节理岩体抗剪强度参数的实验分析

对红层软岩的大量实验表明，剪切与三轴压缩实验测得的抗剪强度参数值不一致，而且内摩擦角从完整岩石剪切实验、三轴压缩实验到结构面剪切实验呈现出由大到小的规律．基于上述实验结果，分别从岩石强度理论和实验方法的角度分析了3种实验所得参数不一致的原因，导出了三轴压缩实验得到的岩体抗剪强度参数与结构面抗剪强度参数之间的关系式，并提出了岩体抗剪强度参数的选取原则．

Experimental Investigation on Shear Strength Parameters of Jointed Rock Mass

Laboratory tests were performed on red bed soft rocks. The results show that shear strength parameters from a shear test and a triaxial compressive test are not consistent, and that friction angle changes with a regularity of continuous decreasing from the shear of intact rock to the triaxial compression of rock mass to the shear of structural planes. From the above experimental results, reasons for the difference between the three tests were analyzed respectively based on the strength theory of rock and the methods of laboratory tests. Relationships between the shear strength parameters of rock mass from a triaxial test and the shear strength parameters of structural planes were set up. In addition, the principles of determining the shear strength parameters of rock mass were put forward.