Tunnel external convex expanded head structure of mining method in stratum fracture region and construction method thereof

Abstract

The invention relates to a tunnel external convex expanded head structure of a mining method in a stratum fracture region and a construction method thereof. The tunnel external convex expanded head structure comprises a tunnel external convex expanded lining structure consisting of an expanded head external convex section and a standard section; the expanded head external convex section and the standard section are arranged at intervals, the inner wall of the expanded head external convex section is sequentially connected with the inner wall of the standard section, and the expanded head external convex section is externally provided with a reinforcing section ring convex; and an annular special deformation joint is formed in the expanded head external convex section. According to the tunnel external convex expanded head structure, expanded head arranged at the stratum fracture region is convexly treated, and at the same time, initial support of a tunnel and excavation profile are convexly at corresponding positions, so that the excavation profile and the tunnel sections can be reduced, at the same time, second lining can be cast into shape at one time, the risk of project implementation is significantly reduced, the project invest is reduced, the project quality is improved, and the blank of lining structure treatment for the tunnel in the stratum fracture region without expanding lining section at home and abroad is filled.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to an outwardly convex expanding head structure and a construction method of a mining method tunnel in a stratum fracture region. Background technique [0002] For the current rail transit projects in major cities in China, due to geological structures and human activities, there are different degrees of fault zones or broken areas in the strata, and they show certain instability and continuous deformation characteristics in the long-term process. In terms of extremely limited urban rail transit projects, it is a major controlling factor. [0003] Although the conventional expansion head built-in processing method can meet the 100-year design service life requirement of the tunnel in the stratum fracture area, it needs to expand the tunnel section, which is not conducive to engineering risk and cost control, and limits the continuous pouring construction of the lining str...

AI Technical Summary

Problems solved by technology

[0003] Although the conventional expansion head built-in processing method can meet the 100-year design service life requirement of the tunnel in the stratum fracture area, it needs to expand the tunnel section, which is not conducive to engineering risk and cost control, and limits the continuous pouring construction of the lining structure, which is not conducive to the overall quality control

With the use of mining tunnels in the Xi'an ground fissure area, the disadvantages of the conventional expansion head built-in design are becoming more and more obvious

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