-RM强度非线性较扁长状与片状块石S-RM更强；由于类球状与扁长状块石的咬合程度较大，其S-RM峰值内摩擦角大于扁平状与片状块石S-RM。

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	章涵1
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	向国梁1
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	王乐华1
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	邓华锋1
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	赵二平1
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关键词 ：土力学, 土石混合体, 块石形状, 三维模型构建方法, 宏观力学行为, 细观损伤机制

Abstract：In order to study the effect of block form on the shear mechanical behaviors of the soil-rock mixture(S-RM)，a novel 3D block geometry modelling approach is proposed on the basis of CT technology and spherical harmonic series，for generating blocks with different forms(spheroidal，prolate，oblate and blade) but same convexity and angularity. Based on the improved non-overlapping cluster generation method，the 3D DEM block models，characterized by a higher computational efficiency，are established. The numerical direct shear tests were performed on S-RM models with different block shapes and breakable characteristics. The maro- and meso- mechanical properties of S-RM were deeply analyzed and the effect mechanism of block form was revealed. The results show that the occlusion，sliding friction degree and rotation magnitude of the spheroidal and prolate blocks are larger than those of the oblate and blade ones. The breakage of block increases the degree of block occlusion and rotation，but reduces its sliding friction degree. Under the combined effect of sliding friction and rotation of blocks，the breakage degrees of spheroidal blocks are the largest while the blade ones are the smallest，and the shear strength and dilation of S-RM with spheroidal and prolate blocks are larger than those with oblate and blade ones. Due to the breakage degrees of the spheroidal and oblate blocks are larger，the S-RM nonlinear characteristics of strength are more obvious than those of the S-RM with prolate and blade blocks. Due to the occlusion degrees of the spheroidal and prolate blocks are larger，the peak frictional angles of S-RM are larger than those of the S-RM with oblate and blade blocks.

Key words： soil mechanics soil-rock mixture block form 3D modelling approach macro-mechanical behaviors meso-breakage mechanism

引用本文:

章涵1，2，向国梁1，2，王乐华1，2，邓华锋1，2，赵二平1，2. 基于三维模型构建新方法的块石形状效应下S-RM宏细观剪切力学行为[J]. 岩石力学与工程学报, 2022, 41(10): 2030-2044.
ZHANG Han1，2，XIANG Guoliang1，2，WANG Lehua1，2，DENG Huafeng1，2，ZHAO Erping1，2. Effect of block form on the shear marco- and meso-mechanical behaviors of S-RM based on 3D novel modelling approach. , 2022, 41(10): 2030-2044.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0988 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I10/2030

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