Construction Deformation and Control Analysis of Underpass Provincial Highway Tunnel
In this paper,the influence of expressway tunnel excavation on provincial basement deformation is analyzed by numerical simula-tion,and the control measures for provincial basement deformation are proposed.The deformation of tunnel envelope and provincial road is mo-nitored in real time during tunnel excavation.The results show that the controlled reduction of subgrade deformation reaches 50%when the ex-cavation penetration exceeds 30 m.No matter whether there is support structure or not,tunnel excavation will affect the basement deformation of provincial highway.The slope stability control at the edge of the entrance and the tunnel excavation deformation control technology in the tun-nel are used to strengthen the tunnel excavation.The deformation value of all sections tends to be stable after construction,and does not exceed the warning value in the design scheme,that is,the deformation control technology adopted has good construction effect,and the construction quality is safe,reasonable and reliable.
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