Study on the disaster mechanism and countermeasures of tectonic stress field in Xiangyun Basin of central Yunnan
The mutual extrusion and collision between the Asia-Europe plate and the India plate led to the strong uplift of the Qinghai-Xizang Plateau,the squeezing of crustal material into the northwest and central and western parts of Yunnan,the intense geological tectonic activity and frequent geological disasters.In order to explore the influence of tectonic stress field characteristics on geological disasters,this paper uses regional structural analysis method,joint analysis method,conjugate shear joint method and water system line graph method to invert the tectonic stress field in the study area,to explore the control effect of various geological structures on geological disasters,and to propose corresponding countermeasures for tectonically induced geological disasters.The results show that the north-east,north-west and near-east-west faults and joint structures are developed around the Xiangyun Basin,and the study area has experienced at least three tectonic stress fields through the intersection of faults and joints and the water system line diagram method,and the maximum principal stress σ1 has successively transformed from the north-east to the north-west to the near-east-west.The fault structure indirectly induces geological disasters by controlling the evolution of the water system.In the area,rivers such as Sancha River and Juli River are mostly developed along the fault zone,and geological disasters such as landslides and collapses are mostly distributed along the slopes on both sides of the rivers.The multi-period activities of the geological structure enhance the density of the fracture network system of the rock and soil mass,resulting in the development of geological disasters.For the prevention and control of geological disasters induced by structure,the effect of engineering management is poor,and this paper puts forward the countermeasures of optimizing the site selection of construction area,relocation avoidance and group survey and group prevention.
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