高富水砂性土层中盾构掘进的渣土改良技术实践

Practice of Dregs Improvement Technology for Shield Tunneling in High Water-rich Sandy Soil Layer

针对上海轨道交通9号线南延伸松江体育中心站—醉白池站盾构区间隧道在高富水砂性土层中盾构掘进出现的喷水涌砂等问题进行了原因分析,同时提出了使用高分子聚合物改良渣土性能,较好地解决了喷水涌砂问题,为在高富水砂性土层中盾构掘进提供了宝贵的借鉴经验。

Aiming at the problems of spraying water and gushing sand appeared during the shield tunneling in the high water-rich sandy soil layer in the tunnel shield area of Songjiang Sports Center Station-Zuibaichi Station of Shanghai Metro Line 9 South Extension,the causes are analyzed.At the same time,it is proposed that the use of high-molecular polymer improved dregs can better solve the problems of spraying water and gushing sand,which can provide the valued reference and experience for the shield tunneling in the high water-rich sandy soil layer.