Three-wire parallel small spacing large section tunnel group construction method

Abstract

The invention relates to a three-wire parallel small spacing large section tunnel group construction method. The three-wire parallel small spacing large section tunnel group construction method includes the steps that advance geology forecast is conducted; tunnel entrance large pipe shed pre-reinforcement is conducted; advanced pre-reinforcement is conducted on two sides of a tunnel; blasting is controlled; preliminary supporting is conducted; secondary lining is constructed; monitoring and measurement are conducted. A new austrian tunneling method is adapted, destabilization on surrounding rocks is reduced, the strength of the surrounding rocks is not damaged, an uniform structural system is formed by the surrounding rocks and all kinds of structural supports, grouting advanced pre-reinforcement measure is conducted by using a large pipe shed, a middle pipe shed and small guide pipes, grouting reinforcement is conducted on tunnel faces and middle rock pillars, the preliminary supporting is timely, the temporary supporting is reasonable, the stability of the surrounding rocks of the tunnel is guaranteed, the construction is safe and reliable, the outline of the fracture surface is formed and structured by using elementary error smooth blasting, the lining construction is facilitated, the construction quality is guaranteed, the work amount of over-excavation and under-excavation is reduced, the construction progress is kept, the construction cost is lowered, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a three-line parallel tunnel group construction method with small spacing and large section. Background technique [0002] When the newly-built passenger dedicated line passes through the mountains, limited by the terrain and the curve of the passenger dedicated line, tunnels with small spacing and multiple holes appear many times. During the excavation and construction of small-space multi-hole tunnels, due to the deflection of the rock mass caused by blasting vibration, partial or overall instability and collapse of the rock pillars in the middle of the tunnel will be caused, which not only affects the smooth progress of the construction, but also increases the difficulty of the support construction , engineering costs increase, and even cause safety accidents. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a constr...

AI Technical Summary

Problems solved by technology

During the excavation and construction of small-space multi-hole tunnels, due to the deflection of the rock mass caused by blasting vibration, partial or overall instability and collapse of the rock pillars in the middle of the tunnel will be caused, which not only affects the smooth progress of the construction, but also increases the difficulty of the support construction , engineering costs increase, and even cause safety accidents

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