Construction support system and construction method of large-section tunnel in weak geological environment

Abstract

The invention discloses a flabby geological environment large section tunnel construction support and protection system and a construction method under a flabby geological environment, which can effectively solve the interference problem of sectional digging procedure of the traditional construction, and a large section tunnel can be safely and quickly constructed under an extremely flabby geological environment. The system comprises an up-left pilot tunnel primary support, an up-right pilot tunnel primary support, a down-left pilot tunnel primary support and a down-right pilot tunnel primary support which form a full ring primary support structure and are along with the stepwise digging construction of an up-left pilot tunnel, an up-right pilot tunnel, a down-left pilot tunnel and a down-right pilot tunnel, and an up-left pilot tunnel secondary lining, an up-right pilot tunnel secondary lining, a down-left pilot tunnel secondary lining and a down-right pilot tunnel secondary lining forming a full ring secondary lining structure, as well as a cross interim support system formed by an upper bulkhead vertical support, a bottom bulkhead vertical support, a left bulkhead transverse support, a right bulkhead transverse support, and the outer end of the cross interim support system is solidified with the full ring primary support structure and the full ring secondary lining structure.

Description

technical field [0001] The present invention relates to tunnels, in particular to a construction support system and construction method for large-section tunnels in soft geological environments, which are suitable for tunnel construction with large sections, soft surrounding rocks, and multi-layer structures, and are especially suitable for banded deep-weathered steep-dipping soft geological structures Tunnel construction of large cross-section tunnels under certain conditions. Background technique [0002] In the treatment project of the tunnel passing through the strip-shaped deep weathered steep-dipping weak structure, due to its steep dip, deep burial and rich water, it will cause difficult-to-control water and mud inrush disasters, which will affect the normal construction. It is generally required to achieve "fast passage" during construction In the case of a large section, the difficulty of section excavation must be decomposed to realize the excavation and support mo...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a construction support system for large-section tunnels in weak geological environments, so as to effectively solve the problem of interference in the partial excavation process of traditional construction methods, and to safely and quickly build large-section tunnels under extremely weak geological environments. tunnel

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