库水位升降对某水库浸水滑坡体稳定性影响评价

Influence of Reservoir Water Level Fluctuation on Stability of a Reservoir Immersion Landslide

笔者以保丰水库围子坝滑坡体为例,研究水库水位升降对滑坡体稳定性的影响。利用Geo-Studio软件的Slope/W模块建立现状水位、水库蓄水至正常蓄水位、校核洪水位骤降至滑坡体前缘以下3种工况模型,并采用不同库水位的不同参数,对滑坡体稳定性进行了计算分析评价。结果表明:在校核洪水位骤降至滑坡体前缘以下工况的滑坡体整体处于不稳定状态,随时可能发生变形破坏;在现状水位、蓄水至正常蓄水位2种工况下,虽然滑坡体整体处于稳定状态,但局部存在可能的滑移变形区;水库对滑坡体淹没深度、库水位下降快慢和参数与滑坡体稳定性存在一定的变化规律。研究成果对类似滑坡体稳定性研究具有一定的参考价值,对水库运行管理调节具有重要指导意义。

Taking the Weiziba landslide of Baofeng Reservoir as an example the influence of reservoir water level fluctuation on the stability of landslide is studied.By using the Slope/W module in Geo-Studio three working condition models were established including the current water level the reservoir impoundment to the normal water level and the check flood level plummeted below the front edge of the landslide.The stability of the landslide was calculated and evaluated by using different parameters of different reservoir water levels.The results show that the landslide is in an unstable state under the condition that the check flood level drops sharply below the front edge of the landslide and deformation and failure may occur at any time Under the two conditions of current water level and water storage to normal water level although the landslide is in a stable state as a whole there is a possible slip deformation zone in the local area The reservoir has a certain change rule on the submerged depth of the landslide the speed of the reservoir water level drop and the stability of the landslide.The research results have certain reference value for the study of similar landslide stability and have important guiding significance for reservoir operation management and regulation.