超大直径土压平衡盾构土舱压力和开挖面水土压力分布特性研究

土压平衡盾构土舱压力的设定对于控制盾构掘进对周围环境影响意义重大。结合某超大直径隧道工程，在土舱隔板和盾构掘进断面上埋设水、土压力计，对土压平衡盾构土舱内和开挖面上的水、土压力的分布和变化情况进行研究。监测结果揭示了土压平衡盾构掘进过程中土舱压力和开挖面水、土压力分布和发展特性。结合盾构施工参数进行研究，发现土舱压力增量可以通过螺旋机转速、盾构掘进速度等施工参数计算得到。开挖面上水、土压力无法完全传递至土舱隔板，土舱压力增量约为开挖面总应力增量的76.3%。研究成果为超大直径土压平衡盾构的土舱压力设定提供了有价值的参考。

Study of distribution properties of water and earth pressure at excavation face and in chamber of earth pressure balance shield with super-large diameter

The chamber pressure control is a key operation for controlling the impact of the earth pressure balance(EPB) shield excavation on the environment.Based on the monitored data,the water and earth pressure distribution properties in chamber and at the excavation face of a super-huge diameter EPB shield tunneling are studied.According to the construction parameters analysis,it is found that the increment of chamber pressure could be calculated by the construction parameters,such as rotation speed of screw conveyor and advancement rate.In addition,the water and earth pressure at excavation face could not be transfer to the chamber completely,and the transmissibility is about 76.3%.The research results of this paper provide valuable references for the setting method of the chamber pressure of the super-huge diameter EPB shield.