Surrounding Rock Deformation Analysis Of Mountains Separated Tunnel Under Strong Seepage Condition

With the improvement of the continuous development of transportation construction projects, highway construction gradually extends from the larger population density plains to mountainous areas and the construction of mountain tunnels increasingly highlight its importance and the entire tunnel project construction of the proportion is increasing.In the mountain tunnel construction project, the complex diversity of mountain conditions led to rock(soil) and geological conditions, structural conditions, construction projects will often dome collapse accidents or large deformation instability and other issues. A serious increase in the capital investment and construction difficult. The research focuses on reducing the mountain tunnel surrounding rock mechanics parameters of the adverse effects of tunnel construction and the corresponding construction control measures and the impact of tunnel surrounding rock mechanics internal groundwater seepage from the point of view of the strong coupling solid stream flow conditions mountain tunnel surrounding rock deformation analysis is not deep enough.In this paper, Guizhou Province Jigongshan tunnel background,strong flow conditions mountain separated tunnel rock deformation main contents and results are as follows:(1) starting from the tunnel seepage characteristics systematically investigate the effects of seepage tunnel surrounding rock stability and deformation analysis shows: rock stability and deformation affected by strong seepage mountains obvious.(2) the tunnel seepage parameters for the current situation is difficult to determine, the proposed method for calculating the parameters of surrounding rock mountains separated tunnel under strong flow conditions in line; By setting multiple sets of parameters(permeability and porosity) to simulate the the simulation results are compared with the measured data validation to get the average of the tunnel seepage parameters under strong flow conditions.(3) According to Jigongshan tunnel engineering background, the use of numerical simulation software FLAC3 D, tunnel excavation and support process flow, coupled analog computing and numerical results with field data comparison should permit the reliability of the model. And on this basis to explore the tunnel excavation of vertical displacement,horizontal displacement of the law and under the influence of fluid-structure coupling surface subsidence. The study found: tunnel excavation process, the surrounding rock deformation increases, some parts of the stress concentration and tunnel vaults and side wall cornersmaximum deformation. Groundwater seepage can cause surface subsidence on its upper structure and the surrounding environment is large to be taken seriously.(4) combined Guizhou Jigongshan tunnel construction project and analyzed under different flow conditions mountain separate parameters tunnel surrounding rock pore pressure distribution, horizontal displacement and settlement rules of the tunnel.