Analysis And Treatment Of Anti-seepage Of Metro Station Under The Drainage Pipeline

Now, along with significantly enhanced of China’s economic strength and the level of urbanization continuously improved, more and more people swarm into cities, making the non-existent cities become more congested. In order to solve the traffic problems and to create a more convenient travel conditions, a large number of cities have chosen to build subway at the same time. Since most of subway stations were buried under the ground or even below the water table, the subway stations have stood a long-term impact and erosion of seepage in the surrounding rock and soil, which affects the safety and durability of the stations. How to keep seepage away from the subway stations has been a difficult problem in engineering. With the increasing number of subway stations, it is inevitable that the cross-impact between subway stations and the urban underground municipal pipelines. Once the drain line leaks, it will exert negative influence on subway station which located below the line. How to reduce or eliminate the effect is the issue to be solved in my paper.In this paper, the engineering background is that an underground municipal drain line in Changping District crosses the Nanshao subway station. Both theoretical analysis and numerical simulation methods are used for studying diffusion law of seepage caused by the leak of the underground drain pipe and its negative effect on the surrounding soil and the subway station. Then, the solutions are put forward, and the numerical analysis and research of the two kinds of methods are carried out respectively. The main contents are as follows:(1) According to the project that underground drainage pipeline crosses the subway station in Changping District, analysising on the uneven settlement of foundation, the deformation of soil and pipe is also studied and analyzed.(2) With the percolation theory, doing analysis and research on the diffusion of seepage field caused by pipeline leakage.(3) Establishing seepage analysis model, the effect of the anti seepage of the geomembrane is simulated and studied.(4) With PFC2D, establishing a particle flow numerical model to simulate the fracture grouting in clay. Under constant confining pressure and different grouting pressures condition, studying pressure variation and slurry diffusion law in soil. Through numerical simulation and theoretical analysis, the optimal injection pressure will be obtained.(5) A comparative analysis of two kinds of methods of anti seepage treatment is carried out.