汶川地震四川重灾区地质安全综合评估

Geological safety evaluation for Wenchuan earthquake severe hit area in Sichuan Province

摘要: 以四川12个地震重灾县为研究区,在详细收集分析地震前后相关资料的基础上,开展了研究区灾后恢复重建的地质安全综合评估。首先在综合分析历史最高洪水位、25°坡角、活动断裂、沟谷稳定性、地质灾害易发性5项因子的基础上,划分出不宜建区和相对宜建区;再对相对宜建区开展地质安全综合评估,利用GIS软件的空间分析叠加功能,在对相对宜建区进行多边性网格单元剖分的基础上,选取地形地貌、活动断裂及区域地壳稳定性、斜坡稳定性、地质灾害易发程度4项指标进行单独分级评价,然后按照取差原则综合上述各单因子评价结果,进行综合评价,划分出了相对安全区、次安全区、不安全区,为灾后恢复重建工作提供了地质安全依据。

Abstract: Geological tectonics,faults and geohazards are active in Wenchuan earthquake hit area.Geology is of much importance in reconstruction process.12 counties which were seriously destroyed by Wenchuan earthquake are taker as the research areas to carry out geological safety evaluation.Firstly,flood,25°slop,active geological fault,slop stability and geoharzads are selected as indexes to divide suitable or un-suitable areas for construction;Secondly,select the suitable area to carry on geological safety evaluation,the areas are divided into better,medium and worse for reconstruction zonation.