Analysis on Influence of Shield Tunnel Undercross Multiple Railway Lines
When a subway shield tunnel crosses underneath a railway at a close distance,the strata disturbance will cause the settlement of the upper existing railway subgrade and the irregularity of the track structure,which will adversely affect the safety of railway operation.To explore the influence law of shield tunneling crossing underneath railway construction on track structure,a numerical model considering the interaction of shield tunnel-surrounding rock-subgrade was established in combination with a construction case of a shield tunnel crossing underneath the Qingdao-Jinan Railway in a subway section.The settlement of railway subgrade and the deformation characteristics of multiple tracks during shield construction were analyzed.The results show that the subgrade settlement and track deformation caused by shield construction are related to the distance between the railways.When the shield construction is directly below the railway,the subgrade settlement and track deformation are the largest,and the maximum settlement of the subgrade is 3.30mm.The maximum vertical irregularity and the maximum horizontal irregularity of the rail surface are 0.097 5mm and 3.615mm,respectively.And both the subgrade settlement and rail deformation are within the control standard range.
万方数据
维普
