Analysis Of Force Characteristics Of The Water-rich Region Of Mountain Tunnel Lining Water Pressure And Structure For

The groundwater problems almost every problem faced by all tunnel project, and exist in the whole process of tunnel engineering design, construction and operation. In a variety of complex and poor geological conditions, the groundwater is often an important factor determining the cost of the whole tunnel project. During the construction of the tunnel project, in order to effectively solve the problem of the groundwater, determine the appropriate drainage rate, reasonable parameters of the grouting circle and the appropriate section form, has become an important issue to be solved before the tunnel project.This thesis studies systematic on the distribution of seepage field and stress field of the mountain tunnel in the water-rich region. The main contents as follows:(1) According to the method of theory and analytic, analyzing the water pressure upon the interface of rock and lining, deduced the formula of water inflow,pore water pressure and water pressure reduction factor in rock mass or lining are obtained. Based on the analytical solution, describes the variation of the tunnel water inflow and water pressure reduction coefficient outside the lining with the changes in water pressure height, lining thickness relative permeability of the lining, parameters of grouting circle and other factors.(2) According to the method of numerical simulation, simulating the seepage field of different conditions of drainage rate of the mountain tunnel in water-rich area,obtained the distribution of the water pressure outside the lining and the force of lining structure. Furthermore the use of broken-stage method for judging the carrying capacity and security of lining structures. Comparative the distribution of seepage field derived by numerical methods and experimental data, demonstrate their similarity, forming mutual authentication.(3) Simulating the various conditions of different parameters grouting circle of mountain tunnel in water-rich area, obtained the distribution of the water pressure outside the lining and the force of lining structure. Comparative with the analytical solution under the same conditions, forming mutual authentication.(4) Optimization the different cross-section forms of the tunnel by use of numerical methods, through analysising and studying the distribution of water pressure and the deformation of lining structure in case of different cross-section forms, obtained the optimal cross-section forms of mountain tunnel in high-pressure water-rich region.