库岸边坡承压水成因及作用分析

Analysis on Formation Cause and Action of the Confined Water on Bank Slope of Reservoir

降雨和库水位升降是导致库岸边坡失稳的重要因素。瓦依昂水库滑坡、秭归县千将坪滑坡和罗家坪滑坡等系列工程实践表明,在考虑降雨和库水位两者联合作用下,计算出库岸边坡的安全系数仍偏高。通过库岸边坡承压水模型对库岸边坡失稳的因素进行分析,结果表明:采用承压水模型计算出的安全系数远小于传统方法,这是导致很多岸坡在进行前期勘探分析稳定却产生滑动的原因,因而对符合承压水模型形成条件的岸坡进行分析时,承压水头不容忽视。可为水库岸坡的监测预警及治理方案提供基础依据。

The rainfall and the water level rise and fall of the reservoir are important factors leading to the instability of the bank slope.The practice of the series of works such as the Vaion Reservoir landslide,the Qianjiangping landslide in Zigui County and the Luojiaping landslide shows that the safety factor of the bank slope is still high under the combined effect of rainfall and reservoir water level.The factors affecting the instability of the bank slope are analyzed by the confined water model of the bank slope.The results show that the safety factor calculated by the confined water model is much smaller than the traditional method,which leads to the pre-exploration analysis of many bank slopes.Stabilization produces the cause of slippage.Therefore,when analyzing the bank slope that meets the conditions for forming a confined water model,the confined head cannot be ignored.It can provide a basis for monitoring and early warning and treatment plans for reservoir bank slopes.