大渡河上游某水电站滑坡体成因机制及稳定性研究

滑坡体位于大渡河上游某水电站闸址右岸，最大厚度73m，据勘探平洞揭露，滑坡体内存在大量假基岩，基本保持一定层序，大部分层理倾向坡外，具有一定的规律性。在深入调查滑坡体基本特征的基础上，结合滑坡体的赋存环境，查明其形成地质力学模式为蠕动-滑移-拉裂破坏模式，以垂直位移为主。最后采用地质分析和极限平衡对滑坡体稳定性进行了综合评价。结果表明，滑坡体的影响因素多数有利于稳定性，在各工况下均满足安全标准，其成果可为拟建工程提供重要参考。

Study on Formation Mechanism and Stability of the Landslide at Hydropower Station on the Upstream of Dadu River

The landslide is located on the right bank of a Hydropower Station dam site at the upstream of Dadu River. Its maximum thickness is 73m. The exploration adit exposes, a large number of false bedrock exist in the landslide body, which have a certain rule that maintain a certain sequence and most of the bedding tend to slope outside. In the thesis, it is ascer- tained that the geomechanics mode is Peristalsis-slip-crack failure mode that mainly with vertical displacement, based on depth investigation into the basic characteristics of the landslide, and combined with the occurrence environment of land- slides. Finally, the landslide stability is evaluated synthetically through geological analysis and limit equilibrium. The results show that, majority of the influencing factors conducive to stability, which meet the safety standards under all conditions. The results provide an important reference for the proposed project.