“弹性回跳”前的微破裂活动与变形序列

本以两承压岩体相互作用系统作为“弹性回跳”地震模型，用损伤力学的方法研究了系统失稳即地震前位移速率、声发射等前兆规律与岩石破裂过程的关系，用差分法在计算机上求得了地震发生过程中的变形与地声序列曲线，研究发现在某些情况下出现地声相对平静是由于两岩体介质中某一介质体破裂而另一个介质体弹性恢复所致。

ACTIVITY OF MICRO FRACTURE AND DEFORMATION SEQUENCE BEFORE ELASTIC REBOUND

Taking the system, in which two bearing rock bodies activate mutually, as the earthquake model of elastic rebound, the relation between the precursory pattern, such as displacement rate and acoustic emission, and failure process of rock in the system unbalance, namely before earthquake, has been studied by the method of injury mechanics. The curves of deformation and geosound sequence during the process of earthquake occurrence were obtained in computer by differential method. It is discovered from the study that at some conditions, the relative quiescence of geosound is because one of the two rock bodies failed and another showed elastic recovery.