Study on Protective Measures for Municipal Pipeline Tunnel Underpassing Baotou-Xi'an Railway
Based on the project of DN500 water pipeline underpassing Baotou-Xi'an Railway in Ordos City,this paper puts forward three kinds of reinforcement measures,namely pipe roof grouting reinforcement,subgrade grouting reinforcement and backfill grouting.Furthermore,the excavation process of earth pressure balance pipe jacking machine is simulated by finite element software,and the influence of tunnel construction on railway subgrade,railway track and catenary column is analyzed.The research shows that the main construction of culvert(pipe jacking construction)has the greatest influence on railway subgrade and railway track,and the stage deformation of this stage is the largest,which is the key stage of monitoring.The deformation of railway subgrade and railway track is not much different,and the contact network column has a certain distance from the pipe jacking point,and its deformation is very small.During the construction process,the displacements of the existing railway subgrade,the existing railway track and the catenary column are controlled within the safe range.
municipal pipeline tunnelrailway engineeringfinite element analysisrailway subgraderailway trackcatenary column
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