Selection of Construction Parameters in Heading Pre-Reinforcement Working Method for Liuyang River Tunnel on Wuhan-Guangzhou High-Speed Railway
The Liuyang River Tunnel on Wuhan-Guangzhou High-Speed Railway goes through the bottom of Liuyang River, the geological condition of which wall rock is not suitable for the construction. The paper proposes the heading pre-reinforcement method, namely pre-reinforcing core soil ahead of heading with fiberglass rockbolt in construction in order to optimize the construction methods and avoid both the deformation inside the tunnel and surface subsidence, and to ensure safety of tunnel construction. In order to determine the reasonable construction parameters, the paper obtains reinforcement density and length of fiberglass rockbolt, pre-reinforcement method on outline of heading, excavation step length and other construction parameters, by the numerical simulation, the indoor model tests and other methods, and analyzes its sensitivity. It is shown by the practices in construction that the selected parameters are reasonable and significantly effective, thus providing valuable experience for promotion and application of heading pre-reinforcement method.
Qunjie Xu, Honghua Ge and Junxi Zhang
Z. M. Xiang et al., "Selection of Construction Parameters in Heading Pre-Reinforcement Working Method for Liuyang River Tunnel on Wuhan-Guangzhou High-Speed Railway", Advanced Materials Research, Vols. 361-363, pp. 1730-1739, 2012