新疆天山地区地应力场特征分析

随着国家经济的发展，西部地区的建设逐渐加快。探究区域地应力场的特征可以为科学研究、防震减灾以及工程建设提供参考依据。天山地区常用的测量地应力方法有水压致裂法、套芯应力解除法、震源机制解和断层滑动反演，本文对这些方法做了简述。本文通过文献搜集与整理的方法，基于中国大陆地壳应力环境基础数据库，对天山地区近年来地应力测量地点、深度、数值、方向和倾角做了整理。整理数据显示测量地点分布于天山各地区，天山地区最大主应力为北-南方向，中间主应力为西-东方向，最小主应力为西西北-东东南方向；天山地区三大主应力的关系为H h v。通过断层滑动反演方法，得到呼图壁地区的地应力状态，1方向为N19W，3方向为N71E，接近水平；2接近垂直，倾角为78，呼图壁地区主应力方向符合天山地区地应力规律，但主应力大小关系为H v h。通过对天山地区地应力数据的整理，发现了呼图壁地区与天山地区地应力之间的关系，为呼图壁地区的工程建设提供了一定的参考意义。

THE ANALYSIS ABOUT CHARACTERISTICS OF IN-SITU STRESS FIELD IN XINJIANG TIANSHAN AREA

The construction of the western region in China is accelerating gradually with the development of national economy. Exploring the characteristics of regional in-situ stress field can provide references to scientific research, mitigation of earthquake disasters and engineering construction. The article resumes four measurement methods widely used in Tianshan region which include hydraulic fracturing, overcoring method, earthquake focal mechanisms and fault slip data. Based on fundamental data base of crustal stress environment in continental China, this paper disposed the locations, depths, values, orientations and dips for in-situ stress measurement in recent years by means of literature search. The disposed data shows that the locations of in-situ stress measuring were widely distributed in Tianshan area. And the orientation of the maximum principal stress is N-S; the intermediate principal stress is W-E; the minimum principal stress is WWN-EES.The relationship of principal stresses is H h v.The state of in-situ stress in Hutubi area can be got by fault slip data. The orientation of 1 in Hutubi is N19W; and 3 is N71E which closes to horizontal. The dip of 2 is 78which closes to vertical. The orientations of principal stresses in Hutubi area which correspond Tianshan area, however, the relationship of principal stresses is H v h.The relationship of in-situ stress between Hutubi area and Tianshan area can be discovered by disposal of the in-situ stress measuring data in Tianshan area. It can provide reference to engineering construction in Hutubi area.