水位变动对库区边坡稳定性的影响机理研究

Research on the Stability of Reservoir Slope and the Corresponding Influence Mechanisms Induced by Fluctuation of Water Level

利用数值模拟手段,对选定的库区边坡进行稳定性分析,得到了不同水位变动情况下的边坡稳定情况。认为水位的变动类型和变动率会对边坡的稳定造成影响,但影响效果不一样。从数学解析角度出发,推导出了库区水位上升与下降时,水力梯度与水流渗透方向、边坡倾斜角度三者之间较为理想化的关系形式。在此基础上,对边坡体内不同部位的水流情况以及所带来的影响进行了分析。进一步的,还从有效应力的角度,对水位变动影响边坡稳定性的机理进行了研究,且由不同方法所得的结论能够较好的相互印证。

A typical slope which is located in the reservoir region is taken to be analyzed using the simulation method and some results about the stability of slope which is under different conditions of water level fluctuation can be obtained.Based on these results we can know that both the type and rate of water level fluctuation can influence slope stability,and different conditions will induce different effects.In this paper we provided an analytical method to obtain an ideal relationship among hydraulic gradient,seepage direction and slope angle.Effort was devoted to studying the water flow characteristics and corresponding influence.Furthermore,starting from the aspect of effective stress theory,this paper also paid attention to the influence mechanisms induced by water-level fluctuation,and all the results obtained by using these methods can well be consistent with each other.