"5.12" Wenchuan earthquake in the formation of a large earthquake shattered unstable slopes, most of which occurred in the thick layer of accumulative formation, the pattern of secondary geological disasters has a special theor of phyical destroy. A case study of unstable slopes in Xiaojin County, research the elevation, terrain slope, soil structure conditions on the dynamic response of slopes, preliminary analysis of the thick layer of colluvial slopes shattered deformation and failure mechanism. Deemed, under the action of the earthquake dynamics, the thick layer of seismic slope deposits are often a potential phenomenon of multi-level sliding surface, and the fracture plane more than some of the layers along the slip surface damage occurred. This is related of the depth and extension of seismic fractures on the slpoe,formed by the earthquake instantaneous tensile failure. Total,the shattered unstable slope instability can be considered earthquake physical parameters of soil decreased slope after the earthquake ground water under the action of softening the cumulative damage results.%“5.12”汶川特大地震形成了震区大量的震裂不稳定斜坡,其中绝大部分发生在厚层堆积层斜坡中,这类次生地质灾害有着特殊的力学破坏机制.以小金县某不稳定斜坡为例,研究了高程、地形坡度、岩土体结构条件等对斜坡动力响应的影响,初步分析了厚层堆积层震裂斜坡的变形特征及破坏机制.认为,在地震动力作用下厚层堆积物斜坡往往出现潜在多级滑动面的现象,且破裂面多沿着堆积层中某些曲面发生滑动破坏,这与地震瞬间拉张破坏在斜坡体中产生的震裂缝深度和延伸有关.总的来说,震裂不稳定斜坡的失稳可以认为是地震使边坡岩土体力学参数降低、震后地下水的软化共同作用下累计破坏的结果.
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