郁江流域堡上滑坡形成机制及稳定性分析

The Formation Mechanism and Stability Analysis of Baoshang Landslide in Yujiang River Valley,Southwestern Hubei Province

根据堡上滑坡的工程地质条件,分析了滑坡的形成机制,堡上滑坡变形破坏主要是受降雨及库水位变化的影响。在野外调查及勘查的基础上应用垂直条分法对滑坡的稳定性进行了计算,计算结果表明,在自重+408 m现状库水位的天然状态下,滑坡处于基本稳定状态,与现场调查所得结论一致,在暴雨和库水位变化的情况下,堡上滑坡稳定性系数逐渐降低,当库水位从415 m骤降至400 m时,堡上滑坡将处于临界滑动状态,滑坡不稳定。

The engineering geologic condition of Baoshang landslide is analyzed for reveal the formation mechanism of it,which comes to the conclusion that the rainfall and change of reservoir water level is the most important factor to induce this landslide.According to the field investigation and exploration work,the vertical slicing method is used to calculate the stability of Baoshang landslide,the result shows that in the situation of self-gravitation at ＋408 meter current water level,this landslide is under the state of fundamental stability,which is matches the conclusion of field investigation.But under the cases of the storm and the changes of the water level,the stability coefficient of Baoshang landslide is gradually declining,the landslide will be in critical slipping status in the situation of storm and the water level change from ＋415 meter to ＋400 meter,the landslide will be unstable.