Study of mechanical characteristics of simulated rock joints with second-order asperity under cyclic shear loading

ZHU Xiao-ming; LI Hai-bo; LIU Bo

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Study of mechanical characteristics of simulated rock joints with second-order asperity under cyclic shear loading

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- Study of mechanical characteristics of simulated rock joints with second-order asperity under cyclic shear loading
- Vol. 35, Issue 2, (2014)
- 作者机构：
  
  1. 甘肃省交通规划勘察设计院有限责任公司,兰州,730030
  2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU458+.3
- Online First：18 February 2014，
  
  Published：2014
- 稿件说明：
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ZHU Xiao-ming, LI Hai-bo, LIU Bo. Study of mechanical characteristics of simulated rock joints with second-order asperity under cyclic shear loading[J]. 2014, 35(2).
DOI：

ZHU Xiao-ming, LI Hai-bo, LIU Bo. Study of mechanical characteristics of simulated rock joints with second-order asperity under cyclic shear loading[J]. 2014, 35(2). DOI：

摘要

利用人工材料浇注含二阶起伏体的模拟岩石节理试样，进行常法向荷载循环剪切试验，研究节理剪切力学特性在循环剪切过程中的劣化规律。试验结果表明：二阶起伏体对节理循环剪切力学特性有重要影响，剪切强度、剪切刚度、剪胀角随剪切循环次数增大而衰减，衰减趋势随着二阶起伏度的增大而加快；法向应力、二阶起伏度较大时，二阶起伏体对剪切力学特性的影响主要体现在第1轮剪切循环中，在随后的剪切循环中影响不明显；法向应力、二阶起伏度较小时，二阶起伏体的影响在前几轮循环剪切过程中均有较清晰的体现。基于Hertz接触力学理论，提出了节理面微凸体球面接触细观模型，揭示了节理循环剪切宏观试验现象的力学机制

Abstract

Simulated rock joint samples with second-order asperity are made of artificial material. A series of constant normal load (CNL) cyclic shear tests are carried out to study the deterioration law of shear mechanical characteristics during process of cyclic shearing. Based on the experimental results，it can be found that the second-order asperity has an important influence on the shear mechanical properties of joint samples under cyclic shear loading. The shear strength

shear stiffness and dilatancy angle decrease with an increase of shear cycles

and decay more quickly with an increase of second-order asperity height. The influence of second-order asperity on the shear mechanical properties is mainly reflected in the first shear cycle with higher height of second-order asperity under higher level of normal stress

and it has no obvious effect on subsequent shear cycles. On the other hand

the influence is reflected more clearly during the begging of the shear cycles to the joints with smaller height of second-order asperity under lower level of normal stress. Finally

based on the theory of Hertz contact mechanics

a spherical contact microscopic model of asperity on the joint surface is proposed; and the mechanisms of macroscopic phenomenon during cyclic shear tests are revealed by the model.

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