Abstract Based on the case of the Large-span Tunnel Section at Longdongbao Airport Station (Guiyang Railway Hub) crossing under the airport viaduct and the theory of punching shear failure cone of rock mass, the method for determining the minimum rock slab thickness that meets the pile foundation stress requirement was put forward by using theoretical analysis, numerical simulation and field measurement; the standard for dividing the tunnel-pile foundation proximity relationship was established, in which the surrounding rock disturbance range of tunnel excavation and the range of punching shear failure of pile foundation were considered; and the viaduct settlement control standard and design countermeasures were proposed and the measured data were used for verification. The results show that the zone of influence of the tunnel crossing under the file foundation is reasonably divided, the design countermeasures can effectively control the impact of tunnel excavation on the viaduct, and meanwhile, the impact of pile foundation on the tunnel can be controlled.
Abstract：
Based on the case of the Large-span Tunnel Section at Longdongbao Airport Station (Guiyang Railway Hub) crossing under the airport viaduct and the theory of punching shear failure cone of rock mass, the method for determining the minimum rock slab thickness that meets the pile foundation stress requirement was put forward by using theoretical analysis, numerical simulation and field measurement; the standard for dividing the tunnel-pile foundation proximity relationship was established, in which the surrounding rock disturbance range of tunnel excavation and the range of punching shear failure of pile foundation were considered; and the viaduct settlement control standard and design countermeasures were proposed and the measured data were used for verification. The results show that the zone of influence of the tunnel crossing under the file foundation is reasonably divided, the design countermeasures can effectively control the impact of tunnel excavation on the viaduct, and meanwhile, the impact of pile foundation on the tunnel can be controlled.
YANG Xiong1 MENG Qinghui2 LI Pin1 XU Dengfei3 CAO Feng1
.Design and Analysis of the Tunnel Section at Railway Station Crossing Under the Pile Foundation[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(4): 218-225
2022, Vol. 59 