院报 ›› 2019, Vol. 36 ›› Issue (7): 96-99.DOI: 10.11988/ckyyb.20171284

• 岩土工程 • 上一篇    下一篇

岩石结构面抗剪强度MTS三轴试验方法研究

荀晓慧1, 魏玉峰1, 符文熹2, 张斌3   

  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,成都 610059;
    2.四川大学 水力学及山区河流保护国家重点实验室,成都 610065;
    3.中国华西工程设计建设有限公司,成都 610031
  • 收稿日期:2017-11-07 出版日期:2019-07-01 发布日期:2019-07-18
  • 通讯作者: 魏玉峰(1979-),男,内蒙古赤峰人,副教授,博士,主要从事地质工程、岩土工程的教学与科研工作。E-mail:weiyufeng@cdut.edu.cn
  • 作者简介:荀晓慧(1980-),女,山西交城人,编辑,硕士,主要从事地质灾害防治工作。E-mail:xunxh@cdut.edu.cn
  • 基金资助:
    国家重点研发计划项目(2017YFC1501000);四川省教育厅资助科研项目(18ZA0045);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2016Z016)

A Method of Determining Shear Strength of Rock Discontinuities Through Triaxial Test

XUN Xiao-hui1, WEI Yu-feng1, FU Wen-xi2, ZHANG Bin3   

  1. 1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University ofTechnology, Chengdu 610059, China;
    2.State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University, Chengdu 610065, China;
    3.China Huaxi Engineering Design &Construction Co., Ltd.,Chengdu 610031, China
  • Received:2017-11-07 Online:2019-07-01 Published:2019-07-18

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摘要： 尝试在电液伺服岩石试验系统(MTS)上对无充填岩石节理试件进行三轴试验,该试验方法可利用一个结构面试样获得多组抗剪强度数据,克服了结构面直剪试验取样困难、试验结果离散性大等缺点,方法更为简单、快速。在此基础上,除对每一试件的试验结果按线性Mohr-Coulomb准则获得摩擦角和内聚力外,还对比分析了线性Mohr-Coulomb准则拟合、幂函数拟合和非线性Barton公式拟合结果,并对提出的试验方法进行了可靠性验证,最后分析了试验方法的适用范围。幂函数拟合和Barton公式拟合能够反映岩石节理剪切强度的非线性特征,优于Mohr-Coulomb准则;当0.01<σnj/JCS<0.3时,幂函数拟合和Barton公式拟合岩石结构面剪切强度比较可靠,而当σnj/JCS>0.3时获得的剪切强度偏高。

关键词: 无充填岩石, 结构面, 抗剪强度, 三轴试验, 取值方法

Abstract: A simple and rapid method of triaxial test on non-filled rock specimens containing irregular discontinuities by using rock mechanics test system (MTS) is presented in this paper. Multiple shear strength data can be obtained by using this method in the presence of only one single specimen. The difficulty of preparing test specimen is overcome and the highly discrete test results can be avoided. In addition, approaches to determine the parameters of linear Mohr-Coulomb criterion fitting, power function fitting and nonlinear Barton equation fitting according to test results are examined and the results of different approaches are compared to verify the rationality of the method. The application scope of the test method is also put forward. Results suggest that power function fitting and nonlinear Barton equation fitting are superior to Mohr-Coulomb criterion in reflecting the nonlinearity of shear strength of jointed rock. When 0.01<σnj/JCS<0.3, the result of shear strength of jointed rock obtained by the two fitting methods are reliable; when σnj/JCS>0.3, the result is larger.

Key words: non-filled rock, discontinuity, shear strength, triaxial test, determining method

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