三峡库区凉水井滑坡地质力学模型研究

针对凉水井滑坡两个不同的地质模型（地质模型一及地质模型二）进行了对比研究，认为地质模型二较为合理，即凉水井滑坡是顺层岩质古崩滑堆积体，目前还未形成统一连续的滑带，滑坡按不同的堆积形成秩序及稳定性相关关系分为主滑坡和后部牵引区。并对滑坡的影响因素及变形机制进行了简要分析，认为启动滑坡变形裂缝的根本原因是水库初期蓄水时库水对滑坡阻滑段的浮托、阻滑段滑带的软化和滑坡前缘表部松散坡体的侵蚀塌岸；而在水库运行条件下，滑坡的稳定性影响因素主要是降雨特别是暴雨和久雨。滑坡稳定性分析表明，滑坡自2009年5月以来一直处于缓慢的应力调整和应力释放过程中，滑坡变形总体处于蠕变状态。此外，还对滑坡的破坏模式及稳定性进行了预测分析，认为在未来特大暴雨久雨条件和库岸再造的共同作用下，滑坡表部岩土体将首先发生滑塌（模式一），也有发生滑坡整体深层滑动破坏的可能（模式二）。

Study of geomechanical model of Liangshuijing landslide in Three Gorges Reservoir area

Through comparative study of two different geo-models of Liangshuijing landslide, it concluded that Liangshuijing landslide is in fact a paleo-falling and sliding rock accumulation without forming a whole and continuous “sliding belt”, and the landslide is divided into two parts named as the main sliding part at middle-below and the towed part at the up in terms of the landslide structure and the accumulation sequences. Also, the deformation mechanism has been researched, coming out the conclusion that the landslide initial deformation is due to the coupling process of reservoir water softening, uplifting and the river bank slumping; while in the condition of the reservoir operation, the main influencing factor of the landslide stability is rain fall, especially storm and long-time rainfall. It is also concluded from stability study that from May 2009 the landslide has entered the state of creeping by a slow process of stress releasing. Furthermore, from the prediction analysis of stability and failure mode, there comes the results that in the condition of reservoir operation, by coupling of strong and long-time precipitation and reservoir triggered bank slumping, the surface part of the main sliding body will be sliding firstly(sliding model 1), and the sliding of the whole landslide is also possible (sliding model 2).