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Key Construction Technologies for the Ruyifang Immersed Tunnel
(1. Guangzhou Municipal Engineering Design & Research Institute Co., Ltd., Guangzhou 510060; 2. School of Civil Engineering,Guangzhou University, Guangzhou 510006; 3. China Railway Tunnel Group Co., Ltd., Guangzhou 511458)
Abstract The construction of the Ruyifang Immersed Tunnel in Guangzhou faces challenges, such as deep soft soil,dense buildings and structures, limited space for alignment layout, spatial intersection between the tunnel and subway, difficulties in retaining deep soft soil, full- ection concrete pouring of tunnel segments within a limited space,and the vibration response of the adjacent shield tunnel induced by rock excavation in the foundation trench. To solve spatial conflicts with subway space, the design concept of close-range parallel-construction and local integral co-construction was proposed. The wall anchor and lattice wall support scheme enabled vertical excavation of the adjacent dry dock. This overcame difficulties in dry dock site selection and deep soft soil support in sensitive areas.The development of a fully automated hydraulic walking combined steel formwork system for full-section element without counter-pulling within the confined space of a dry dock, as well as pouring, cooling, and insulation technologies, has significantly enhanced prefabrication efficiency and pouring quality. A double-row steel sheet pile cofferdam retaining system addressed issuses of limited working areas and insufficient bearing capacity in deep silty soil.The vibration response characteristics of adjacent shield tunnel induced by foundation trench excavation were revealed, and the environmental impact control schemes including drilling rod weight and drilling safety distance were
determined. These research results support Ruyifang Immersed Tunnel construction and provide valuable references for similar projects.
Abstract：
The construction of the Ruyifang Immersed Tunnel in Guangzhou faces challenges, such as deep soft soil,dense buildings and structures, limited space for alignment layout, spatial intersection between the tunnel and subway, difficulties in retaining deep soft soil, full- ection concrete pouring of tunnel segments within a limited space,and the vibration response of the adjacent shield tunnel induced by rock excavation in the foundation trench. To solve spatial conflicts with subway space, the design concept of close-range parallel-construction and local integral co-construction was proposed. The wall anchor and lattice wall support scheme enabled vertical excavation of the adjacent dry dock. This overcame difficulties in dry dock site selection and deep soft soil support in sensitive areas.The development of a fully automated hydraulic walking combined steel formwork system for full-section element without counter-pulling within the confined space of a dry dock, as well as pouring, cooling, and insulation technologies, has significantly enhanced prefabrication efficiency and pouring quality. A double-row steel sheet pile cofferdam retaining system addressed issuses of limited working areas and insufficient bearing capacity in deep silty soil.The vibration response characteristics of adjacent shield tunnel induced by foundation trench excavation were revealed, and the environmental impact control schemes including drilling rod weight and drilling safety distance were
determined. These research results support Ruyifang Immersed Tunnel construction and provide valuable references for similar projects.
LIU Liying1 WEI Lixin1 YU Zhiyuan2 YANG Xudong3 YE Tingting1
.Key Construction Technologies for the Ruyifang Immersed Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(4): 259-272
2025, Vol. 62 