Thispaper solves the problem using teclmique of big tube well, steel protecting canister, umbrella model breast wall and so on.

• 大孔经人工挖孔扩底灌注遇地下水施工难度大,本工程采用大管井降水,钢护筒,伞模护壁等工艺和技术解决了这一难题。