山西地堑系现今构造应力场的三维数值模拟  

Numerical Modeling of Present Tectonic Stress Field of Shanxi Graben System

作　　者：李清武[1] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《内蒙古石油化工》2015年第7期18-21,共4页Inner Mongolia Petrochemical Industry

摘　　要：利用ANSYS数值模拟软件运用有限法模拟了山西地堑系现今构造应力场的分布特征。模型的构建主要基于山西地堑系精细的三维地震数据体及接近真实的地质情况。根据模拟结果,定量的分析了山西地堑系第一主应力、第三主应力及应力强度的分布特征,得出以下认识:1山西地堑系内盆地主要受张应力控制,盆地边缘地壳应力值较大,尤以大同盆地和太原盆地比较突出;2地堑系内NE向断裂主要受压应力控制,而NW向断裂主要受张应力控制;3在大同盆地中南侧的六陵山山前断裂受到挤压应力值非常大,岩石易发生挤压破碎发生地震,应该重点观测。The present--day stress field of the Shanxi graben is anlysized using finite element modeling （FEM） by ANSYS numerical simulation software. The models are constructed based on 3D seismic data and the actual geologic situation. According to the simulation results, we quantitatively explain the distribution characteristics of the first /third principal stresses and stress intensity. The results are as followed ： The Shanxi graben system basins are controlled by the tension stress, and the crust stress of basin edge is larger, especially in the Datong Basin and Taiyuan Basin. The NE faults in Shanxi graben are mainly affected by the extrusion stress and NW fault are mainly affected by the tensile stress. LiuLing Mountain piedmont fault located in the south of Datong Basin compression stress value is very big, The rock crushing occur and cause earthquakes easily, the area Should focus on monitoring. The action of tensile stress.

关 键 词：山西地堑 构造应力场 数值模拟 

分 类 号：P315.8[天文地球—地震学]