2011年9月16日，四川省南江县特大暴雨诱发了1571处滑坡，造成众多人员伤亡和财产损失。在这些滑坡中65％以上是堆积层滑坡。为了探讨南江县平缓堆积层边坡的滑动失稳机制，作者利用大型离心模型试验，再现了强降雨引起红层地区堆积层边坡的滑动失稳的全过程，获得了边坡变形破坏的特征参量。试验结果表明：天然情况下，边坡变形以沿基覆界面软弱层的蠕滑为主，坡体总体处于蠕滑变形状态；降雨情况下，坡体中后部拉张破裂变形显著，并最终产生整体滑动。通过模型和原型的综合对比分析，该边坡的滑动失稳机制为以蠕滑拉裂为基础、暴雨形成的裂隙静水压力为触发滑动的力学动因。
The Nanjiang rainstorm induced 1571 landslides,causing many casualties and property losses on September 16,2011.More than 65% of these landslides are the debris accumulation landslides.They slide mainly along the base cover interface.In order to explore the sliding instability mechanism of the gradual accumulation slope in Nanjiang,the authors simulate the whole landslide process and the characteristic parameters of deformation under rainfall by centrifugal model tests.The centrifugal model test results indicate that the deformation is mainly the slope creeping of the soft layer and the slope appears creeping state.Under natural conditions,the tensile fractures of the rear of the slope body are obvious and finally the slides occur under rainfall.Comparing the model test with the prototype test,it is found that the sliding mechanism of the slope is based on the creep cracking basis and the fissure hydrostatic pressure formed by rainstorm is the mechanics to trigger a sliding.
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