Research on the Application of Freezing Reinforcement Technology in Quasi-rectangular Shield Tunnel Portal
Taking the freezing reinforcement of soil at the quasi-rectangular shield entrance and exit tunnel portal in Zhengzhou East Station of a rail transit line as the background,this paper introduces the application of freezing method in the construction of entrance and exit tunnel portal,including scheme design,difficulty arrangement,freezing construction deployment,process technology and related requirements of unfreezing.This technology solves the problems of short-distance simultaneous launching and receiving of quasi-rectangular shield,construction near the operation lines,and horizontal reinforcement of tunnel portal soil,providing reference for similar engineering.
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