云阳某顺层岩质滑坡成因机制分析与稳定性评价

Genesis Mechanism Analysis and Stability Evaluation of Bedded Rock Landslide in Yunyang

该滑坡位于长江北岸岸坡云阳段,总体积在2000×104m3以上,目前正处于匀速滑动阶段后期。本文在深入分析滑坡体的地质特征、构造特征、变形特征的基础上,对滑坡体的成因机制及影响因素作了深入研究;并采用折线型滑面条分法和传递系数法对滑坡体的稳定性状况作了评价、预测。研究表明,该滑坡体目前处于欠稳定状态,在三峡库区水位上升或骤降,以及遭受较以前时间更长、强度更高的暴雨时,滑坡体的稳定性将随之降低,甚至整体失稳。

The landslide lies in the slope of northern bank in Yunyang section of Yangtze River with a volume of more than 20 million m^3. It is in the late even sliding state. Based on geological characteristics, structural feature and deformation features, this paper has further study on genesis mechanism and influencing factors, meanwhile, by using both slice method of slip surface in fold line and transfer coefficient method, the evaluation and prediction of stability have been made. It shows the landslide which is not stable may decrease its stability or be instable when either water level of Three Gorges Reservoir area increase and sudden drawdown or encountering longer and stronger rainstorm as before.