基于Flac-2D的河水下降对顺层边坡稳定性影响分析

Analysis of Influence of River Decline on Stability of Bedding Slope Based on Flac-2D

为了研究河道水位下降过程中顺层边坡稳定性变化趋势,结合一典型的河岸顺层边坡工程,通过采用有限差分软件Flac-2D建立边坡稳定性计算模型,研究水位下降过程中坡体渗流场和变形趋势,量化水库运行过程中边坡的稳定性演变趋势,结果表明:(1)水位下降过程中,坡体平均有效应力方向基本平行坡面方向,随着坡体深度增加,平均有效应力不断增大;(2)随着水位下降,坡体发生位移变形区域逐渐往下发展,分布范围有逐渐增大趋势,且始终位于水位与坡面相交位置附近;(3)边坡安全系数随着水位降落均呈现先减小后增加趋势,但总体表现为随水位降低安全系数减小。研究成果可为水位下降过程中坡体内应力应变特性研究提供参考。

In order to study the river water level decline process of bedding slope stability trend,with a typical bank slope project, the slope stability calculation by using Flac-2D to establish the finite difference model ,the research level decline of slope in the process of seepage field and deformation trend,evolution trend,the stability of the slope in the reservoir operation process of quantitative results showed that ： (1)water level drop in the process,the slope average effective stress direction substantially parallel with the slope direction ,slope depth increases,the average effective stress is increasing; （2）as the water level dropped,the slope occurred deformation region gradually grows,the distribution range increased gradually ,and always at the level and slope position near; （3）the slope safety coefficient with the drawdown decrease ＂after increasing trend,but the overall performance is reduced with the water level The safety factor is reduced.The research results can provide a reference for the study of the stress and strain characteristics of the slope in the process of water level decline.