文档介绍：基于 ANSYS 的活动断裂与应力场关系研究
李玉江,陈连旺
中国地震局地壳应力研究所(地壳动力学重点实验室),北京,100085
[ 摘要] 基于鲜水河断裂带较为精细的三维有限元模型,研究断裂的存在对区域应力场的影
响。研究结果表明:1)活动断裂的存在及其走向的变化,使得应力高值区主要分布
在断层的端部、断层的交汇区及断层走向显著变化的区域;2)随着断层杨氏模量的
减小,更有利于在断层附近产生较大的应变分布,从而易于形成高应力水平区。但断
层杨氏模量的变化不会造成断裂带相对应力高值区的分布;3)鲜水河断裂的相对高
值区主要集中在乾宁、炉霍和甘孜地区为高。该项工作的开展为断裂带周围的台阵布
设提参考依据。
[ 关键词] 鲜水河断裂带;最大剪应力;数值模拟
Relationship Between the Active Fault and Stress Field
Basing on the ANSYS Software
LI Yu-Jiang,CHEN Lian-Wang
Key laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing
100085,China
[ Abstract ] In this paper, we develop a three-dimensional finite element model concerning the
Xianshuihe fault zone to explore the relationship between the active fault and stress field.
The preliminary results indicate that: 1) the maximum shear stress is mainly along the fault
terminal, the fault intersections and the bend of the fault geometry, due to the fault
geometry and fault structure; 2) with the reduction of the Young’s modulus in the fault
zone, it’s conducive to generate the greater strain distribution, hence forming the high
stress level. However, the Young’s change doesn’t alter the relative stress pattern; 3) the
relative high stress region is concentrating on the Qianning, Luhuo and Garz. Briefly, the
implement of this work is meaningful for the a