A method for excavating a foundation pit above an operating subway tunnel
A technology for foundation pits and tunnels, which is applied in excavation, infrastructure engineering, construction, etc., can solve problems such as uneconomical, poor effect, and enlarged protective structures, so as to improve safety and reliability, avoid repeated deformation of tunnels, and reduce tunnel damage. deformation effect
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[0022] Below in conjunction with specific embodiment, further illustrate the present invention.
[0023] As shown in the figure: a method for excavating a foundation pit above an operating subway tunnel, characterized in that it includes the following steps:
[0024]Step 1, according to the size of the foundation pit, determine the contour line (2) of the foundation pit and determine the relative positional relationship between the division area of the foundation pit and the subway tunnel. This method divides the foundation pit into five areas: foundation pit I (4), Foundation Pit II (8), Foundation Pit III (14), Foundation Pit IV (16) and Foundation Pit V (17), said Foundation Pit I (4), Foundation Pit III (14) and Foundation Pit II (8) Located below the horizon (1) from left to right, there is a foundation pit IV (16) below the foundation pit I (4), a foundation pit V (17) below the foundation pit II (8), and a foundation pit III ( 14) below is the operation subway tunnel...
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