Research On Track Settlement Control Technology Of Shield Tunnel Crossing Metro Operating Tunnel

With the large-scale development of the city,the demand for transportation capacity is higher and higher.However,due to the current saturated state of the ground traffic development,in order to make better use of urban space,the emergence of subway brings great convenience to urban traffic.With the rapid development of subway,the construction of Underpass existing operation tunnel is inevitable.Therefore,in the process of construction,the safety operation of vehicles in the upper operation tunnel needs to be fully guaranteed.Based on the shield tunnel of Suzhou Metro Line 3 project from Jin Ji Hu west station to Dongfangzhimen station,The finite difference software MIDAS / GTS is used to simulate the deformation caused by the shield construction of the underpass operation tunnel,including the numerical simulation of the underpass of the unstiffened shield,the numerical simulation of the underpass of the reinforced shield,and the influence of the different reinforcement range on the settlement control.Through the numerical simulation data analysis,the settlement rule of the underpass operation tunnel track and the stress of the tunnel are obtained Combined with the field monitoring data,this paper provides the basis for the selection of the construction parameters of the underpass operation tunnel.