库水水位下降对平顶水库边坡稳定性的影响

Influence of Reservoir Water Level Declineon Slope Stability of Pingding Reservoir

为了研究平顶水库库岸边坡的稳定性,建立三维数值分析模型,分析边坡坡度、渗透系数、水位下降速率对坡体孔隙水压力的影响以及库岸边坡稳定系数的影响。主要得到以下结论:采用两相流分析方法更能反映库岸边坡的实际工作效果;合理的库水水位下降的速率调配下,对渗流作用的土体孔隙水压力影响不大,渗透系数对孔隙水压力的影响较大,边坡坡度越大越有利于坡体内应力的消散;库岸边坡稳定系数随着水位高度下降呈现先减小后增大的变化趋势,渗透系数越大、边坡坡度越小、水位下降速率越小,边坡稳定系数越大,且渗透系数k与水位下降速率v的相对值是边坡稳定系数的重要影响因素。研究成果对于该水库库水位调控及边坡坡体稳定性的分析具有一定的参考价值。

In order to study the stability of the bank slope of the Pingding reservoir,this study established a three-dimensional numerical analysis model to analyze the influence of slope,permeability coefficient,and water level drop rate on the pore water pressure of the slope and the slope stability influence of the coefficient of the reservoir bank.The main conclusions are as follows:the two-phase flow analysis method can better reflect the actual work effect of the reservoir bank slope;under the reasonable adjustment of the rate of the reservoir water level drop,the soil pore pressure caused by seepage has little effect,and the permeability coefficient has little effect.The influence of pore water pressure is greater.The larger the slope,the better the stress dissipation in the slope;the slope stability coefficient of the reservoir bank shows a trend of first decreasing and then increasing as the water level drops.The larger the permeability coefficient,the greater the slope The smaller the slope,the lower the water level drop rate,the greater the slope stability coefficient,and the relative value of the permeability coefficient k and the water level drop rate v is an important factor in the slope stability coefficient.The research results of this study have certain reference value for the analysis of the reservoir water level control and slope stability.