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研究区位于拟建的云南怒江某水电站坝区右岸电站进水口附近,斜坡主要由混合花岗岩和混合片麻岩组成,坡内受中缓倾河谷断层控制的变形破裂现象十分明显,虽然其宏观组合模式也表现为滑移–张裂,但是这些断层并未切脚出露,而是埋藏于坡脚以里或谷下一定的深度,按传统工程地质及岩石力学观点很难理解上述现象的成因。根据现场地质调查,结合其发育的地质、岩体力学环境条件的分析认为,上述变形破裂现象乃是在挽近地质时期河谷演化过程中,谷底(坡脚及谷下)岩体的风化软化所导致岸坡时效变形破裂现象,并通过数值模拟对其进行了论证。最后指出,对岩质岸坡演化而言,谷底(坡脚)软化效应是一种具有普适意义的斜坡地质作用。
The research area is located near the inlet of the right bank power station of the proposed hydropower dam in Nujiang, Yunnan Province. The slope is mainly composed of mixed granite and mixed gneiss, and the deformation and rupture controlled by moderate and moderate dipping fault in the slope is very obvious. Although its macroscopic combination The model also appears as slip-and-crack, but these faults are not exposed at the foot or the foot, but are buried at a certain depth in or below the foot of the foot. According to the traditional engineering geology and rock mechanics, it is difficult to understand the cause of the above phenomenon . According to the on-site geological survey and the analysis of its developed geology and mechanical conditions of rock mass, the above-mentioned deformation and rupture phenomena are the weathering and softening of the rock bottom at the bottom of the valley during the evolution of the river valley in the recent geological period Leading to deformation and rupture of bank slope aging, and demonstrated by numerical simulation. Finally, it is pointed out that the softening effect of the bottom (slope foot) is a universal geological significance for the evolution of rocky slope.