三轴压缩条件下饱水岩石破坏后区荷载
速率效应试验研究

doi:10.16285/j.rsm.2018.0941

岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 72-82.doi: 10.16285/j.rsm.2018.0941

三轴压缩条件下饱水岩石破坏后区荷载速率效应试验研究

彭守建^{1, 2}，王哲^{1, 2}，许江^{1, 2}，大久保诚介¹，汤杨^{1, 2}，陈灿灿^{1, 2}，马天宇^{1, 2}

1. 重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400044； 2. 重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室，重庆 400044

收稿日期:2018-05-18 出版日期:2018-12-21 发布日期:2019-01-03
作者简介:彭守建，男，1983年生，博士，副教授，主要从事矿山岩石力学、煤与瓦斯突出灾害动力学与控制等方面的研究工作。
基金资助:
国家自然科学基金项目（No.51474040）；重庆市基础与前沿研究计划项目（No.cstc2016jcyjA0117）；中央高校基本科研业务费（No.106112017CDJQJ248825）

Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression

PENG Shou-jian^{1, 2}, WANG Zhe^{1, 2}, XU Jiang^{1, 2}, OKUBO Seisuke^{1, 2}, TANG Yang^{1, 2}, CHEN Can-can^{1, 2}, MA Tian-yu^{1, 2}

1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China

Received:2018-05-18 Online:2018-12-21 Published:2019-01-03
Supported by:
This work was supported by the National Science Foundation of China(51474040), the Basic and Frontier Research Projects of Chongqing(cstc2016jcyjA0117), and the Fundamental Research Funds for the Central Universities(106112017CDJQJ248825).

摘要/Abstract

摘要： 采用三轴压缩交替荷载速率试验，对3种饱水岩石破坏后区荷载速率效应进行研究，探讨围压对破坏后区荷载速率效应的影响规律。研究结果表明，（1）岩石在峰值处的荷载速率效应系数n值随围压的升高而逐渐增大，表明岩石在峰值处的荷载速率效应随围压的升高逐渐减弱；（2）岩石在破坏后区也呈现明显的荷载速率效应，且随着围压的升高，田下凝灰岩和荻野凝灰岩在破坏后区的荷载速率效应变得越来越明显，而井口砂岩在破坏后区的荷载速率效应则逐渐减弱；（3）运用4种荷载速率效应系数对破坏后区应力-应变曲线进行修正，其与高荷载速率对应的破坏后区应力-应变曲线重合性均较好，表明4种荷载速率效应系数均能用于量化分析岩石破坏后区荷载速率效应，但基于岩石卸载模量求取的nd最适合用于对岩石破坏后区荷载速率效应进行量化分析。

关键词: 三轴压缩, 交替荷载速率, 破坏后区, 荷载速率效应

Abstract: The loading rate effect in post-failure region of three kinds of water-saturated rocks is investigate by triaxial compression alternating loading rate test. The influence of confining pressure on the loading rate effect in post-failure region is discussed with alternating loading rate method under triaxial compression. The results show that: (1) The loading rate effect coefficient n at peaks of rocks is increased with the growth of the confining pressure. It is indicated that the loading rate effect at peak of rocks weakens with the growth of the confining pressure. (2) Rocks show obvious loading rate effect in the post-failure region. Then the loading rate effect of tage tuff and region tuff become more obvious and the loading rate effect of sandstone is weakened with growth of the confining pressure. (3) Using four kinds of loading rate effect coefficients in the post-failure region to correct the stress-strain curves in the post-failure region, the results show that the good coincidence of the stress-strain curves at a high load rate and the stress-strain curves at a low load rate in the post-failure region. It is indicated that four kinds of loading rate effect coefficients can use quantifying the loading rate effect in the post-/failure region of rocks. The nd of loading rate effect coefficients in the post-failure region is the most applicable to quantifying the loading rate effect in the post-failure region of rocks.

Key words: triaxial compression, alternating loading rate, post-failure region, loading rate effect

中图分类号:

TU 452

彭守建, 王哲, 许江, 大久保诚介, 汤杨, . 三轴压缩条件下饱水岩石破坏后区荷载速率效应试验研究[J]. 岩土力学, 2018, 39(S2): 72-82.

PENG Shou-jian, WANG Zhe, XU Jiang, OKUBO Seisuke, TANG Yang, . Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression[J]. Rock and Soil Mechanics, 2018, 39(S2): 72-82.

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三轴压缩条件下饱水岩石破坏后区荷载速率效应试验研究

Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression

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Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression

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三轴压缩条件下饱水岩石破坏后区荷载速率效应试验研究