Research on the Influence of Double Side Drift Method Construction on Gas Pipeline Deformation in Straight-Sided Arch Tunnel
The adjacent overlying existing gas pipeline poses an extremely high risk due to the construction of subway tunnel by shallow tunneling method.Based on the underground excavation tunnel project at the entrance and exit of Hohhot Metro Line 2,the settlement law of gas pipelines caused by the double side drift method of the straight-sided arch tunnel was studied through field measurement analysis and finite element numerical simulation.The results show that the construction of a straight-sided arch tunnel using the double side drift method to cross beneath gas pipelines at close distances can meet the requirements of pipeline deformation control.The maximum settlement of the measured gas pipeline is 18.46 mm,and the maximum vault settlement of the straight-sided arch tunnel is 22.86 mm.The numerical simulation results are basically consistent with the measured results.
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