Influence of Tunnel Construction on Soil Settlement

The construction of urban subway can make better use of underground space and reduce the use of ground land resources while satisfying the convenience of life. However, during the subway construction, there will be different degrees of ground subsidence. In order to analyze the influence of shield tunneling on surface settlement, MIDAS/GTS three-dimensional finite element software is used to analyze the variation law of surface settlement under different soil properties and soil parameters. Mohr -Coulomb model is used for the establishment of soil layer and linear elastic model is used for the simulation of underground pipelines and concrete lining. According to the construction steps, the lining is applied gradually by fully considering the stress release during excavation. The variation of ground settlement when shield tunneling to different positions is deduced. The results show that the surface settlement conforms to certain changes when the tunnel is excavated to different distances.