粉细砂地层浅埋暗挖施工优化及控制措施

Construction optimization and control measures of shallow buried underground excavation in silty fine sand stratum

粉细砂地层的浅埋暗挖施工,一直是地铁施工的重点研究领域。由于粉细砂地层自稳性差,暗挖施工极易产生坍塌事故,因此保持开挖土体稳定、控制地面沉降成为粉细砂地层浅埋暗挖施工中最重要的课题。结合粉细砂地层浅埋暗挖工程实例,总结施工优化控制措施,为类似地层的暗挖施工提供一定参考。

The shallow-buried underground excavation construction in silty fine sand stratum has always been the key research field of subway construction.Due to the poor self-stability of the silty fine sand stratum,the construction of underground excavation is very prone to collapse accidents,so maintaining the stability of the excavated soil and controlling the ground settlement become the most important issues in the construction of shallow buried underground excavation in the silty fine sand stratum.This paper summarizes the construction optimization control measures based on the example of shallow-buried underground excavation in silty fine sand stratum,and provides some reference for the construction of underground excavation in similar stratum.