广州市白云区金沙洲地区地质灾害风险区划

广州市白云区金沙洲一带因受武广高铁隧道等一大批重点工程项目施工中大量抽排地下水的影响，诱发了多次较为严重的地质灾害。文章在多年实地调查的基础上，系统分析其地质灾害致灾因子，建立了地质灾害易发程度分区的评价指标体系，采用信息量法，按照地质灾害易发程度对各评价单元划分等级，将金沙洲地区划分为4个区：高易发区、中易发区、低易发区和不易发区。其中，武广高铁隧道通过的中南部地区属于地质灾害高易发区，该区隐伏岩溶发育，地质环境脆弱，不适宜大规模开发建设；浔峰断裂（F3）、沙贝断裂（F4）及保利西子湾断裂（F5）3条断裂通过的东部地区为地质灾害中易发区，该区发育有不良岩土体，区内主要发生地面沉降地质灾害；东南部大塱山组和中部测水组非可溶岩地层区为地质灾害低易发区，该区以埋藏型可溶岩分布为主，总体发生地质灾害的概率较小；西部丘陵地带为地质灾害不易发区，为非可溶岩区，不具备孕育地质灾害的形成环境。

Regionalization of Geological Disaster Risk in Jinshazhou Area,Baiyun District,Guangzhou

With the rapid development of the city of Guangzhou, human engineering activities have exacerbated the natural environment. In recent years, a large number of key projects construction have been completed, such as the Wuhan-Guangzhou high-speed railway, several serious geological hazards have occured in Jinshazhou area. In this paper, on the basis of the field surveys for years, the causal factors of the geological disasters are analyzed systematically, an evaluation index system is established, and the evaluation methods of geological hazard susceptible degree are presented. According to the geological disaster evaluation grade, Jinshazhou is divided into four regions, which are high risk region, medium risk region, low risk region and least risk region. The central and southern parts of Jinshazhou where the Wuhan-Guangzhou high-speed rail tunnel passes through are of high risk region of geological hazard occurrence. In that region there are buried karst areas, the geological environment is fragile, and large-scale construction is inappropriate. The eastern part of Jinshazhou, where Xunfeng fault(F3), Shabei fault(F4) and Baoli Xiziwan fault(F5) pass through, are of medium risk region. In the region there are adverse rock soil masses, and the major geological disaster is land subsidence. The southeast and central parts of Jinshazhou, where there are less soluble rock strata, are of low risk region. The western part of Jinshazhou is a hilly area and is of the least risk region, where there develops no karst and have no basic condition for geological disasters.