Partition Of Likelihood Of Ground Subsidence Occurrence In Some County In Hunan Province And The Study On Formation Mechanism Of Ground Subsidence

This area is typical ground subsidence of geological disasters area, karst collapse is developed. Ground subsidence is aggravated by mining of mineral resources, has been a serious threat to the local people’s normal life and production, urban economic construction development.After collecting the history data of ground subsidence and regional geological disaster survey, researching by drilling, geophysical prospecting method, etc. we found out the regional geological conditions of the ground subsidence development, found the regional karst development law and the distribution regularity of ground subsidence of geological disasters, analyzed the influence to regional ground subsidence by factors of landform, stratum lithology, structure, karst development and groundwater dynamics, human engineering activities, etc. According to the types of regional subsidence, we studied various kinds of mechanical effects of the geological conditions and built the basic model and the formation mechanism. On the basis of comprehensive analysis of the influence factors of regional subsidence, forecast and evaluation mode of Karst ground collapse is established, the analytic hierarchy process is used to determine the weight coefficient, and comprehensive index method is used to evaluate the possibility of surface collapse. The area is sampled after grid subdivision, comprehensive rating value of each sampling unit is calculated. The area is partitioned by the results of Karst ground collapse comprehensive prediction, after merging similar values. We put forward the rule of "People-oriented, relying mainly on immigration and monitoring while taking Project to improve as secondary reliance".Regional environment, cause, mechanism, influencing factors and development trend were analyzed and evaluated together in this paper. The comprehensive forecast method is reliable, forecast result accords with the actual situation. The results of the study on the effective prevention and control of regional subsidence of geological disasters has important guiding significance...