Study On The Formation Mechanism Of Ground Fissures In Secondary Blocks Of Gushi Depression In Guanzhong Basin

China is one of the countries most affected by ground fissures,especially in the Guanzhong basin,which is more severe and typical.Guanzhong basin has its own historical records since the ground is the frequent cracks,a serious threat to the people's property and life safety.And with the development of the western region and the implementation of the two-way strategy,large-scale urban infrastructure construction,such as Xi'an's underground rail transit line,Datong high-speed rail and other projects will inevitably cross the ground fissure area,so the Guanzhong basin It is very necessary to study the genesis of internal fractures in the block body.This paper mainly studies the genesis mechanism of ground fissures in secondary blocks of Gushi depression.Based on the field investigation and field mapping of ground fissures in the study area,this paper basically finds out the distribution of ground fissures and the basic characteristics in the study area,and reveals that the ground fissures have a good consistency with the moving faults.Through the collection of relevant geological data,we can get a better understanding of the geological environment background of ground fissure development in the study area,reveal the engineering disaster characteristics and disaster pattern of ground fissures.Finally,by analyzing the development characteristics of typical fractures in the study area,and the conclusion of the previous research results,the mechanism of the ground fissures in the secondary block of the Gushi depression in Guanzhong basin is pointed out.At the end of this paper,the origin mechanism of the tectonic ground fissures in the secondary block of the Gushi Depression in Guanzhong basin is obtained as follows: the formation and evolution of the tingling ? earthquake contact ? rainfall(irrigation).The mechanism of the formation is as follows: 1,the control effect of the rupture structure on the formation of ground fissures;2,the induced effect of seismicity on the formation and development of ground fissures;and 3,the effect of rainfall(irrigation)on the formation and development of ground fissures.