The Construction Technology Research Of Tunnel Undercrossing Railway Station Yard Based On Fluid Solid Coupling

Based on undercrossing Xinxiang railway station yard tunnel as background, this paper mainly study the engineering properties of water-rich gravel formation layer and stability of tunnel. Due to the presence of the water, making the surrounding rock collapse easily and self-stabilizing ability weak. Through numerical simulation method, getting out the reasonable underpass tunnel construction methods by using finite difference software FLAC3 D. The dissertation mainly includes the following several parts:(1) Contrasting several common methods in tunnel construction under the city of their respective advantages and disadvantages. Combined with the train’s attached load to subgrade, engineering geological conditions and environmental factors. Determining a reasonable underpass tunnel construction scheme.(2) Under two conditions of fluid-solid coupling and uncoupling, contrasting the influence of tunnel stability through CRD method and box culvert jacking method. The conclusion showed that the results of fluid-solid coupling are larger than uncoupling. These two excavation methods are both meet the requirement. Selecting a proper construction scheme in actual situation.(3) Under the condition without precipitation, taking CRD method for example. By using the technique of grouting reinforcement and studying the effect of grouting curtain water shutoff and thickness of curtain grouting circle influence on ground settlement, crown settlement, water pressure of primary support. Getting out economic and reasonable parameters of grouting reinforced region.