5·12"汶川特大地震不仅大幅度降低了地震区斜坡的稳定性,而且还诱发了大量滑坡等地质灾害.通过对灾区地震滑坡灾害进行野外深入调查,对"5·12"大型典型地震滑坡的基本特征等进行归纳、总结,并以青川县东河口滑坡为例,对该大型滑坡的基本特征及失稳破坏模式进行分析.分析得出,东河口滑坡是一个强震作用下的高速远程型坡体运动,其运动阶段大致可分为启程滑动、近程飞越、碰撞和远程流动3个阶段.该滑坡的失稳破坏模式可简单概括为拉裂一裂纹扩展、趋于贯通一斜坡失稳、凌空滑出一滑坡解体、流动一堆积.

The stability of slopes in earthquake disaster areas has not only been largely decreased by"5·12"Wen-chuan earthquake, but also a large number of geological hazards such as landslides and so on, have been induced in the areas. On the basis of thoroughly surveying on the landslides induced by the earthquake in the disaster areas, basic characteristics of the typical landslides was summarized. Taking the Donghekou landslide of Qingchuan county as an example, basic characteristics and deformation failure mode of the large-scale landslide was analyzed and discussed. The results showed that the landslide belongs to high-speed and long-distance slope movement in the action of intense earthquake. The movement stage can be approximately separated into three stages of sliding in setting out, flying and colliding of short-distance, and flowing of long-distance. The destabilization failure mode can be simply generalized into tension→crack extended, running-through→slope instability and flying off→landslide disag-gregation, flowing→deposit.