复合构造对地应力分布特征的影响  

Influence of Composite Structure on the Distribution Characteristics of Geostress

作　　者：任惠亮 段东[1] 陈思顺 REN Huiliang;DUAN Dong;CHEN Sishun(School of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院

出　　处：《矿业研究与开发》2019年第6期58-62,共5页Mining Research and Development

基　　金：国家自然科学基金资助项目(51604184)

摘　　要：构造应力场是地应力场的重要组成部分,节理、断层、褶曲以及一定范围内各类地质构造的共存与组合对地应力场的分布有着显著的影响。在宁夏某矿地质构造勘查以及实测地应力数据的基础上,利用有限元数值模拟软件MIDAS GTS NX对断层与褶曲的复合构造进行了三维数值模拟,分析了断层与褶曲的复合构造对地应力分布规律与特征的影响。结论表明:断层端部两侧会形成包括最大主应力、最小主应力、水平应力及垂直应力的应力集中区和降低区,且集中区或降低区在两个端部的位置关于断层截面几何中心呈中心对称;最大主应力在断层处的方向几乎垂直于断层面,在断层端部一侧应力集中区的方向接近平行断层倾向,另一侧应力降低区则接近垂直断层面;模型整体在断层附近形成了以断层为中心的水平应力集中区,背斜轴部不再形成明显的应力集中;模型整体垂直应力随深度而增大,但断层东侧地层垂直应力随深度增大的更快,整体数值也较断层西侧地层更大。The tectonic stress field is an important part of the geostress field.The coexistence and combination of joints,faults,folds and various geological structures within a certain range have a significant impact on the distribution of the geostress field.Based on the geological structure exploration and measured geostress data of a mine in Ningxia,the finite element numerical simulation software MIDAS GTS NX was used to simulate the combined structure of fault and fold,and the influence of fault and fold composite structure on geostress distribution and characteristics was analyzed.The results were concluded as follows.Firstly,the stress concentration zone and the reduction zone including the maximum principal stress,the minimum principal stress,the horizontal stress and the vertical stress were formed on both sides of the fault end,and the concentrated zone or the reduced zone in the position of the two ends was symmetrical about fault section in center of the geometric center.Secondly,the direction of the maximum principal stress at the fault was almost perpendicular to the fault section.The direction of the stress concentration zone on the side of the fault was close to the parallel fault tendency,and the stress reduction zone on the other side was close to the vertical fault section.Thirdly,the whole model formed a horizontal stress concentration zone centering on the fault nearby,and the stress concentration was no longer obvious on the axis of the anticline.Finally,the whole vertical stress of the model increased with depth,but the vertical stress of the stratum on east side of the fault increased faster,and the overall value was larger than that on the west side of the fault.

关 键 词：断层 褶曲 复合构造 三维数值模拟 地应力 

分 类 号：TD311[矿业工程—矿井建设]