法向卸荷下贯通裂隙岩样压剪破坏特征研究

doi:10.16285/j.rsm.2018.2350

岩土力学 ›› 2019, Vol. 40 ›› Issue (S1): 217-223.doi: 10.16285/j.rsm.2018.2350

法向卸荷下贯通裂隙岩样压剪破坏特征研究

翟明磊¹，郭保华^{1, 2}，王辰霖¹，焦峰³

1. 河南理工大学能源科学与工程学院，河南焦作454000；2. 煤炭安全生产河南省协同创新中心，河南焦作454000； 3. 重庆大学资源及环境科学学院，重庆 400044

收稿日期:2018-12-27 出版日期:2019-08-01 发布日期:2019-08-16
通讯作者: 郭保华，男，1979年生，博士，副教授，主要从事岩石裂隙变形与渗流方面的研究工作。E-mail: guobaohua@139.com E-mail:minglzhpu@126.com
作者简介:翟明磊，男，1991年生，硕士研究生，主要从事岩石失稳破坏等方面的学习与研究工作
基金资助:
国家自然科学基金项目（No.51109076）

Compression-shear failure characteristics of rock with penetrated fracture under normal unloading condition

ZHAI Ming-lei¹, GUO Bao-hua^{1, 2}, WANG Chen-lin¹, JIAO Feng³

1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China; 2. Synergism Innovative Center of Coal Safety Production in Henan Province, Jiaozuo, Henan 454000 China; 3. College of Resources and Environmental Sciences, Chongqing University, Chongqing 400044, China

Received:2018-12-27 Online:2019-08-01 Published:2019-08-16
Supported by:
This work was supported by the National Nature Science Foundation of China (51109076).

摘要/Abstract

摘要： 开展贯通裂隙岩样在法向卸荷下的压剪破坏研究，有助于更好地理解岩体裂隙在卸荷条件下的失稳特征。对单裂隙贯通岩样开展剪切应力峰前一系列法向卸荷破坏试验，分析了法向卸荷下试样裂隙的变形及能量演化规律。结果表明，法向卸荷下裂隙压剪失稳时的法向应力大于常规直剪试验的对应值，裂隙的抗剪能力减弱；剪切位移随法向应力减小而增大；卸荷变形比K随裂隙轮廓面积比Rs的增加而增大；卸荷过程中总变形能U0由减小转变为增加的现象可用于预测岩石裂隙卸荷失稳。研究结果对理解贯通裂隙岩体压剪卸荷失稳破坏具有一定参考意义。

关键词: 贯通裂隙, 法向卸荷, 变形特征, 能量演化

Abstract: The instability characteristics of fractured rock masses under unloading conditions can be better understood depending on compression-shear failure experiments on fractured rock samples. In this paper, a series of normal unloading tests on rock specimen with a single fracture were conducted under pre-peak shear stress. The deformation of rock samples and energy evolution were analyzed. The results show that the normal stresses at failure under normal unloading condition are larger than those of direct shear loading test, and the shear resistance of fractures decreases. The shear displacement increases with the decrease in normal stress. The normal deformation ratios(K) under normal unloading conditions increase with the increase in the contour area ratios(Rs) of rock fracture surfaces. The total energy decreases at first, and then increases during normal unloading process. This phenomena can be used to predict the imminent unloading instability of fractured rock masses. The results in this paper have certain references for understanding the unloading instability failure of fractured rock masses.

Key words: penetrated fracture, normal unloading, deformation characteristics, energy evolution

中图分类号:

TU 452

翟明磊, 郭保华, 王辰霖, 焦峰, . 法向卸荷下贯通裂隙岩样压剪破坏特征研究[J]. 岩土力学, 2019, 40(S1): 217-223.

ZHAI Ming-lei, GUO Bao-hua, WANG Chen-lin, JIAO Feng, . Compression-shear failure characteristics of rock with penetrated fracture under normal unloading condition[J]. Rock and Soil Mechanics, 2019, 40(S1): 217-223.

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法向卸荷下贯通裂隙岩样压剪破坏特征研究

Compression-shear failure characteristics of rock with penetrated fracture under normal unloading condition

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