双泵大流量振孔高压旋喷防渗墙在粉细砂坝中的应用

Application of Double-pump Large Flow Vibrating Boring and High-pressure Jet Grouting Cut-off Wall in Fine Silt Dam

振孔高喷是近几年发展的钻喷一体化、一次成墙较为先进的高喷防渗墙施工工艺,是利用高压喷射流对地层产生冲切、掺搅、升扬、置换、充填挤压、渗透固结等作用,形成所需性状的防渗固结体。本工程是首次将水力冲填粉细砂坝应用到水利枢纽大坝工程中,采用高喷防渗墙进行防渗更是初次在这样的条件中使用。大流量振孔高压旋喷施工工艺既能保证施工质量,又能提高施工工效,是高压旋喷工艺的又一次革新。

Vibrating boring and high-pressure jet grouting is an integrated technologies of drilling and grouting and advanced high-pressure jetting anti-seepage wall construction technology for one-step wall forming. Anti-seepage concretion was formed by punching shearing, mixing, lifting, replacing, packed pressing and permeable solidity with high-pressure jet flow. Fine silt dam by hydraulic filling was used in hydro-junction dam engineering for the first time, and high-pressure jetting anti-seepage wall was also for the first time used for seepage control. Large flow vibrating boring and high-pressure jet grouting is an innovation in high-pressure jet grouting technology, which can not only ensure construction quality but also increase working efficiency.