Assessment of susceptibility to karst collapse in the Qixia Zhongqiao district of Yantai based on fuzzy comprehensive method

This work builds on investigations of geology and the conditions of karst collapse of the Qixia Zhongqiao District of Yantai. A hierarchical index system is established using 5 evaluation factors including karst development， structure， overburden bed， hydrogeology and human activities. In order to improve objectivity and accuracy of the evaluation， the memberships functions of every index are constructed to calculate the weight of the evaluation factors using fuzzy mathematical theory. In terms of ArcGIS， assessment of karst collapse susceptibility in the study area is achieved. The results show that all of existing collapses are located in the areas extremely susceptible and susceptible to karst collapse， indicating that the assessment is reasonable. To control the possibility of karst collapse in these areas， it is necessary to strictly control the exploitation of groundwater.