Research and application of a karst ground collapse risk assessment information system in Shenzhen Universiade Center (China)

摘要

To ensure the project safety of Shenzhen Universiade Center and normal use of the facilities, it's necessary to study the distribution rules of karst and predict the risks of Karst ground Collapse to provide a reference for prevention and control measures. With the support of MAPGIS software, a risk assessment information system of karst ground collapse in Shenzhen Universiade Center was researched and developed, which realized the automated process from basic data input to the result assessment of karst ground collapse. System functions include data input and output, data query, database generation assessment, model parameter calculations assessment, model features assessment, and result mapping assessment. The paper analyzed all possible factors that may affect karst ground collapse and obtained six important factors — distribution of dissoluble rock, cover thickness, groundwater level, karst development degree, building importance and structure. The weight coefficients of three grades of indexes were obtained by using AHP to analyze the six factors. The site was divided into 6843 grids by the size of 10m ∗ 10m. The assessment results showed that 1.461% of the site is high-risk area, 8.666% is relatively higher risk area, 23.805% is less dangerous area, and 66.068% is low-risk area. Such assessment results can be used as reference for follow-up processing of the site.