Constructing method for basic pit at the upper part of shield tunnel
A technology for shield tunneling and construction methods, applied in infrastructure engineering, excavation, construction, etc., can solve the problems that cannot meet the requirements of shield tunnel structure, it is difficult to have clear guiding significance, and the quality and environmental protection requirements are high
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[0019] The foundation pit construction method of the present invention utilizes the principle of time-space effect, and proposes a complete construction method and a method for determining key parameters for the construction of the foundation pit above the shield tunnel with strict deformation requirements, so as to ensure that the foundation pit above the shield tunnel is constructed. The structural deformation of shield tunnels meets the current standards and has clear guiding significance for actual construction. The method will be described in detail below in conjunction with a specific embodiment.
[0020] The foundation pit of a new Shanghai tunnel traverses the main line of the running subway. The shield tunnel foundation pit is about 150m long and 27.1m wide. The deepest excavation depth of the foundation pit is about 12.172m. The bottom of the foundation pit is only about 4m from the top of the tunnel structure. The subway line section obliquely intersects the east-west p...
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