The Numerical Simulation Of Shield Tunnelling Settlement

The research on prediction and control of surface subsidence caused by shield tunnel construction is the important directions of application and research on the subject of underground engineering.In the past 30 years, based on the field measure and theoretical analysis, many scholars have done in-depth study on the changes of pore water pressure,earth pressure, and other mechanical properties caused by shield tunneling, and proposed a number of mathematical calculation models of surface subsidense. With the development of computer technology, the analysis method of numerical simulation has been adopted widely in the research of surface subsidence caused by shield tunneling.The thesis was concluded through a large number of collection work of information, which includes the on-site monitoring data of Daxing line which shield tun -nel coming through Huangcun Station, statistics of shield construction technology, handover information of technology.This paper analyzes the engineering that leads to small and reasonable surface subsidence, sums up the main parameters of shield construction, promotes the parameters of which having good control of sedimentat -ion engineering, through the method of numerical simulation analyzes the impact of the disturbance of soil as well as the impact scope, and, discussed the method to regulate the soil disturbance to a minimum. It is concluded that the change of parameters in the process of soil disturbance led to the rules of surface subsidence, then sets up the numerical simulation model based on the practical parameters.Analysis the relationship between time and depth of the Surface subsidence by the model. Simulates the Soil disturbance caused by the Shield Construction. Analysis the impact of surface subsidence of soil loading and unloading.Summary of the law of the Settlement distribution of the ground and the expansion of the settlement trough on the cross-section of the tunnel.