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Pan J.,Beijing Jiaotong University | Gao H.,China Railway 18 Bureau Group Co. | Shi P.,Soochow University of China
Modern Tunnelling Technology | Year: 2015

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. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source


Li C.K.,China Railway 18 Bureau Group Co.
Applied Mechanics and Materials | Year: 2014

This paper focuses on the construction of 10 railway pilot tunnels by CRD method in Jiefang Road subway station in Changchun. To achieve the optimal construction offsets during the pilot tunnel excavation, reduce the impacts of group cavern effect, and maximize the production efficiency, the construction model of railway pilot tunnel in subway station was created by the finite difference software Flac3D. The author used the numerical simulation method to analyze the ground surface settlements and the stress variations with three different construction offsets. Then the optimal construction offset was obtained. It could provide a theoretical guidance to the construction of a similar project. © (2014) Trans Tech Publications, Switzerland. Source


Hu H.Q.,China Railway 18 Bureau Group Co.
Applied Mechanics and Materials | Year: 2014

Based on the PBA construction method of Changchun Liberation Road station metro line No.2, in order to get the optimization of construction sequence of six pilot tunnels, we use numerical simulation method and finite element software MIDAS GTS to establish the construction model of the station pilot tunnel. After comparing four excavation methods of the surface subsidence, we come to a conclusion that first up then down and first side then middle is the optimal excavation scheme. At the same time, we make models to analysis the necessity of making advance support before pilot tunnel construction. Pipe shed and small duct grouting pre support is very significant to the control of the subsidence of ground surface and vault. © (2014) Trans Tech Publications, Switzerland. Source


Gao H.,China Railway 18 Bureau Group Co. | Zhao T.,China Railway 18 Bureau Group Co. | Ma S.,China Railway 18 Bureau Group Co. | Fan X.,China Railway 18 Bureau Group Co. | Guo Y.,China Railway 18 Bureau Group Co.
Modern Tunnelling Technology | Year: 2015

Steel pipe jacking is the foundation and key technology of most large pipe-roofing construction. And yet facing with the complex formation and high groundwater pressure, sealing property of leakproof structure of jacking pipe joint is of great importance. In this paper, laboratory model experiment and ABAQUS finite element modeling are carried out regarding the sealing property of steel jacking pipe joints in the curved pipe-roof section of the Gongbei Tunnel of Hong Kong-Zhuhai-Macau Bridge. The results show that the pipe joint with two olecra-non-shaped rubber sealing rings is capable of withstanding 0.3 MPa water pressure and meeting the in-situ construction sealing requirements; the maximum contact pressure between the rubber ring and the joint socket under pressure of 0.1~1.0 MPa is greater than the applied water pressure, which means the rubber ring will be not invalidated. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source

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