为高效解决深基坑工程地下连续墙渗漏水问题,依托南宁地铁3 号线金湖广场站富水深基坑工程,开展声呐渗流检测技术应用研究。首先,对65 幅地下连续墙止水帷幕实施声呐渗流检测,得到相应位置流速、流向、流量和渗透系数等数据,反演绘制三维可视化渗流场,准确定位地下连续墙薄弱部位; 然后,据此进行局部袖阀管注浆防渗漏处理; 最后,复测检验注浆效果,基坑渗漏水量得到有效控制。该技术能够为深基坑地下连续墙的渗流流速检测预警、渗漏风险控制管理、渗水事故应急处置提供完整可行的解决方案。

In order to effectively solve the seepage of diaphragm wall in deep foundation pit engineering, the sonar seepage detection is applied in Jinhu Square Station of Nanning Metro Line 3. Firstly, sonar seepage detection is carried out on 65 waterproof curtains, and the data of seepage velocity, flow direction, seepage quantity and permeability coefficient are obtained. The three-dimensional visualized flow field is inverted and the weak parts of diaphragm wall are accurately located. Then, the grouting anti-seepage treatment is carried out accordingly. Finally, the grouting effect is checked by re-testing, and the seepage quantity of foundation pit is effectively reduced. It provides a complete and feasible solution for the detection and early warning of seepage velocity, seepage risk control management and emergency treatment of seepage accident of diaphragm wall in deep foundation pit engineering.