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Study on the Transverse Force and Deformation of Large-Diameter Shield Tunnels under Complex Geological Conditions with High Water Pressure
(1 The Second Highway Survey, Design and Research Institute, China Communications, Wuhan 430056; 2 CCCC Nanjing Weisan Rd. River-Crossing Tunnel Construction Headquarters, Nanjing 211800; 3 Department of Geotechnical Engineering, Tongji University, Shanghai 200092)
Abstract In order to explore the impacts of non-uniformity of the stratigraphic distribution and high water pressure on the force borne by tunnel linings, the law of force borne by tunnel structures in the transverse direction under different geological conditions was studied using a typical section of the Weisan Road large-diameter river-crossing shield tunnel as an example. A single-ring beam/spring model, multi-ring beam/spring model and shell/spring model were adopted, respectively, and the simulation results of these three methods are analyzed and compared in this paper. The study results indicate that: 1) the bending moment of the tunnel is mainly affected by the stratum resistance based on the single-ring beam model without considering interaction between rings; 2) the erecting angle has a slight effect on internal force distribution-like the bending moment-and a strong effect on deformation in the single-ring beam/spring model, and the effect of the adjacent ring can not be ignored while a staggered joint is adopted; and 3) the deformation of the tunnel is somewhat decreased if the shear action between rings is considered, even at the segment joints.
Abstract：
In order to explore the impacts of non-uniformity of the stratigraphic distribution and high water pressure on the force borne by tunnel linings, the law of force borne by tunnel structures in the transverse direction under different geological conditions was studied using a typical section of the Weisan Road large-diameter river-crossing shield tunnel as an example. A single-ring beam/spring model, multi-ring beam/spring model and shell/spring model were adopted, respectively, and the simulation results of these three methods are analyzed and compared in this paper. The study results indicate that: 1) the bending moment of the tunnel is mainly affected by the stratum resistance based on the single-ring beam model without considering interaction between rings; 2) the erecting angle has a slight effect on internal force distribution-like the bending moment-and a strong effect on deformation in the single-ring beam/spring model, and the effect of the adjacent ring can not be ignored while a staggered joint is adopted; and 3) the deformation of the tunnel is somewhat decreased if the shear action between rings is considered, even at the segment joints.
.Study on the Transverse Force and Deformation of Large-Diameter Shield Tunnels under Complex Geological Conditions with High Water Pressure[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(4): 143-150
2015, Vol. 52 