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本文研究了有限长度的垂直走滑断层的滑动弱化不稳定性。我们假定断层强度在其深度方向是均匀的,但在走滑方向是不均匀的,即存在一个低强度段。使用有限元素法研究了理论位移场、应力场和应变场随远场位移的演变情况。此时,断层位移和磨擦应力并不是预先给定而是在求解过程中同时确定的。通过计算结果的分析,我们比较了理论位移场、应变场以及断层上的磨擦应力分布在稳定和不稳定滑动情况的差别,并且研究了峰值应力非均匀空间分布的影响。
This paper studies the sliding weakening instability of a finite length of vertical strike-slip fault. We assume that the fault strength is uniform in the depth direction, but not uniform in the strike-slip direction, ie there is a low-intensity segment. The finite element method is used to study the evolution of theoretical displacement field, stress field and strain field with far-field displacement. At this point, the fault displacement and friction stress are not specified but are determined simultaneously in the solution. Through the analysis of the calculation results, we compare the theoretical displacement field, strain field and the frictional stress distribution on the fault between the stable and unstable slip cases, and study the influence of the non-uniform spatial distribution of the peak stress.