高寒地区大架空动水围堰高喷灌浆施工分析

Exploration of High Sprinkler Grouting Construction of Overhead Dynamic Water Cofferdam in Alpine Region

高压喷射灌浆技术被广泛运用于水利水电围堰防渗、桩基等工程。由于高喷灌浆的局限性针对砂类土、粘性土、黄土和砂土层具有较好的防渗效果,对于对粒径过大的含量过多的砾卵石以及漂石或块石、架空地层、动水现象采用高喷灌浆进行防渗施工,目前仍是一大技术难题。以水电站上下游围堰高喷灌浆施工进行分析。

High-pressure jet grouting technology is widely used in water conservancy and hydropower cofferdam seepage prevention,pile foundation and other projects.Due to the limitations of high sprinkler grouting,it has a good anti-seepage effect on sand soil,cohesive soil,loess and sand soil,and it is still a big technical problem to use high sprinkler grouting for anti-seepage construction of gravel with too large particle size and too much content,as well as boulder or block stone,overhead stratum and dynamic water phenomenon.The construction of high spray grouting on upstream and downstream cofferdam of hydropower station is analyzed.