Study on rock crack damage and confining pressure effects
on shear fracture band

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

doi:10.16285/j.rsm.2018.1434

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Study on rock crack damage and confining pressure effects on shear fracture band

更新时间：2026-06-25

- Study on rock crack damage and confining pressure effects on shear fracture band
- Vol. 40, Issue 11, Pages: 4249-4258(2019)
- 作者机构：
  
  1. 北京建筑大学土木与交通工程学院,北京,100044
  2. 北京未来城市设计高精尖创新中心,北京,100044
  3. 西安建筑科技大学土木工程学院,陕西,西安,710055
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.1434
  CLC： TU452
- Online First：13 November 2019，
  
  Published：2019
- 稿件说明：
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LI Xiao-zhao, SHAO Zhu-shan, QI Cheng-zhi. Study on rock crack damage and confining pressure effects on shear fracture band[J]. 2019, 40(11): 4249-4258.
DOI：

LI Xiao-zhao, SHAO Zhu-shan, QI Cheng-zhi. Study on rock crack damage and confining pressure effects on shear fracture band[J]. 2019, 40(11): 4249-4258. DOI： 10.16285/j.rsm.2018.1434.

摘要

岩石内部细观裂纹的存在，对压缩作用下岩石剪切断裂的宏观现象有着重要的影响。然而，能够通过解析解阐释细观裂纹几何特性、围压等影响因素对压缩作用下剪切断裂面角度变化趋势的研究很少。基于Ashby模型中提出的裂纹尖端应力强度因子，提出了一种改进的考虑裂纹角度影响的应力强度因子表达式。利用该改进的应力强度因子表达式，推出了一个可以预测岩石峰值强度的裂纹扩展、应变与应力之间的本构关系。结合本构关系的峰值强度与摩尔-库仑失效准则，得到了岩石损伤与内摩擦角、黏聚力、剪切强度及失效断裂面角度之间的理论关系；讨论了围压、裂纹尺寸、角度及摩擦系数对岩石宏观剪切断裂面角度的影响，通过试验结果验证了模型合理性。结果表明：随着损伤增大，内摩擦角、黏聚力及剪切强度不断减小；随着围压增大、摩擦系数增大和初始裂纹尺寸减小，剪切断裂面角度不断增大；随着裂纹角度增大，剪切断裂纹面角度先减小后增大。

Abstract

Existence of rock microcracks has great influence on rock shear fracture under compressive loadings. However

the effects of microcrack geometries and confining pressures on shear fracture angle are rarely studied in rocks. In this study

an improved expression of stress intensity factor containing crack angle effect is derived

which is based on the proposed expression at crack tips in Ashby’s microcrack model. Using this improved stress intensity factor

the constitutive relationship between crack growth

strain and stress is obtained

and it predicts the peak strength in rocks. Coupling this constitutive relationship at state of peak strength and Mohr-Coulomb failure criterion

the correlations of internal friction angle

cohesion

shear strength and damage are obtained. Effects of confining pressure

initial crack size

crack angle and friction coefficient on shear fracture angle are discussed. The rationality of theoretical model is verified with experimental data. The results show that internal friction angle

cohesion and shear strength decrease with increment of damage; shear fracture angle increases with the increment of confining pressure and friction coefficient

or the decrement of initial crack size; shear fracture angle decreases firstly

and then increases with increment of crack angle.

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