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3D FEM analysis on ground displacement induced by curved pipe-jacking construction


Authors: You, G.M.
Source: Geotechnical Aspects of Underground Construction in Soft Ground
Pages: 6
Date: 2008-12-09
Location: Shanghai, China

Abstract
The power tunnel of Tibet road in Shanghai is the most difficult pipe-jacking project in China with long distance and large diameter. The tunnel crosses through Suzhou river, underground pipelines and area of dense buildings, especially the underground passage of subway and the existing subway line 2, so it?s vital important to protect the surrounding environment when the pipe-jacking is constructed. The deformation of ground surface and the existing tunnels during the construction of curved pipe-jacking is studied with 3D finite element methods. First, the calculated results are analyzed and compared with the measured data in site to verify the correctness of the 3D FEM model. Second, there are many factors which can affect ground displacement when curved pipe-jacking is constructed. Among these factors, slurry sleeves? qualities, soil pressure on the face of pipe-jacking, slurry injection pressure and earth resistance are discussed on the basis of finite element simulation. Then, the deformation of existing tunnels of subway line 2 is studied. Finally, the ground displacement formula of curved pipe-jacking is discussed.The results show that the continuity of slurry sleeves and the pressure of the face are very important factors to ground surface deformation during the construction of curved pipe-jacking. The ground displacements induced by curved pipe-jacking are not larger than those of linear pipe-jacking if the slurry sleeves around pipe are good and continual. Because of additional earth resistance, the maximum of the ground surface deformation perpendicular to pipe axis is at the side of the center of the pipe-jacking curve, and the distance of deviation depends on the radius of pipe-jacking curve.

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