›› 2017, Vol. 38 ›› Issue (S2): 57-66.doi: 10.16285/j.rsm.2017.S2.008

• 基础理论与实验研究 • 上一篇    下一篇

不同围压下岩石广义应力松弛特性试验研究

许 江,马天宇,大久保诚介,彭守建,汤 杨,陈灿灿,王 哲   

  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
  • 收稿日期:2007-09-15 出版日期:2017-11-23 发布日期:2018-06-05
  • 作者简介:许江,男,1960年生,博士,教授,博士生导师,主要从事岩石力学与工程方面的教学与研究工作。
  • 基金资助:

    国家自然科学基金面上项目(No. 51474040)。

Experimental study of generalized stress relaxation characteristics of rock under different confining pressures

XU Jiang, MA Tian-yu, OKUBO Seisuke, PENG Shou-jian, TANG Yang, CHEN Can-can, WANG Zhe   

  1. State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
  • Received:2007-09-15 Online:2017-11-23 Published:2018-06-05
  • Supported by:

    This work was supported by the General Project of the National Natural Science Foundation of China(51474040).

摘要: 实际工程中有些岩体发生的流变性既不是纯蠕变又不是纯应力松弛,表现为应力和应变同时发生变化。利用可视化三轴压缩伺服控制试验系统,研究了不同围压条件下岩石的广义应力松弛特性,试验结果表明,岩石存在应变及应力同时增大、应变增大而应力减小、应变及应力都减小的情况,岩石蠕变和应力松弛行为属于岩石广义应力松弛现象的特例;在不同情况下的广义应力松弛过程中围压对岩石广义应力松弛特性的影响不甚相同,岩石轴向应变增大时围压越高岩石试件轴向变形越困难,岩石应变减小时围压越高岩石试件变形越明显。采用广义应力松弛试验方法,开展单轴及三轴压缩荷载作用下岩石广义应力松弛试验研究,对不同情况下岩石广义应力松弛特性的围压效应进行对比分析,以期对后期开展更深入的三轴广义应力松弛试验研究具有一定的指导和借鉴意义。

关键词: 田下凝灰岩, 广义应力松弛, 三轴试验, 围压效应

Abstract: In practice, rock mass is neither subjected to pure creep of pure relaxation but to a stress-strain synchronously varies with the lapse of time. Using the visual triaxial compression servo-control test system, the generalized stress relaxation tests are carried out under different confining pressures in different regions including creep and relaxation. The experimental results show that there is different conditions of strain and stress in rock mass, which include strain and stress increase at the same time, strain increase but stress decrease, strain and stress decrease at the same time; creep and relaxation are special cases of generalized stress relaxation of rock. Confining pressure effects of rock mass depend on the condition of generalized stress relaxation; confining pressure curbs the deformation in the condition of axial deformation increasing; and confining pressure promotes the deformation in the condition of axial deformation decreasing. In this paper, the study of generalized relaxation test under triaxial stress is carried out using the generalized stress relaxation test. And the generalized stress relaxation characteristics of the rock under confining pressure are compared and analyzed, so as to provide some guiding and reference significance for the further study of triaxial generalized stress relaxation test.

Key words: tage tuff, generalized stress relaxation, triaxial test, confining pressure effect

中图分类号: 

  • TU452

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