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arXiv physics/0510159physics.geo-phphysics.comp-ph
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正断层应力和位移的有限元分析

Normal-fault stress and displacement through finite-element analysis

Antonietta Megna, Salvatore Barba, Stefano Santini

摘要:

我们用二维平面应变有限元法计算了正断层引起的位移和应力。要做到这一点,我们适用于一个系统的力的故障节点,并开发一个迭代算法,以确定任何滑移分布的力的大小。作为一个例子,我们计算力的大小,假设均匀滑动10公里的二维正断层。数值模型产生的位移和应力场,以及比较分析解决方案。事实上,我们发现位移(<5%)、位移方向(<15 °)和应力分量(<35%,其中一半是由于滑动公差)的差异很小。我们分析了这种失配,并讨论了误差如何从位移传播到应力。我们的计划提供了一个方便的方法来使用有限元直接法在一个试错过程中重现任何光滑的滑移分布。

英文摘要:

We compute displacement and stress due to a normal fault by means of two-dimensional plane-strain finite-element analysis. To do so, we apply a system of forces to the fault nodes and develop an iterative algorithm serving to determine the force magnitudes for any slip distribution. As a sample case, we compute the force magnitudes assuming uniform slip on a 10-km two-dimensional normal fault. The numerical model generates displacement and stress fields that compare well to the analytical solution. In fact, we find little difference in displacements (<5%), displacement orientation (<15 DEG), and stress components (<35%, half of which due to slip tolerance). We analyze such misfit, and discuss how the error propagates from displacement to stress. Our scheme provides a convenient way to use the finite-elements direct method in a trial-and-error procedure to reproduce any smooth slip distribution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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