岩体地震动力破坏问题研究

DISCUSSION ON ROCKMASS FAILURE UNDER SEISMIC LOAD

研究岩体在地震动力作用下的破坏机制需要结合岩石力学、工程地质、地震工程、地震学等诸多学科。本文首先简要评论了岩石动力学的研究现状,然后对两种主要的动荷载——爆破和地震进行对比,通过对地震波产生的动应力和岩体强度特性的比较,认为岩体在地震动力作用下主要是拉张破坏和结构面破坏,并提出了岩体地震动力破坏的极限深度,最后讨论了地应力和地形对岩体地震动力破坏的重要影响。

The failure of rockmass under seismic load is an intercrossing problem of multi-discipline,such as rock mechanics,engineering geology,earthquake engineering and seismology. In this paper,the two important dynamic loads,rock blasting and earthquake,are discussed firstly,and then the dynamic stress induced by seismic wave propagation and the strength characteristics of rock mass are compared. It is concluded that the main cause of rock mass failure under seismic load is tensile fracture of rock material and failure of discontinuities. The limit depth of rockmass failure under seismic load is put forward,and the important influences of in-situ stress and topography on types and extent of rockmass failure under seismic load are analysed.