多头小搅拌桩截渗墙技术在堤坝防渗中的应用

首次选定了多头小直径水泥土搅拌桩截渗墙方案用于解决中运河张庄-窑湾和柳林两险工段堤坝渗漏问题。在正式施工之前,通过做截渗围井试验和生产性试验进行了论证;通过探地雷达分析表明两段墙体的连续性和完整性较好,墙体对周边坝体的疏松土体有明显的改善;通过截渗墙施工前后断面两测压管水头差和渗透系数的计算分析与对比,也说明了这两段所施工的水泥土截渗墙具有明显的截渗效果,满足了设计的需要。

Application of the deep mixing method in construction of the cement-soil seepage interception wall for dyke seepage control

Cement-soil seepage interception walls are constructed by the small diameter deep mixing machine with three broaches to resolve dyke seepage at the Zhangzhuang-Yaowan section and the Liulin section.The digging well penetrative test,structure analysis and calculation and the production test are carried out before full scale construction.The analysis results of ground penetrating radar show that the walls at the two sections have good integrity and continuity and they have improved the loose soil markedly.The piezometric heads are observed and the permeability coefficient is calculated,and the results proved that the anti-seepage effect of the cement-soil seepage interception wall is obvious.The successful application of this technique in consolidating the dyke extends the application range of the technique and pushes forward its development.