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本文从弹塑性岩石介质的一般的本构方程出发,考虑断层介质内摩擦系数和内聚力随变形而降低的性质,建立了断层介质的非稳定的本构关系。这些关系可应用于承受任何应力的不同走向和倾角的断层。考虑到复杂的现代构造和非均匀应力场的背景,给出一个用能量表述的非稳定准则,用它来判断包含断层和围岩在内的整个系统的非稳定性的到来。最后按本文提出的模型用有限元方法对两个震例做了初步的分析。
In this paper, based on the general constitutive equations of elastic-plastic rock media, the instability constitutive relation of the fault medium is established considering the nature of friction coefficient and cohesion decreasing with deformation in the fault medium. These relationships can be applied to faults of different directions and inclinations under any stress. Considering the complex background of modern structure and inhomogeneous stress field, an energy-based unsteady criterion is given, which can be used to judge the instability of the whole system including fault and surrounding rock. Finally, according to the model proposed in this paper, a finite element method is used to analyze the two earthquake cases.