淤泥质地层盾构始发洞门地层改良技术

Silty Stratum Reinforcement Technique Applied for Starting Hole of Shield Tunneling

钱塘江盾构始发洞门位于淤泥质黏土地层,洞门土体灵敏性高,受到扰动后易发生垮塌涌土与地面沉降,采用深层搅拌桩与高压旋喷桩相结合改良技术可防止该现象的发生。文章介绍了始发井洞门加固方法的选择、深层搅拌桩和高压旋喷桩工艺参数的确定、加固质量控制、洞口井壁混凝土的凿除、加固措施的实施效果等。

The starting hole of shield tunneling at the Qiantanjiang River is located in the silty stratum of high soil sensitivity,where hole collapse,soil gushing and ground settlement are easy to happen while soil is disturbed.The soil reinforcement technique combining deep mixing piles with high pressure jet grouting piles can prevent the starting hole from those damages.This paper presents the method selection of the starting hole reinforcement,process parameter determination of deep mixing piles and high pressure jet grouting piles,reinforcement quality control,cutting away of shaft concrete wall around the starting hole and implementation effects of the reinforcement measures.