Seepage Analysis And Construction Measures Of Tunnel In High Water Pressure And Water-enriched Region

With high pressure and rich water phenomenon in the “long、large、deep” tunnel, nowhow to construct tunnel in high pressure and rich water area is a common technical problem.Especially, more and more attention is caused to protect environment, the “row based” designmethod must be replaced by the “main to block” water control project. This paper mainly study highpressure water rich section of tunnel seepage field pattern、lining against water pressure typeand construction measures.1.The relationship between grouting circle permeability coefficient, thickness andgrouting circle and lining external water pressure is studied with numerical simulation andtheoretical analysis. This provides a theoretical basis for reasonable grouting thickness,permeability coefficient and the initial support design.2. Draining funnel method is used to determine the impact of dredging range, methodof supply and drainage balance is to ensure reasonable drainage volume. These provideheoretical basis for the drainage volume.3. Numerical simulation is used to evaluate safety and economic of different section onthe condition of fluid solid coupling satisfy building boundaries. The optimum section ischosen based on the above work.4. In the premise of optimum section, field stress and displacement with and withoutseepage field is analysed.5. The pretreatment measures, excavation measures and waterproof and drainagemeasures are proposed for specific projects.