Settlement Control Technology for Ultra Shallow Buried and Underground Excavated Station Tunnels Crossing Urban Main Roads
The ultra shallow buried underground excavation technology has been widely applied in subway construction.Taking the underground passage of the A entrance and exit of Xingcun Station on Jinan Metro Line 4 as an example,and ABAQUS software was used to establish a three-dimensional finite element model of the underground pipeline under the ultra shallow buried underground excavation subway tunnel,and the excavation process of the underground passage was sinulated.The deformation laws of underground tunnels crossing urban main roads and surrounding surface settlement under the conditions of pre support with and without pipe shed grouting were studied,and the deformation and stress of tunnel lining were analyzed.The results show that tunnel excavation under the condition of pipe shed pre support can effectively reduce surface settlement and pipeline settlement,and the maximum surface settlement value is reduced by 60.24％and 66.8％respectively compared to not using pipe shed pre support.The settlement of the ground and pipelines in the excavation process of a rectangular cross-section cross passage is greater than that of a standard arch cross-section.The research and analysis conclusions can provide reference for similar projects.
shallow burial and hidden excavationvariable cross-sectionpipe shed supportnumerical simulation
NETL
NSTL
万方数据
