在全断面粉砂地层中进行盾构隧道掘进施工,历来被隧道工程界视为难题。若采用网络式挤压盾构掘进,为防止涌水涌砂,需辅以气压,但气压疏干开挖面砂土后却增大了掘进阻力。若采用土压平衡盾构施工,由于砂土的塑流性差而影响进土和排土。 Shield tunneling in full-face silt strata has always been regarded as a problem by the tunnel engineering community. If the network of extrusion shield tunneling, in order to prevent gushing surge of sand, need to be supplemented by pressure, but the pressure dredging surface excavation sand has increased tunneling resistance. If the earth pressure balance shield construction, due to the poor plastic flow of sand and affect soil and soil dumping.