Dahlia High Speed Water Tunnel Stability Analysis And Prevention Measures Of Drainage Ssangyong Rich

Along with our country foundation construction step speeding up increasingly, the importance of the construction of roads in the mountains to build a large number of mountain tunnel, these tunnels in place of the natural environment and geological environment is relatively complex, often need to tunnel built in high pressure water rich hilly area, so the groundwater seepage problem is very outstanding. Percolating water through the erosion to tunnel construction and operation maintenance support an adverse impact, how to prevent and deal with groundwater seepage problem has become the underground engineering a new topic. Groundwater seepage, then to groundwater for drainage and plugging exhaust treatment often compare the prevention more difficult, not only the construction process complex and need funds is high, and basic ineradicable osmosis phenomenon; On the other hand, at present on tunnel seepage theory study also still stays in the tunnel after excavation of tunnel water inflow forecast estimate of the problems such as, the rich water tunnel fluid-structure coupling theory research and stability analysis of influence factors is lack.This paper based on highway in Yun-Nan province science and technology institute of scientific research project "rich water tunnel excavation stability analysis and waterproof and drainage technology research", the research background selected from Dali highway typical middle rich water tunnel-Shuang Long tunnel. In the mastery of the tunnel surrounding rock lithology and hydrological geological material, the combination of groundwater infiltration mechanism, using numerical analysis software FLAC3D research fluid-structure coupling effect on the stability of surrounding rock tunnel, the influence of different engineering conditions and high hydraulic pressure rich water tunnel surrounding rock stability of the change rule, this paper introduces the groundwater seepage prevention measures and analyzes the reason of Shang-Long tunnel groundwater seepage were presented according to the characteristics of Shang-Long water tunnel groundwater seepage control measures, has obtained the good effect.This article mainly research content is as follows: (1)Introduced the fluid-structure coupling action principle, respectively expounds stress field on the mechanical effect of seepage field and seepage field of seepage effect of stress field, the water own mechanical action and tunnel with analysis of the groundwater in the influence of tunnel engineering,(2) Introduced the FLAC3D fluid-structure coupling module calculation principle and equation, elaborated the fluid-structure coupling calculation parameter is determined and expression way, seepage boundary conditions setting and analysis methods of optimization;(3)By using numerical simulation software FLAC3D, according to the engineering survey report provides the parameters and field monitoring data model respectively, the considering fluid-structure coupling effect and without considering fluid-structure coupling effect two cases of tunnel excavation on numerical simulation, obtained considering fluid-structure coupling and without considering fluid-structure coupling two cases of surrounding rock stress field, displacement field and plastic zone distribution situation, through the contrast analysis with the consideration of tunnel excavation under fluid-solid coupling stress and strain change rule, the results of the study is helpful to the engineering practice,(4) Analysis of the different engineering conditions:the surrounding rock type, tunnel buried depth, groundwater level change gradually on the rich water effect on the stability of the tunnel. Research got different levels in different surrounding rock buried depth, different water level under the condition of the tunnel surrounding rock after the stress field, displacement field and plastic zone and numerical simulation results and the data were analogy analysis. Contrast got under different working conditions, tunnel stability change rule, the results of the study direct guidance to the rich water tunnel waterproof and drainage, construction of the improvement and improve;(5) Introduced the groundwater seepage prevention measures and analyzes the reason of double tunnel groundwater infiltration, according to the numerical simulation results and shuang-long tunnel groundwater seepage characteristics, choice of the reasonable treatment measures, and has obtained the good effect.