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岩石具有两种不同机制的突发失稳型式,即低压和高压突发失稳。二者的基本区别在于错动过程的“非匀阻”和“匀阻”。错动面的凹凸不平是造成非匀阻和影响失稳型式的重要因素之一。根据不同的机制和运动方程,建立了各种失稳型式的相应判据,其中反映了环境刚度、接触刚度及非匀阻系数的影响。浅源强震主要是一种高压突发失稳的过程。本文强调,除强度条件外,强震的发生还必须具备环境刚度条件、匀阻条件以及其它的必要条件。
The rock has two types of sudden failure modes with different mechanisms, namely the sudden failure of low pressure and high pressure. The basic difference between the two lies in the “non-uniform resistance” and “uniform resistance” of the dislocation process. Uneven surface of the bump is caused by non-uniform and affect the type of instability, one of the important factors. According to different mechanisms and equations of motion, corresponding criteria for various types of instability are established, which reflect the influence of environmental stiffness, contact stiffness and non-uniform coefficient. The shallow source strong earthquake is mainly a kind of high pressure sudden instability process. This paper emphasizes that, in addition to the strength conditions, the occurrence of strong earthquakes must also have environmental stiffness conditions, uniform resistance conditions and other necessary conditions.