Study On The Distribution Law And Formation Mechanism Of Ground Fissures In Dali County

In China,ground fissures are a serious geological disaster.Among them,the ground fissures in Dali County,Guanzhong Basin are more serious and typical.With the development of the western region and the implementation of the national strategy of the two belts and one road,large-scale urban expansion and the construction of some major projects will inevitably cross the disaster-causing area of ground fissures.This paper takes Dali ground fissures as the research object and conducts research on the distribution law and formation mechanism of the ground fissures in Dali County,which has positive theoretical and practical significance for disaster prevention and mitigation in Dali County and urban construction planning.Based on systematic field investigation and field mapping of ground fissures in Dali County,this article basically found out the types,distribution and basic characteristics of ground fissures in the study area,and found that the ground fissures in the study area have obvious distribution rules and scales Larger structural ground fissures are mainly distributed along geomorphic boundaries or active faults.Collapsible ground fissures are mainly distributed in the loess terraces and the Weihe high-level terraces,and are caused by the leakage of water channels or sewage pits.By collecting relevant geological data and in-depth understanding of the geological environment background of the study area,a geological model of ground fissures in Dali County was established.Based on Flac3 D finite element numerical simulation,the ground fissures in the secondary structural unit of the Gushi Sag in the Weihe Basin where the study area was located were revealed.Grouping mechanism;based on the cantilever beam theory,the formation mechanism and evolution process of collapsible ground fissures are analyzed,and the potential location of collapsible ground fissures cracking is analyzed.