应力波对滑移弱化断层的动态触发作用  

Dynamic triggering of stress wave to fault with linear slip-weakening friction

作　　者：刘艳[1] 许金余[1,2] 

机构地区：[1]西北工业大学力学与建筑工程学院,陕西西安710072 [2]空军工程大学工程学院,陕西西安710038

出　　处：《爆炸与冲击》2009年第1期18-22,共5页Explosion and Shock Waves

摘　　要：将断层简化为满足线性滑移弱化摩擦准则的理想裂纹界面。在考虑初始应力的条件下,研究了应力波通过两个相互接触的弹性半空间时的透射和反射关系。在此基础上,得出了应力波扰动断层时的初始滑移条件和不稳定滑移条件,并分析了断层动态触发与扰动应力波、断层特性和初始状态等因素的关系。当入射角一定时,入射波频率越高,所需振幅越大;断层的临界滑移越大,断层越稳定,扰动应力波所需振幅越大。The paper characterizes the fault zone as an idealized interface with linear slip-weakening friction and investigates reflection and transmission of stress wave across two elastic half-spaces on the condition that the initial stress state of rock interface is taken into account. On this basis, the conditions of initial slip and unstable slip are revealed, and the occurrence of dynamic triggering is analyzed which depends on the balance between the incident wave and intrinsic mechanics of fault. The example shows that when the angle of incidence is given, the higher the frequency is, the larger the needed amplitude is.

关 键 词：固体力学 动态触发 滑移弱化摩擦 断层 应力波 

分 类 号：O347[理学—固体力学]