Analysis Of The Surrounding Environment Influence Caused By Shield Construction On The Granite Residual Soil

The rapid development of tunnel and underground space in urban speeds up the progress of shield construction technology. Shield construction has the advantages of fast driving speed, relatively high safety on construction, superior quality, little impact on the surrounding environment, etc., but the stratum deformation is still inevitably caused by shield construction, in which the surface subsidence problem is particularly prominent. When the underground projects in urban area are constructed, surface subsidence should be strictly controlled in order to prevent the damage of the surface buildings and various types of underground pipeline. Consequently, to some extent, it is the key to the success of shield construction that whether control the ground movement effectively.As the tunnel construction of Shenzhen metro line5from the people-administer station to five co-station for engineering background and a combination approach of theoretical analysis, numerical simulation and situ monitoring was adopted, earth pressure balance shield tunneling process was simulated by three-dimensional nonlinear finite element software. The mechanism of soil disturbance caused by tunnel construction and manifestations of surface subsidence was analyzed. Based on soil Mohr-Coulomb elastic-plastic constitutive system, three-dimensional finite element model of shield tunnel excavation was established. The interaction of lining structure and soil was simulated using contact surface, and the deformation law of surface and ground structures was analyzed in engineering shield construction segment of Shenzhen metro line5from the people-administer station to five co-station, which providing foundations for predicting impacts of tunnel excavation on the surrounding environment in this project and providing references for similar projects.