Abstract:The node of Manlizui Road - West Huaxia Road is an important node to ensure the communication among Manlizui Road, Qiantan Avenue and the auxiliary road of West Huaxia Road, and is the transportation hub for the transformation of the three roads. The design scheme of node project leads to the present state where the thickness of covering soil on the Shangzhong Road Tunnel is decreased by 2.3 m. In order to avoid the floating capacity of the tunnel structure exceeding the requirements of the regulatory unit after direct unloading above the Shangzhong Tunnel, two common tunnel protection schemes of equal load replacement and foundation reinforcement are selected. The protection measure effect, the impact of construction on the tunnel structure, construction difficulty and cost are comprehensively considered, which considers that the cement mixing pile reinforcement protection scheme is more feasible to use as the protection scheme for the Shangzhong Tunnel at this node. At the same time, by summarizing the design experience of this project, it is hoped to provide reference for the scheme selection and design of other related similar projects.
