Numerical Simulation of Double-track Shield Tunnel Crossing Railway Subgrade Construction
Taking a practical subway project as the research object,numerical simulation was conducted on the excavation process of subway shield tunnels in soft soil areas by Midas.The deformation law of railway subgrade caused by the construction of double-track shield tunnels in soft soil areas under different burial depths and underpass angles was studied.The results indicate that the settlement of the roadbed can be divided into four stages,the first stage of right line shield construction from the beginning to below the roadbed axis,the second stage of right line shield construction from below the roadbed axis to the left line through,the third stage of right line shield construction from the beginning to below the roadbed axis,and the fourth stage of right line shield construction from below the roadbed axis to the right line through.The smaller the burial depth,the greater the roadbed settlement caused by shield tunneling construction.When the crossing angle is large,the deformation of the stratum and roadbed is mainly bending deformation.As the crossing angle decreases,the distortion deformation gradually becomes apparent,and the maximum settlement and uneven settlement of the roadbed increase significantly.
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