论文部分内容阅读
岩体节理面的刚度系数、黏结力和内摩擦角是反映节理面力学特性的重要参数。基于含不同倾角节理岩样的三轴压缩试验,通过对标准岩样的应力-位移分析,由互等功原理,建立节理岩样应变与位移新的几何关系,推导出弹性状态下节理刚度系数解析解,根据摩尔-库仑强度理论得出节理面的黏结力和内摩擦角。为了检验方法的正确性,对含节理面的同类岩体进行直接剪切试验,测出节理面的法向刚度、切向刚度、黏结力和内摩擦角。结果表明,两种方法所得结果基本吻合,说明所提出的方法可以通过节理岩样三轴压缩试验及理论分析间接得到岩体节理面的刚度系数、黏结力和内摩擦角,实现了节理岩体力学参数的简捷、快速测定。
The stiffness coefficient, cohesion and internal friction angle of rock joint surface are important parameters that reflect the mechanical properties of joint surface. Based on the triaxial compression tests of rock samples with different dip angles, the new geometrical relationship between the strain and displacement of the jointed rock samples was established by stress-displacement analysis of the standard rock samples by the principle of reciprocal work, and the joint stiffness coefficient Analytical solution, according to the Mohr Coulomb strength theory to obtain the joint surface of the cohesion and internal friction angle. In order to test the correctness of the method, the direct shear tests on the rock mass containing the jointed surface were carried out to measure the normal stiffness, tangential stiffness, cohesive force and internal friction angle of the jointed surface. The results show that the results obtained by the two methods are in good agreement with each other, indicating that the proposed method can obtain the stiffness coefficient, cohesion and internal friction angle of jointed joints indirectly through the triaxial compression tests and theoretical analysis of jointed rock specimens, Simple and fast determination of mechanical parameters.