Anisotropy mechanism of shear strength based on wear and shear failure evolution of asperities of joint surface

SONG Lei-bo; KANG Qian-qian; DU Shi-gui; ZHONG Zhen; WANG Gang; WANG Xing-kai; HAN Guan-sheng; ZHAO Jin-shuai

doi:10.16285/j.rsm.2021.0100

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Anisotropy mechanism of shear strength based on wear and shear failure evolution of asperities of joint surface

更新时间：2026-06-25

- Anisotropy mechanism of shear strength based on wear and shear failure evolution of asperities of joint surface
- Vol. 42, Issue 9, Pages: 2331-2343(2021)
- 作者机构：
  
  1. 绍兴文理学院土木工程学院,浙江,绍兴,312000
  2. 绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江,绍兴,312000
  3. 江苏大学土木工程与力学学院,江苏,镇江,212013
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.0100
  CLC： TU45
- Online First：26 August 2021，
  
  Published：2021
- 稿件说明：
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SONG Lei-bo, KANG Qian-qian, DU Shi-gui, et al. Anisotropy mechanism of shear strength based on wear and shear failure evolution of asperities of joint surface[J]. 2021, 42(9): 2331-2343.
DOI：

SONG Lei-bo, KANG Qian-qian, DU Shi-gui, et al. Anisotropy mechanism of shear strength based on wear and shear failure evolution of asperities of joint surface[J]. 2021, 42(9): 2331-2343. DOI： 10.16285/j.rsm.2021.0100.

摘要

为了从剪切磨损角度探索剪切强度各向异性的机制，定量分析了粗糙节理在不同法向应力下的强度特征与破坏特征。研究发现，节理的剪切强度和破坏体积表现出与形貌特征相似的各向异性特征，且两者的各向异性特征随着法向应力的增加而逐渐削弱。另外，调查了锯齿节理的倾角特征和高度特征对剪切行为的影响。分析表明：两者都与剪切强度存在正相关的关系，且倾角特征还决定了剪切过程中节理接触区域的局部性。粗糙节理的表面由很多微凸体组成，不同剪切方向上表面接触区域的不同以及该区域内微凸体高度特征和倾角特征的差异是造成剪切强度各向异性的本质原因。而随着法向应力的增加，节理表面越来越多的微凸体的破坏由滑移磨损演化为剪断破坏，在不同剪切方向上破坏体积的差异也逐渐减小，进而导致剪切所需的能量逐渐趋于一致，这是剪切强度各向异性特征被法向应力削弱的主要原因。

Abstract

To explore the anisotropy mechanism of joint shear strength from its damage characteristics

shear strength and failure characteristics were quantitatively analyzed. The study found that the shear strength and failure characteristics of joint show similar anisotropy with its morphology

and their anisotropy is weakened with the increase of normal stress. In addition

the influence of the inclination and height characteristics of the sawtooth joints on the shearing behavior was investigated. The analysis shows the angle and height characteristics of asperities have a positive correlation with shear strength

and the angle characteristics also determine the locality of asperities contact state during the shear process. The rough joint surface is composed of many microscopic asperities. The essential reason for the anisotropy of shear strength is the different contact area on the joint surface in different shear directions and the difference of asperities height and dip angle in the contact area. With the increase of normal stress

the failure of more and more micro convex bodies on the joint surface evolves from sliding wear to shear failure

and the difference of failure volume in different shear directions gradually decreases

which leads to the gradual consistency of the energy required for shear

which is the main reason why the anisotropic characteristics of shear strength are weakened by normal stress.

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