关键词: 非均质节理岩体, 冲击破坏, 水平节理, 垂直节理, 数值流形方法

Abstract:

The existence of the joints is an important characteristic of rock mass distinctly different from rock, and it is also an important factor leading to the heterogeneity and anisotropy of rock mass. The failure characteristic of jointed rock mass under blast impact load is not only a hot subject in study of rock mass mechanics, but also an engineering problem in rock blasting, while such models as those created by finite element method and discrete element method cannot objectively reflect the actual distribution law of joints in rock mass. However, the new kind of numerical method——numerical manifold method can create the calculation model completely according to the actual distribution law of the joints in rock mass, and can perfectly simulate the occurrence of the new cracks and opening of the existed joints in the rock mass under the action of external load. By corresponding program of numerical manifold method, the failure process of the rock mass with such three kinds of joints as horizontal joints, vertical joints and no joints under the impact load perpendicular to the circumference is simulated. From the simulation result, it can be evidently seen that the existence of the joints plays a vital role on failure form of rock mass. The failure form of the intact rock mass has good symmetry, while to horizontal jointed and vertical jointed rock mass, their failure forms are controlled by the distribution of the joints to large extent. The study result is of certain meaning in rock blasting engineering design.

Key words: heterogeneous jointed rock mass, impact failure, horizontal joint, vertical joint, numerical manifold method