库区边坡稳定性随水位波动变化规律研究——以龙羊峡库区查纳和查东滑坡为例

Research on Reservoir Slope Stability with the Water Level Fluctuation Change Law —Taking Chana and Chadong Landslides in Longyangxia Reservoir Area as an Example

摘要: 为研究库水位的波动对库岸边坡稳定性的影响，以龙羊峡水电站库区查纳和查东滑坡为例，结合现场调查、地质勘测数据以及水库运行资料，同时针对库水位波动情况，利用有限元分析软件设置不同水头变化函数来计算，进而分析岸坡的稳定性系数随库水位波动的变化规律。结果表明：在一个水文年内，查纳滑坡的稳定性系数变化趋势与库水位变化呈正相关，水位下降会引起边坡稳定性降低，反之则会升高，且水位变化速率越快，稳定性系数的变化也会相应加快；查东滑坡受其坡体结构的制约，稳定性与库水位的变化没有明显的关联性，除了在水位快速下降时会出现稳定性系数骤降骤升的情况外，在一个水文年内，稳定性变化不大。

Abstract: In order to study the influence of the fluctuation of reservoir water level on the stability of the bank slope, taking the Channa and Chadong landslides of Longyangxia Hydropower Station reservoir as examples, combining the field investigation, geological survey data and reservoir operation data, and aiming at the fluctuation of reservoir water level, the finite element analysis software is used to set different head change functions to calculate. Then the stability coefficient of bank slope varies with the fluctuation of reservoir water level. The results show that in a hydrologic year, the variation trend of stability coefficient of Chana landslide is positively correlated with the change of reservoir water level, the decrease of water level will lead to the decrease of slope stability, and vice versa, and the faster the change rate of water level, the change of stability coefficient will accelerate accordingly. Restricted by the slope structure, there is no obvious correlation between the stability of Chadong landslide and the change of reservoir water level. The stability of Chadong landslide has little change in a hydrological year except that the stability coefficient plummets and rises sharply when the water level drops rapidly.