Simulation Analysis of Surface Settlement during the Construction of Two-Lane Shield Tunnel of Metro Line
The complex and changeable stratigraphic conditions of urban underground tunnels and the extremely sensitive urban infrastructure environment make the shield construction process of urban un-derground tunnels face great safety risks.In order to ensure the construction safety of the shield ma-chine through the intersection of land and sea deposition area and the safe operation of the shield tun-nel after construction,this paper takes the construction of the shield interval of the two-lane tunnel of Tianjin Metro Line 11 from Sanjing Road Station to Liujing Road Station as the example,and uses the MIDAS-GTS software to comparatively analyze the stratum displacement and the vertical settlement of the ground surface under different construction staggered spacing and different depths of burial.The re-sults show that when the staggered excavation length is more than 4.5 times the diameter of the tun-nel,the change of the final settlement value of the ground surface is slower,and the on-site construc-tion can be carried out outside of this range;the overall lateral settlement curve of the ground surface shows a narrower and deeper pattern,so the construction should pay attention to the depth of the tun-nel shield according to the change of the settlement.
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