›› 2017, Vol. 38 ›› Issue (S1): 87-95.doi: 10.16285/j.rsm.2017.S1.010

• 基础理论与实验研究 • 上一篇    下一篇

基于应力集中强度比的单裂隙岩石破坏过程研究

吕小波,赵其华,韩 刚   

  1. 1. 成都理工大学 地质灾害防治与地质环境保护国家重点实验室,四川 成都610059; 2. 成都理工大学 环境与土木工程学院,四川 成都610059
  • 收稿日期:2016-07-14 出版日期:2017-06-22 发布日期:2018-06-05
  • 通讯作者: 赵其华,男,1965年生,博士,教授,博士生导师,主要从事岩土工程、地质工程方面的研究工作。E-mail: zhqh@163.com E-mail: Lv_xb90 @163.com
  • 作者简介:吕小波,男,1990年生,硕士研究生,主要从事岩土工程方面的研究工作。
  • 基金资助:

    国家重点基础研究发展计划(No. 2011CB013501);国家自然科学基金面上项目(No.41272333)

Failure process of rock with single precast crack based on ratio of concentration stress to peak stress

LÜ Xiao-bo, ZHAO Qi-hua, HAN Gang   

  1. 1. State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2016-07-14 Online:2017-06-22 Published:2018-06-05
  • Supported by:

    The National Basic Research Programme of China (973 Programme) (2011CB013501) and the National Natural Science Foundation of China(41272333).

摘要: 对含单裂隙岩石开展单轴压缩试验,采用PIV粒子成像测速系统实时采集试验过程中岩样照片,借助PIVProcess流场处理系统将照片转为位移矢量。基于有限元原理计算应力,提出以应力集中强度比k的变化规律划分裂隙岩石变形破坏过程的方法,分析裂隙岩石变形破坏各阶段应力场特征。研究结果表明,加载过程中k随着轴向应变的增加呈现增大-稳定-波动-持续增大的变化规律,根据k变化规律,获得几个重要应力阀值即闭合应力σcc、起裂应力σci、损伤应力σcd值分别为(0.13~0.17)σp、(0.48~0.59)σp和(0.80~0.92)σp(σp为峰值应力);k波动变化结束后,急剧增大,宏观裂纹在应力集中区域出现;应力集中区域与宏观裂纹分布区域具有较好的一致性。研究结果有助于提升人们对岩石应力场变化的认识,为裂隙岩石破坏过程阶段划分的研究提供一个新方法。

关键词: 应力集中强度比, 裂隙岩石, 单轴加载, PIV粒子成像测速

Abstract: The failure process of rock containing single fissure is investigated under laboratory environments. Integrated with particle imaging velocity(PIV) and strain measurements during experiments, displacement vector of samples during failure process is identified and moreover the stress on the surface of samples is calculated based on finite element(FE) method. The k-value, which is defined as the ratio of concentration stress to peak stress of samples during experiments, is proposed to identify the stages of deformation and failure process of rock containing single fissure. Then the stress field characteristics at each stage are analyzed. The results show that: at first, k-value increased and remained constant. Then k-value fluctuated and increased dramatically with the increasing of axial strain. Several important stress thresholds are acquired according to the variation regularity of k-value; the closure stress σcc , the initiation stress σci , the damage stress σcd , and the values of them are 0.13-0.17, 0.48-0.59, 0.80-0.92 times of peak stress σp respectively. The k increased dramatically after fluctuated; macroscopic cracks are observed in the region where stress concentrated. Macrocrack distribution areas are consistent with stress-concentration areas. This study will help people to understand the stress field variation of cracked rock and provide a new way to divide the deformation and failure process of cracked rock.

Key words: ratio of concentration stress to peak stress, cracked rock, uniaxial loading, PIV particle imaging velocity

中图分类号: 

  • TU 452

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[2] 裴向军,蒙明辉,袁进科,王东坡,. 干燥及饱水状态下裂隙岩石冻融特征研究[J]. , 2017, 38(7): 1999-2006.
[3] 马秀媛 ,芮洪兴 ,王 倩,. 多尺度岩石渗透特性的试验研究[J]. , 2014, 35(8): 2191-2196.
[4] 任建喜,惠兴田. 裂隙岩石单轴压缩损伤扩展细观机理CT分析初探[J]. , 2005, 26(S1): 48-52.
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