Research Measures On The Control Of Uneven Settlement In The Subway Car Depot Foundation With Soft Interlayer

Car-depot is the subway metrovehicle parking,checking,servicing,using and reparing management center. This article is based on the Beijing subway huilongguan’s car depot with local sink and the uneven settlement at the beginning of operation, researching the uneven settlement. The original foundation of the huilong guan station is a fishing ground, and then it transform into the dump, and on the basis of landfill building the subway stations, so this foundation belong to the soft interlayer foundation. Whenever the vehicles parked and so on, the subway car depot foundation will happen too big settlement. The caculation of Settlement and deformation is the one of important studing subjects in soil mechanics. Since Terzaghi presented the theory of one dimension consolidation, both the theory of settlement and deformation and the estimating precision of them have made great progress. It is the semi-theoretical and semi-experienced method of the conventional caculating method of settlement and deformation. Because of the complexity in the roadbed’s settlement, there has also been a big error between the consequence based on the conventional method and the actual value. Therefore, this article will caculate and analysis the settlement and deformation of the foundation with soft interlayer in the way of numerical analysis considering vehicle load, which would promise the normal use of the upper struncture and security.In the light of the status I will take some ground treatment which is economic and useful.The mainly work of this paperare;1) Making a comparison with different treatment scheme for the weak foundation;2) the key research on construction technology which are replacement method with steel slag in combination with geogrid, the bored perfusion of steel slag and two piling foundation to strengthen the foundation;3) using the finite element analysis of the foundation’s settlement before and after processing the subway foundationt, which was analyzed and compared.The characteristics and innovation of this paper:1) Replacement method with steel slag in combination with geogrid spend construction period, and is easy to operate and economic environmental protection, especially suitable for such as Beijing, guangzhou and other population flow very big city2) innovation points is that Replacement method with steel slag in combination with geogrid is still less, belonging to the innovative solutions, and further use of steel slag also belong to a fill innovation points, can effectively use waste residue produced by large steel mill.The steel slag have advantages of gerat quality, strength.With this method we can clean up waste residue and also can reduce the use of clay, and so it is a very environmental protection means.