摘要
根据渭河盆地的地应力测量资料,结合震源机制解,采用有限单元法反演了渭河盆地区域构造应力与形变场。讨论了区域内应力场和应变能密度分布的基本特征及其与历史地震活动的关系。在此基础上,采用西源流变模型对应力-形变场随时间的变化作了粘弹塑性有限元模拟。
In this paper a FEM (finite element method) numerical simulation of the regional stress-deformation field of Weihe Fault basin is presented. According to some in-situ geostress measurements and fault plane solutions of focal mechanism in the basin, a back-deduction FEM analysis of regional stress-deformation field is carried out firstly in this paper. On the basis of the basic characteristics analysis of the regional stress field and strain energy density distribution and their relationship with historic earthquakes are discussed. Finally, the variation of regional stress-deformation field with time is simulated numerically with FEM based on elasto-plastic-viscosity rheological model.
关键词
断陷盆地
应力
形变场
有限元
地壳
Weihe Fault Basin, stress-deformation field, finite element method(FEM), evaluation of crust stability, ground fissures
