Structure Interaction Analysis And Prediction Of Water Inflow Green Floor Tunnel Flow

In the new highway and railway enineering, deep buried tunnels are often built across the area of high water level. Tunnel construction in rich groundwater area, the measure of "row-based, are generally not considered in the design of the lining of water pressure. But long-term drainage will make a lot of the original balance of groundwater destroyed, and serious environmental problems are often taken. Construction of such tunnels, the general requirements should be based on the surrounding environment of the tunnel to take in order to block the main, limited emissions ", i.e. emission controls, anti-drainage design principles, then the tunnel lining structure will be higher outside the water pressure.Tunnel under high water pressure, the surrounding rock mass stress field and seepage field changes repeatedly because of the tunnel excavation, on the one hand, groundwater seepage in the rock mass caused by the seepage body forces (hydrodynamic pressure) will change the original rock mass stress state; the other hand, the stress state of change, will impact the change of the rock mass structure, thereby changing the permeability of the rock mass. In addition, the presence of groundwater will not only weaken the physical and mechanical properties of rock, the rock strength and elastic modulus decreased, also on rock force and the hydrostatic pressure and hydrodynamic pressure, hydrostatic pressure, reduce the rock mass effective stress, makes the formation of the arch of the role and less stable, hydrodynamic pressure is generated to penetrate the body force. High external water pressure of the tunnel has become a pressing problem of the tunnel design and construction.In this paper, as Qing Ping tunne in Zhanghua highway a real case, the couple ineraction of water and stress, the groundwater forcast are studied. The main research content includes followings:(1) Summarizes the the karst area the tunnel seepage basic mode, focusing on Darcy’s law, and fluid-solid coupling analysis provides a theoretical basis for the tunnel.(2) Analysis of the stress field and seepage field interaction mechanism to explore the interaction of seepage field and stress field in the tunnel in fractured rock, and research in the the dual field coupling seepage field and stress field of surrounding rock stress distribution law contains elastoplasticarea surrounding rock stress distribution.(3) Explore the role in the penetration of water pressure in the tunnel lining and the surrounding rock and reinforcement circle distribution law, Qing Ping tunnel project as an example, calculated external water pressure acting on the lining, confirmed the setting surrounding rock reinforcement ring can reduce the role of the lining onexternal water pressure; lining pressure is calculated on the basis of considering water pressure, compared with the water pressure does not consider the case. In addition, numerical calculation tunnel lining pressure changes in the fluid-structure interaction on the basis of further analysis. (4) Numerical computing software is used to forecast inflow of young floor the tunnel V, IV rock section, and empirical formulas to calculate out the tunnel inflow compared; analysis inflow and water level, the permeability coefficient of relationship; Qing Ping tunnel the V surrounding rock, predict minimum of IV surrounding rock grouting reinforcement ring.