广州地铁地质灾害危险性预测评估

Assessment of geological hazards along Guangzhou Subway

论文以广州地铁二、八号线为例,根据《广东省地质灾害危险性评估实施细则(试行)》[1],结合拟建地铁所处地质环境背景、铁路工程技术标准、施工方式及工程结构要求,预测工程项目在建设中及建设后,可能引发或加剧的地质灾害类型主要有隧道围岩失稳、岩溶地面塌陷、基坑突水、地面沉陷和基坑边坡失稳等;工程建设可能遭受的地质灾害有断裂活动破坏、桥梁地基失稳及地震砂土液化。预测分析选取的评价要素主要为工程地质条件、水文地质条件、构造地质条件、地形地貌条件、气候条件及工程施工条件等。

The No. 2 ＆ No. 8 lines of Guangzhou subway are taken as the example of this passage. Comparison and analysis are made every geological calamity of the area to be assessed in conjunction with the geological background at the site where the subway is to be constructed, technique standard of subway construction, construction method and requirement of construction structure. Then it＇ s predicted that there would be five sorts of geological calamities to be caused or intensified in the process or in the wake of the construction project as follows ; instability of the wall rock of the tunnel ; collapse of the karst grade; water inrush of pit; cave in of the ground; and instability of slopeof pit. The geological calamities that the project may suffer are three as follows：the destruction of rupture activity; and the instability of bridge foundation and liquation of earthquake sandy soil. The main assessment factors chosen for the forecast and analysis are： the geological condition of the project, the condition of geology and hydrology; the condition of structural geology; the condition of topography and landform; and the condition of climate and the condition of project construction.