Analysis on Construction Parameter Control Influence of Shield Tunneling
Metro Line 5 is in a specific area,starting from Xiuling Road Station to Mingxiu Road Station.The shield tunneling machine is used to cross the operational Metro Line 2.Its minimum vertical clearance height ranges from 2.05 m to 2.10 m.The laboratory simulation experiments are conducted to optimize and analyze the actual construction parameters.The displacement change rule of shield tunnel at the different tunneling speeds,the additional internal force change rule of shield tunnel under different thrusts,the displacement change rule of the shield under different slurry pressures and the displacement change rule of the shield tunnel at different cutterhead rotating speeds are compared and studied.By combining the monitoring data feedback from the construction site,the study shows that it is technically feasible to optimize the tunneling parameters by using the control variable method.For the underpassing of existing lines,the rational selection of the tunneling speed,jacking force,slurry pressure and cutterhead rotating speed of the shield tunneling machine is crucial in ensuring the operational safety of existing tunnels and providing more references.
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