Study On Construction Parameters Of The Shield Tunnel Passing High-Speed Railway On Subgrade Settlement Control

The cases of the shield tunnel passing the existing railway engineering are increasing, the ground surface settlement or bulge caused by the shield propulsion, becomes the security risks of the railway.In order to explore the high-speed railway subgrade damage and interaction caused by shield tunneling construction.This thesis bases on the9th line of Guangzhou’s Metro passing the Wuguang high-speed railway as the background,through the numerical simulation,it focuses on the analysis of the subgrade deformation characteristics caused by the ground movement,and then determine the construction parameters of the shield tunnel on the subgrade settlement control. This thesis mainly carry out the following research work:Firstly,it should find out the influence factors of the ground settlement caused by the shield tunneling construction,then make the analysis of the settlement control measures in the crossing shield project,so it can provide the reasonable plan.Secondly,through the numerical simulation,study on the deformation of the ground and the subgrade on the condition of no ground reinforcement,and analysis the safety in this case. If it need to take assistant measures,through the analysis to determine reasonable assistant measures combining with the actual situation to ensure the safety of high speed railway subgrade.Finally,it uses the orthogonal experimental analysis the construction parameters,so to get the factors effect on settlement of the subgrade and the optimal combination of the parameters.And then finally obtains the optimization of the construction parameters of the shield tunnel combining with the actual situation, so as to guide the construction site.