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“5.12”汶川地震后,面积13余万km2山地的河谷或山谷斜坡区内[5],形成了大量的沉积物流堆积体、崩塌、滑坡、泥石流等次生灾害地质体。地震波效应后的斜坡松散岩土体及灾害地质体,在降雨、外力等作用下,稳定性迅速降低。地质灾害防治是一项困难、复杂的系统工程,全面系统地分析灾害地质体所处地质环境、变形历史、现状变形特征及演化趋势规律,防灾、减灾的对策措施才能有的放矢。
After the Wenchuan earthquake, more than 130,000 km2 mountain valleys or valley slopes [5] formed a large number of secondary geological disasters such as sediment deposition, collapse, landslide and debris flow. After the seismic wave effect, the slope loose rock mass and the disastrous geological body rapidly decrease in stability under the action of rainfall and external force. The prevention and control of geological disasters is a difficult and complicated systematic project. The geological environment, deformation history, current deformation characteristics and evolution trend of the disastrous geological body can be comprehensively and systematically analyzed, and the countermeasures of disaster prevention and reduction can be targeted.