Anisotropic Strength Characteristics of Jointed Rock Mass
The strength of jointed rock masses is usually anisotropic and depends on the behavior of discontinuities and intact rocks. In the present study, Particle Flow Code in 3 Dimensions (PFC3D) is used to simulate the compression tests of jointed rock so as to find out the anisotropic strength characteristics of jointed rock masses. The numerical models having a single joint or one and two sets of joints are used. And the testing conditions include the uniaxial and triaxial compression accompanying the different joint persistence. Many valuable conclusions obtained are as follows. Duo to presence of joints, the strength of the jointed rock is reduced. The strength of the jointed rock is dependent on the inclination and persistence as well as number of the joints. The degree of strength anisotropy of the jointed rock is the highest at uniaxial compression condition. The degree of strength anisotropy decreases with increasing confining pressure and persistence of the joints. The superimposition principle is not suitable to estimate the strength of rock containing several sets of joints because interaction between joints is not considered. The unaxial strength of rock having one set of joint is related to the inclination and number of the joints. As the number of joints increases, the rock strength gradually decrease and close to a constant.
Chun-sheng Qiao Zhi-gang Zhang Xiao Li
Beijing Jiaotong University, Beijing China Highway Planning and Design Institute Consultants. Inc., Beijing Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing
国际会议
香港
英文
1-6
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）