An Excavation Method in the Vault Direction for Expansion of Existing Tunnel
A vault and tunnel technology, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve the problems of large disturbance, rock and soil instability, collapse, etc., and achieve the effect of reducing the disturbance
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[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.
[0043] Embodiment of the present invention: an excavation method in the direction of the vault when the existing tunnel is expanded, as shown in the attached Figure 1-17 As shown, when the positional relationship between the existing tunnel and the expanded tunnel is as attached Figure 17 As shown, when there is an intersection between the two, the vault direction of the expanded tunnel is constructed on the basis of the existing tunnel. First, the excavation surface of the roof section 14 is divided into left and right parts, namely, No. ① and No. ② area. The structural representation of the top section 14 is as attached figure 2 As shown, (a) in the figure is the structural schematic diagram of the cross-section of the existing single-hole tunnel, number 14 in the figure is the roof section, ...
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