秦堤高压喷射防渗效果分析

Analysis of Seepage Control Effectiveness for Qin Dike after High Pressure Jet Grouting

为了分析秦堤高压喷射防渗效果,了解加固后渗流各要素的空间分布规律,在研究区的工程地质、水文地质基础上,采用三维数值模拟计算方法,建立水文地质概念模型及数学模型,运用Visual Modflow软件,对无防渗墙和有防渗墙的防渗效果进行模拟和对比分析。结果表明:防渗墙周围水流密集,地下水等水位线发生明显偏转,防渗墙有效的降低了地下水位,明显减小了渗流速度,起到了阻水作用,取得了良好的防渗效果,并有利于堤基的加固。

In order to improve the effectiveness of high pressure jet grouting and to understand the spatial distribution law of various essential factors of seepage after reinforcement for the Qin dike, the 3-D numerical simulation calculation method was used to establish the hydrogeological concept model and mathematical model based on the engineering geology and hydrogeology conditions in the research area, and Visual Modflow software was applied to conduct simulation and comparison analysis of the seepage control effect of the dike with a cutoff wall and without a cutoff wall respectively. The results show that the cutoff wall is surrounded by more groundwater level contours, which significantly reduces head value and flow velocity, thus taking water-tight effect, bringing about satisfied seepage control and benefiting reinforcement of the dike foundation.