Experimental Study on the Shield Tunneling-Induced Surface Settlement Considering Water-Soil Coupling

The influence of cover height,face supporting pressure and penetration rate on shield tunneling-induced ground surface settlement was studied with physical model test under the water-soil coupling condition.The mechanism of the shield tunneling-induced ground surface settlement and the transformation of water-soil pressure were analyzed,the ground settlement curves in different parameters were obtained.The influence of cover depth,face supporting pressure and penetration rate of shield tunnel to the surface settlement were discussed.A newly-modified tunneling-induced ground settlement calculation method under water-soil coupling condition was presented and applied in the case of Beijing Metro Line 10.It is revealed that the maximum surface settlement is decreasing but the transverse settlement though is widening with the argument of cover height,the surface settlement is increasing with the increment of the face supporting pressure but little influenced by the shield penetration.It indicates that it is necessary considering the influence of the shield tunneling induced boundary soil disturbance,watersoil coupled induced-soil properties weakening and the excess pore water pressure dissipating induced soil consolidation to the surface settlement.The calculation result of the newly-modified surface settlement method agrees well with insite observed data and the results of FLAC3D numerical simulations.