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Analysis of Deep Excavation Anti-float Structure Design in Typical Wuhan Subway Stratum

Author: LingFei
Tutor: XiaYuanYou
School: Wuhan University of Technology
Course: Geotechnical Engineering
Keywords: Diaphragm Wall Deep Foundation Anti-floating FEM Finite Difference
CLC: TU753
Type: Master's thesis
Year: 2011
Downloads: 153
Quote: 0
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Abstract


In order to meet China's urban rail transit road development requirements, the national first-tier cities and some second-tier urban underground rail transit construction is accelerating, making Metro the increasing scale of deep excavation, some of the first high groundwater, groundwater rich cities such as : Wuhan, Shanghai, Nanjing and other places anti-floating Deep Station Foundation to ensure safety and reliability aspects of it is particularly prominent. The underground continuous wall supporting structure with links to the main structure of the station as a part of anti-floating station is anti-floating deep foundation structure of advanced technology is the most economical and most effective way, at this stage in the process of building the Wuhan Metro the application is also very extensive. Therefore, for such anti-floating structures deep excavation safety study has important theoretical significance and engineering application significance. In order to study this type of anti-floating design method applicability in Wuhan, Wuhan region through the hydrogeological conditions and analyzed the data, a selected sample of Wuhan terraces for the study. Relying on paper FANHU Wuhan Metro Line station excavation, to the actual project selected underground continuous wall with the main structure of the station in the course of the research object, using theoretical analysis and numerical simulation of combining research methods and ideas, to carry out a series of research work, and draws some conclusions with reference value. First, in the relevant literature collected on the basis of anti-floating deep foundation for the current measures adopted to compare the advantages and disadvantages of various anti-floating measures and their applicable, summed up the anti-floating on the theory of deep foundation formula, a comparative analysis of various theories and their underlying assumptions reasonable. Secondly, in order to better reflect the stratigraphic architecture typical of Wuhan, Wuhan comprehensive analysis of the various regions of the stratigraphic architecture, engineering, geological and hydrogeological conditions, and compared the Quaternary sediments Ⅰ, Ⅱ, Ⅲ terraces hydrogeological, and thus understand the deep excavation in Wuhan in grade Ⅰ anti-floating terraces greatest dangers in confined water, thereby selecting the second line of the Van Lake Station as project examples for analysis. Finally, select the most representative of Wuhan Metro Line Fan Lake Station as an engineering example, using the finite element software ANSYS to establish plane strain model, the main structure of the station in the absence of groundwater buoyancy and the highest numerical groundwater two extreme cases simulation analysis proved that such anti-floating design methodology security and stability. And finite difference software FLAC3D excavation pit and on the process of rising groundwater buoyancy was simulated. From the displacement, stress and stability analysis of underground continuous wall proved the main structure of the station subway station linked to ensuring the effectiveness of long-term stability.

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