基于细观力学脆性岩石剪切特性演化模型研究

LI Xiao-zhao; QI Cheng-zhi; SHAO Zhu-shan; QU Xiao-lei

doi:10.16285/j.rsm.2017.2443

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基于细观力学脆性岩石剪切特性演化模型研究

更新时间：2026-06-25

- 基于细观力学脆性岩石剪切特性演化模型研究
- Vol. 40, Issue 4, Pages: 1358-1367(2019)
- 作者机构：
  
  1. 北京建筑大学土木与交通工程学院北京未来城市设计高精尖创新中心
  2. 西安建筑科技大学土木工程学院
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.2443
  CLC： TU452
- Published：2019
- 稿件说明：
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[1]李晓照,戚承志,邵珠山,屈小磊.基于细观力学脆性岩石剪切特性演化模型研究[J].岩土力学,2019,40(04):1358-1367.

LI Xiao-zhao, QI Cheng-zhi, SHAO Zhu-shan, et al. 基于细观力学脆性岩石剪切特性演化模型研究[J]. 2019, 40(4): 1358-1367.
[1]李晓照,戚承志,邵珠山,屈小磊.基于细观力学脆性岩石剪切特性演化模型研究[J].岩土力学,2019,40(04):1358-1367. DOI： 10.16285/j.rsm.2017.2443.

LI Xiao-zhao, QI Cheng-zhi, SHAO Zhu-shan, et al. 基于细观力学脆性岩石剪切特性演化模型研究[J]. 2019, 40(4): 1358-1367. DOI： 10.16285/j.rsm.2017.2443.

摘要

压缩作用下岩石内部细观裂纹扩展导致岩石产生损伤

其对岩石变形、强度等力学特性有着重要影响;然而

岩石内部裂纹扩展与剪切特性（黏聚力、内摩擦角及剪切应力）动态演化关系很少被研究。基于裂纹扩展机制推出的岩石应力-应变本构模型

并结合摩尔-库仑失效准则

推出了在岩石应力-应变关系峰值应力（对应岩石压缩强度）状态时

本构模型细观力学参数与岩石黏聚力、内摩擦角及剪切强度之间的状态关系。然后

引入岩石应力-应变本构关系塑性变形阶段服从摩尔-库仑屈服准则的力学流动规律

进而将已推出的应力-应变关系峰值状态点所满足的细观力学参数与黏聚力、内摩擦角关系

推广到岩石进入塑性变形后

岩石内部裂纹扩展（或应变）与黏聚力、内摩擦角及剪切应力动态演化的理论关系。随着裂纹扩展或应变增加

黏聚力、内摩擦角及剪切应力先增大

达到一个峰值点后减小

该结果与应力-应变本构曲线变化趋势相对应。通过试验结果验证了所提出理论结果的合理性。并讨论了初始裂纹之间摩擦系数对黏聚力、内摩擦角及剪切应力随裂纹扩展或应变演化规律的影响。

Abstract

The damage of brittle rock is induced by its microcrack growth which significantly affects the deformation and strength of rocks subjected to the compressive loadings. However

the relationships between microcrack growth and the variable shear properties（cohesion

internal friction angle

and shear stress） are rarely studied. In this study

the relationships between internal friction angle

cohesion

shear strength and micro-parameters at the peak point of stress-strain relationship are proposed

according to the stress-strain relationship triggered by crack growth and the Mohr-Coulomb failure criterion. By introducing the Mohr-Coulomb yield criterion

the theoretical expression is established for dynamic variations of cohesion

internal friction angle and shear stress along with microcrack growth or strain at plastic deformation phase of brittle rocks. Cohesion

internal friction angle

and shear stress firstly increase until to maximum values

and then decrease with the increasing crack growth or axial strain in brittle rocks under compressive loading

which is corresponding to the stress-strain constitutive curves in triaxial compressive tests. Finally

the rationality of the proposed theoretical expression is verified by comparing with the experimental results. Besides

the effects of friction coefficient between microcrack interfaces on the relationships between cohesion

internal friction angle

shear stress and crack growth or axial strain are discussed.

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Related Institution

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