悬挂式防渗墙防渗效果数值模拟

Numerical Simulation of Seepage Control for Suspended Cut-off Wall

鉴于数值模拟技术在模拟土体渗流方向上几乎不受外界干扰、计算可重复性高等优势,以室内砂槽模型试验为背景,采用有限差分软件FLAC3D模拟了双层堤基中悬挂式防渗墙的贯入深度、布置位置对渗透变形的影响。结果表明,悬挂式防渗墙防渗效果随贯入深度的增加而更为显著;防渗墙布置在靠近下游位置时可抑制渗透变形在墙后背水侧发展,从而避免堤身沉降出现溃堤事故;数值模拟结果与室内模型试验数据基本吻合,说明运用数值模拟分析渗透变形是可行的。

Numerical simulation technology has some advantages for simulating soil seepage, such as preventing external interference and high computing repeatability. In the background of indoor sand slot model test, the influence of the depth and position of the suspended cut-off wall on the seepage deformation is simulated by using finite difference software FLAC3D. The results indicates that the influence of preventing seepage was more significant with the increasing depth of the seepage~ arranging cut-off wall near the downstream could help make the seepage deformation develop in rear of the wall to avoid levee collapse accident; the numerical simulation results is basically consistent with indoor model test data. Thus, it is feasible to analyze seepage deformation with numerical simulation.