Shear mechanical behavior of rock with through-type saw-tooth joints

LIU Xinrong; ZENG Xi; XU Bin; ZHOU Xiaohan; LIU Xinlin; WANG Jiwen

doi:10.11835/j.issn.2096-6717.2021.195

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Shear mechanical behavior of rock with through-type saw-tooth joints

Civil Engineering | 更新时间：2023-09-19

- Shear mechanical behavior of rock with through-type saw-tooth joints
- Journal of Civil and Environmental Engineering Vol. 45, Issue 5, Pages: 1-9(2023)
- 作者机构：
  
  重庆大学土木工程学院
  库区环境地质灾害防治国家地方联合工程研究中心
  山地城镇建设与新技术教育部重点实验室，重庆 400045
- 作者简介：
  
  LIU Xinrong (1969- ), professor, doctorial supervisor, main research interests: rock mechanics and underground engineering, E-mail: liuxrong@126.com.
  XU Bin （corresponding author）, PhD candidate, E-mail: geotechnicale2016@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(41972266;52074042);the Graduate Scientific Research and Innovation Foundation of Chongqing, China(CYS21024);Basic Research and Frontier Exploration Project of Chongqing in 2018(cstc2018jcyjAX0453)
- DOI：10.11835/j.issn.2096-6717.2021.195
  CLC： TU458
- Received：04 June 2021，
  
  Published：25 October 2023
- 稿件说明：
移动端阅览
LIU Xinrong, ZENG Xi, XU Bin, et al. Shear mechanical behavior of rock with through-type saw-tooth joints[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 1-9.
DOI：

LIU Xinrong, ZENG Xi, XU Bin, et al. Shear mechanical behavior of rock with through-type saw-tooth joints[J]. Journal of Civil and Environmental Engineering, 2023, 45(5): 1-9. DOI： 10.11835/j.issn.2096-6717.2021.195.

摘要

为探究一阶起伏角和法向应力对贯通型锯齿状节理岩体剪切强度及变形的影响规律，在不同法向应力作用下对含不同一阶起伏角的锯齿节理试样进行室内直剪试验，建立一个贯通型锯齿状节理岩体剪切强度估算公式并进行验证。结果表明：相同法向应力作用下，根据其形态特征的不同，剪切应力-位移曲线分为滑动型曲线、滑动-峰值型曲线和峰值型曲线3类，滑动型曲线和滑动-峰值型曲线可分为非线性缓慢上升阶段、线性陡升阶段、“上凸形”缓慢上升阶段、近似平直阶段和平直阶段，峰值型曲线可分为非线性缓慢上升阶段、线性陡升阶段、“微凸型”上升阶段、脆性跌落阶段和波动缓降阶段；根据起伏角的不同，锯齿节理岩体的破坏模式可概化为滑移破坏、爬坡破坏和爬坡啃断破坏，每种破坏模式下节理损伤演化过程均可分为3个阶段，即滑移破坏模式可分为压密阶段、克服摩擦阶段和滑移阶段，爬坡破坏模式可分为压密阶段、爬坡滑移阶段和塑性流动阶段，爬坡啃断破坏模式可分为压密爬坡阶段、爬坡啃断阶段和啃断滑移阶段；含不同一阶起伏角的锯齿节理岩体剪切强度均随法向应力和起伏角的增加而增大，其计算表达式仍然遵循M-C准则。

Abstract

To explore the effect of undulating angle and normal stress on the shear strength and deformation of the rock with regular saw-tooth joints

direct shear tests were carried out on the limestone samples with different undulating angles under different normal stresses. Subsequently

a shear strength estimation formula was established and verified. The results show that

under the same normal stress

according to the morphological characteristics，the shear stress-displacement curves can be divided into three types：the sliding curve

the sliding-peak curve and the peak curve. The sliding curve and the sliding-peak curve can be divided into nonlinearly slow rising

linear steep rising

and “upward convex” slow rising stage

approximately straight and flat stage. The peak type curve can be divided into nonlinearly slow rising

linear steep rising

“slightly convex” rising

brittle falling and gently descending stage. The failure mode of rock with saw-tooth joints with different undulating angles can be generalized into three failure modes: sliding failure

climbing failure and gnawing failure. The evolution of joint damage under each failure mode can be divided into three stages

i.e.

the sliding failure mode can be divided into compaction

friction-over-coming and sliding stage. The climbing failure mode can be divided into compaction

climbing-sliding and plastic flow stage. The gnawing failure modes can be divided into compaction-climbing

climbing-gnawing and gnawing-sliding stage. The shear strength increases with the increase of the normal stress and undulating angle

and the evolution of shear strength still follows M-C criterion.

关键词

Keywords

references

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