超大直径盾构施工地表沉降分析

结合工程实例对超大直径泥水平衡盾构地铁隧道施工引起地表沉降的实测数据进行了分析。得出了隧道中心线上方地表在盾构推进过程中变形的一般规律及地层损失引起的地表横断面沉降的形态。用Peck公式对横向沉降槽实测数据进行拟合,得出了地表沉降槽宽度系数及地层损失率等特征参数的一般范围。对盾构推进过程中的停机情况对地表沉降的影响进行了分析,并提出了一些建议。分析成果对于城市超大直径泥水盾构工程有较好的参考价值。

Analysis of ground surface settlement induced by the super-diameter shield construction

Combining with an engineering case, this paper analyzed the measured data of ground surface settlement caused by the super-diameter slurry shield subway tunnel construction. The general rule of the ground displacement happened above the center axis of the subway tunnel during the shield advance as well as the settlement patterns of ground transverse section caused by ground layer loss were obtained. Through fitting Peck formula with the measured data of transverse settlement groove, the general ranges of the characteristic parameters such as width factor of settlement tank and ground layer loss ratio. Advices were given after analyzing the impacts of stop working during the advance of the tunneling shield on ground surface settlement . The findings in this study may provide a good reference to urban super-diameter slurry shield projects.