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A Study of Combined Pipe-Roof Scheme Optimization for the Bored Section of the Gongbei Tunnel
(1 School of Civil Engineering, Beijing Jiaotong University, Beijing 100044; 2 China Railway 18 Bureau Group Co. Ltd., Tianjin 300222; 3 School of Urban Rail Transit, Soochow University, Suzhou 215002)
Abstract A pipe-roof combining two kinds of steel pipes with different diameters was recommended in the preliminary design phase for the bored section of the Gongbei tunnel. During the construction design phase, and combining the construction level of the construction unit and the research results of a field pipe test, both the design option and the construction scheme of the pipe-roof were optimized in terms of a unified pipe diameter, section pattern type, launching and receiving of the jacking pipe. Considering the fluid-solid coupling interaction, these two schemes were simulated using the finite difference method. The results show that the unified pipe diameter scheme is superior to the original one in terms of lining deformation, internal force and surface subsidence, and the excavation-induced pore-water pressure drop will generate a consolidation settlement of soil, which is more significant in thawed frozen areas. Through synthetic consideration, the unified pipe diameter scheme can reduce engineering and equipment investments without decreasing the stability and structural safety of the pipe-roof, and it is most feasible in low-risk construction techniques.
Abstract：
A pipe-roof combining two kinds of steel pipes with different diameters was recommended in the preliminary design phase for the bored section of the Gongbei tunnel. During the construction design phase, and combining the construction level of the construction unit and the research results of a field pipe test, both the design option and the construction scheme of the pipe-roof were optimized in terms of a unified pipe diameter, section pattern type, launching and receiving of the jacking pipe. Considering the fluid-solid coupling interaction, these two schemes were simulated using the finite difference method. The results show that the unified pipe diameter scheme is superior to the original one in terms of lining deformation, internal force and surface subsidence, and the excavation-induced pore-water pressure drop will generate a consolidation settlement of soil, which is more significant in thawed frozen areas. Through synthetic consideration, the unified pipe diameter scheme can reduce engineering and equipment investments without decreasing the stability and structural safety of the pipe-roof, and it is most feasible in low-risk construction techniques.
PAN Jian-Li-1,
GAO Hai-Dong-2,
SHI Pei-Xin-3
.A Study of Combined Pipe-Roof Scheme Optimization for the Bored Section of the Gongbei Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 55-62
2015, Vol. 52 