Comprehensive construction method suitable for super-large-section shield tunneling

Abstract

The invention discloses a comprehensive construction method suitable for super-large-section shield tunneling. The comprehensive construction method comprises the following steps that a mining methodis adopted for construction to form an outer contour section tunneled by a shield tunneling machine; a fixed length serves as a joint in the section, a temporary support applied to mining method construction in the section is gradually removed, and a backfill material is synchronously applied for replacement backfill when the temporary support is removed until the space of the whole section is completely replaced and backfilled; and the shield tunneling machine is adopted for tunneling and assembling a segment structure in the backfill material subjected to replacement backfill, and a permanent functional space is formed. According to the construction method, super-large-section shield tunneling is conducted after the backfill material is used for replacement backfill, the construction difficulty and risk that the shield tunneling machine directly penetrates through a local high-strength hard rock section are reduced, the problem that backfill construction is difficult to conduct in arough hole excavated through a mining method is solved, in addition, the backfill material can provide counterforce for segment assembly, a waterproof sealing gasket is pressed, the leakage risk is reduced, and meanwhile the risk of segment staggering in the empty pushing process of the shield tunneling machine is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a comprehensive construction method suitable for excavation of super-large-section shield tunnels. Background technique [0002] For weak ground, it is more suitable for mechanical construction, that is, the shield tunneling scheme is used, which is a commonly used construction method at present. For the case where the entire tunnel is located in rock formations with good geological conditions, the traditional mining method is used for construction, that is, the method of initial support and slag extraction after blasting. [0003] With the development of infrastructure construction, there are more and more geological problems faced by tunnel construction, and the problems are becoming more and more new. The geological differences of the same tunnel are getting bigger and bigger. Some sections of the road are often soft strata and some sections are hard rocks. situati...

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Problems solved by technology

[0006] For super-large-section shield tunnels, if the small shield mine + air push scheme is also adopted, the mining method will face large excavation spans, difficulties in removing temporary supports inside the mine method, and serious segment misalignment in the air push section of the shield tunneling tunnel. , Late leakage risk and other risks

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