岩体抗剪强度参数现场测试新方法及工程应用

›› 2011, Vol. 32 ›› Issue (S1): 779-0786.

岩体抗剪强度参数现场测试新方法及工程应用

王玉杰¹，赵宇飞¹，曾祥喜²，徐佳成¹，刘立鹏³

1. 中国水利水电科学研究院岩土工程研究所，北京100048； 2. 中国水电顾问集团中南勘测设计研究院地质工程处，长沙 410014；3. 中国地质大学工程技术学院，北京 100083

收稿日期:2010-12-15 出版日期:2011-05-15 发布日期:2011-05-16
作者简介:王玉杰，男，1974年生，博士，教授级高工，主要从事边坡稳定分析和岩体工程风险等方面的研究和咨询工作
基金资助:
“十一五”国家科技支撑计划项目资助（No. 2008BAB29B03-1-2）；中国水科院科研专项资助（No. 岩集1006、0932）

An in-situ method for determining shear strength parameters of rock masses and its applications

WANG Yu-jie¹, ZHAO Yu-fei¹, ZENG Xiang-xi², XU Jia-cheng¹, LIU Li-peng³

1. Department of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 2. Department of Engineering Geology, Mid-South Design and Research Institute, China Hydropower Engineering Consulting Group Co., Changsha 410014, China; 3. Faculty of Engineering Technology, China University of Geosciences, Beijing 100083, China

Received:2010-12-15 Online:2011-05-15 Published:2011-05-16

摘要/Abstract

摘要： 岩体抗剪强度参数的确定是进行岩体工程稳定性分析中最基本和最重要的，也是最困难的一项工作。由于室内和现场试验方法的局限性以及经验准则的人为性，快速、简易和较可靠确定岩体抗剪强度参数的原位测试手段一直是岩石工程界关注的热点。采用引进美国生产的岩石钻孔剪切仪，在实验室混凝土空心圆柱体和向家坝水电站坝基岩体中进行了尝试，取得了有益的试验成果。将主要从钻孔剪切仪的工作原理、数值模拟分析和工程应用等几方面对其进行全面的阐述和总结。试验成果和数值分析结果显示，岩石钻孔剪切仪是一种适用于软岩~中硬岩的原位试验设备，其试验成果总体钻孔剪切试验得到的c、小于传统三轴和直剪试验成果，但钻孔剪切试验的值在 <40?的范围内略低于传统三轴和直剪试验成，而钻孔剪切试验的c值较传统三轴和直剪试验的c 值降低较多，一般为25%～50%。

关键词: 钻孔剪切试验, 剪切强度, 节理岩体, 原位测试

Abstract: The shear strength parameters of rock masses are generally most important and difficult to determine when performing stability analysis of rock works. Due to a large number of limitations existed in laboratory and in-situ experiments and uncertainties of empirical methods display, there has been a strong need to develop a new in-situ testing apparatus that can measure the shear strength parameters of rock masses in a quick and reliable way. Since a Rock Bore Shear Tester (RBST) made by Handy Geo. Instruments, Inc. was introduced by IWHR, a large number of laboratory and in-situ RBST experiments have been performed. The shearing mechanism, numerical simulation of RBST shearing process and its applications to Xiangjiaba dam site are presented. It can be found from the numerical analysis and in-situ testing results that RBST is applicable to soft and intermediate hard rock masses. The cohesion and friction angle determined by RBST are generally less than those determined by tri-axial and direct shear tests. In addition, the interal friction angle determined by RBST is a little less than that determined by triaxial and direct shear tests when <40?; and the cohesion c is considerably less than that determined by triaxial and direct shear tests by 25%-50%.

Key words: rock borehole shear test, shear strength, jointed rock mass, in-situ testing

中图分类号:

TU 443

王玉杰，赵宇飞，曾祥喜，徐佳成，刘立鹏. 岩体抗剪强度参数现场测试新方法及工程应用[J]. , 2011, 32(S1): 779-0786.

WANG Yu-jie , ZHAO Yu-fei , ZENG Xiang-xi , XU Jia-cheng , LIU Li-peng. An in-situ method for determining shear strength parameters of rock masses and its applications[J]. , 2011, 32(S1): 779-0786.

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