广西桂林市规划中心城区岩溶塌陷易发性评价

Evaluation of susceptibility of karst collapse in urban planning area of Guilin City of Guangxi Zhuang Autonomous Region

本文对岩溶地区岩溶塌陷易发性进行研究,利用地质环境要素通过专家-层次分析法对岩溶塌陷易发性进行评价,并通过MapGIS软件实现可视化。以桂林市规划中心城区为例,选取了岩溶发育程度、土层厚度、土层结构、第四系底部土层岩性、第四系底部土层液性指数、地下水年变化幅度、岩溶水承压性、塌陷密度、人类工程活动9个影响岩溶塌陷易发性的地质环境因素,建立了岩溶塌陷易发性评价指标体系和评价方法,并对研究区进行了评价,其成果可为桂林市规划中心城区的岩溶塌陷防治对策提供指导和借鉴。

This paper studies the prone zones of karst collapse in karst areas,evaluates the prone zones of karst collapse through expertanalytic hierarchy process with geological environment elements, and realizes visualization by MapGIS software. In a case study of urban planning area in Guilin, nine geological environment elements which influence the susceptibility of karst collapse are selected: the degree of karst development,soil thickness,soil layer structure,quaternary soil layer lithology,the liquidity index at the bottom of the quaternary soil layer,variations in groundwater in karst water pressure,the density of collapse and human engineering activities with susceptibility of karst collapse evaluation index system and evaluation method established and the study area evaluated. The results can be used to provide guidance and reference as prevention and cure of karst collapse for urban planning area in Guilin.