岩石抗剪强度参数的围压效应与定量表征  

Confining pressure effect and quantitative characterization of rock shear strength parameters

作　　者：李斌[1] 李佳伦 王鹏 何治良[1] 胡康强 胡芸菡 LI Bin;LI Jialun;WANG Peng;HE Zhiliang;HU Kangqiang;HU Yunhan(School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;Northwest Sichuan Geological Team of Sichuan Bureau of Geology and Mineral Resources,Mianyang 621010,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]四川省地质矿产勘查开发局川西北地质队,四川绵阳621010

出　　处：《中国矿业》2023年第2期157-164,共8页China Mining Magazine

基　　金：国家自然科学基金青年科学基金项目“考虑围压效应的岩石抗剪强度参数联合分布研究”资助(编号:51904248);四川省教育厅科研项目一般项目“基于非线性岩石强度准则的可靠度判别模型研究”资助(编号:18ZB0598)。

摘　　要：根据岩石三轴强度和岩石抗剪强度的非线性特征,可知岩石抗剪强度参数在围压的影响下具有不确定性,通过分析可知该参数的围压效应特征为内聚力和内摩擦角与围压分别呈正相关和负相关。本文根据包络线与莫尔圆的几何关系,结合Mohr-Coulomb准则进行推导,探讨了考虑围压效应的岩石抗剪强度参数的表征方法。以岩石三轴试验数据为基本信息,开展基于精度评价的岩石强度准则优选,建立基于非线性准则的岩石抗剪强度参数表征模型,通过比较分析表征结果与试验结果,证明了提出表征方法的合理性及该方法获取岩石抗剪强度参数的可靠性。该方法可为后续的岩石抗剪强度参数边缘分布和参数间的联合分布研究提供大样本数据库。According to the nonlinear characteristics of rock triaxial strength and rock shear strength,it is pointed out that rock shear strength parameters have uncertainty under the influence of confining pressure.Through analysis,the confining pressure effect of the parameters are characterized by positive correlation between cohesion and confining pressure,while internal friction angle and confining pressure are negatively correlated.Based on the geometric relationship between the envelope and the Mohr circle,combined with Mohr-Coulomb criterion,it is deduced to discuss the characterization method of rock shear strength parameters considering the effect of confining pressure.Using rock triaxial test data as basic information,the optimization of rock strength criteria is carried out,and a rock shear strength parameter characterization model based on nonlinear criterion is established.By comparing and analyzing the characterization results and the test results,the rationality of the proposed method and the reliability of the method to obtain rock shear strength parameters are proved.The characterization method can provide a large sample database for subsequent research on the edge distribution and the joint distribution of rock shear strength parameters.

关 键 词：岩石抗剪强度 三轴强度 围压效应 岩石强度准则 

分 类 号：TU459.2[建筑科学—岩土工程]