溪洛渡库区河口滑坡变形特征和形成机制

溪洛渡库区河口滑坡位于金沙江下游溪洛渡水电站东南岸坡上，永善县城至大兴集镇、莲峰镇公路横穿滑坡。滑坡一旦失稳将切断两个镇的生命线，甚至对库区形成危害。论文在现场地质测绘、勘察和数值模拟的基础上，对河口滑坡的变形特征和形成机制进行了研究。研究表明:河口滑坡是一个大型深层岩质滑坡；变形特征上可分为强变形区、弱变形区和松弛区；破坏模式上可分为前缘倾倒破坏模式和中后部滑移破坏模式；滑坡整体变形模式为倾倒-滑移-拉裂-剪断模式。滑坡主要影响因素有库水作用、地质构造、卸荷作用；河口滑坡若继续在库水作用和卸荷作用的影响下将继续变形。

Study on Deformation Characteristics and Formation Mechanism of Hekou Landslide in Xiluodu Reservoir Area

The Hekou landslide in the Xiluodu reservoir area is located on the valley slope on the southeast bank of the Xiluodu Hydropower Station in the lower reaches of the Jinsha River. The highway from Yongshan County to Daxing Town and Lianfeng Town crosses the landslide. Once the landslide loses stability, it will cut off the lifeline of the two towns and even harm the reservoir area. On the basis of on-site geological surveying, investigation and numerical simulation, the paper studied the deformation characteristics and formation mechanism of the Hekou landslide. Research shows that: Hekou landslide is a large deep rock landslide; the deformation characteristics can be divided into strong deformation zone, weak deformation zone and relaxation zone; deformation mode can be divided into dumping zone and slip zone; the overall deformation mode of the landslide is dumping- Slip-crack-cut mode. The main influencing factors of landslide are reservoir water action, geological structure, and unloading action; if the estuary landslide continues to deform under the influence of reservoir water action and unloading action.