采用PFC^3D数值模拟方法模拟在抗拉、抗压试验下不同倾角层理面的岩体的破坏过程,从颗粒的位移和速度分布等方面出发,阐述了节理岩体的破坏机理,并与实验室条件下获得的节理岩体强度和变形特性进行比较和分析。结果表明,单轴抗压强度在0-60°范围内随倾角α的增加而减小,在60°-90°范围内随倾角的增大而增大;单轴抗拉强度在0-90°范围内随倾角α的增加而减小。数值模拟得到的数据与实验测试得到的数据较吻合,为实际工程中节理岩体力学参数的确定提供了一种新的渠道。

The failure process of rock mass with different angle beddings in compression and tensile tests was simulated by using PFC^3D numerical simulation. According to the displacement and speed distribution of the particles, the failure mechanism of rock joints is put forward, and the strength and deformation characteristics of jointed rock masses are compared with that under the laboratory conditions. The results show that the uniaxial compressive strength first decreases with the increase of angle beddings in the range of 0-60°and then increases with the increase of angle beddings in the range of 60°-90°; the tensile strength decreases with the increase of angle beddings in the range of 0-90°. The results of the PFC^3D numerical simulation are in perfect agreement with the test results, and provide a new way for the determination of the strength parameters of jointed rock masses in practical engineering.