基于FLAC3D的围堰边坡稳定流-固耦合分析

应用FLAC3D对某围堰体及覆盖层的边坡稳定进行了流-固耦合分析。基于Darcy定律和Biot方程,考虑堰体边坡或者覆盖层开挖,以及防渗墙上游有无土工膜对围堰边坡稳定的影响,对施工过程中的4种工况进行了模拟。计算结果表明:下游覆盖层的开挖对围堰体及覆盖层边坡稳定的影响是局部的,对围堰和覆盖层的整体稳定没有产生较大的影响;上游堰体铺设的土工膜对围堰防渗有一定的效果,能够减小渗流量,有效减少塑性破坏区的范围,增加围堰的稳定性。

Study on the Hydro-Mechanical Coupling of Cofferdam Slope Stability Based on FLAC3D

Hydro-mechanical coupling of cofferdam slope stability was studied in this paper by FLAC3D.Based on Darcy Law,the fluid-solid coupling process was basically satisfied Biot Equation.Four work conditions of construction process were simulated considering the influences to the stability of cofferdam slop by the excavation of cofferdam slop or overburden and whether there was geomembrane on the upstream cutoff wall.It is indicated that the impact caused by the excavation of downstream overburden to the cofferdam and the stability of overburden slope is partial and cannot impact the whole stability;while the geomembrane laid on upstream cofferdam is effective in seepage control,which can reduce seepage discharge and plastic yield areas to improve the stability of cofferdam.