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发表时间：2022-10-04

发表刊物：岩土工程学报

所属单位：建设工程学部

卷号：35

期号：6

页面范围：1147-1155

ISSN号：1000-4548

摘要：Based on the microscopic damage mechanics and the dynamic finite element
   method, the fragmentation process of jointed rock mass under dynamic
   loading is simulated. In the dynamic analysis model, the viscous
   boundary is considered to eliminate the influence of the reflected
   stress waves from the boundary. The numerical results show the joints
   change the stress wave propagation mode in the rock masses. On one side,
   the reflected tensile stress on the surface of the joints enhances the
   fracturing of the rock between the joint and the drill bit. On the other
   side, the fracturing toward the specimen bottom is restrained due to the
   fact that the dynamic wave propagation is absorbed by the weak joints.
   The fragmentation is also influenced by the joint spacing. The rock
   specimens are more obviously fractured with smaller joint spacing. The
   inclination of the joints leads to non-symmetric fragmentation at the
   two sides of the bit and affects the ability of the downward extension
   of the main crack. The simulation will be helpful for understanding the
   mechanism of dynamic failure of jointed rock mass and underground
   engineering.

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