Self-adaptive stress tunnel primary support steel support structure and construction method thereof

Abstract

The invention discloses a self-adaptive stress tunnel primary support steel support structure and a construction method thereof, a steel support is divided into an arch-shaped part positioned at the upper part and a support part positioned at the lower part by openings positioned at side walls at two sides, and a connecting device connected between the arch-shaped part and the support part is arranged at each opening of the steel support; the connecting device elastically supports the arch-shaped part and the supporting part in the trend of the steel supporting side wall part. The steel supporting structure has the advantages of being simple in structure, good in fitting performance, capable of achieving active supporting and avoiding sudden damage and the like, and the construction method of the steel supporting structure also has the advantages.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an adaptive stress tunnel primary support steel support structure and a construction method thereof. Background technique [0002] Existing tunnels are basically faced with unfavorable geological problems such as soft rock, deformed hard rock, rock burst, etc. The construction of unfavorable tunnel sections basically controls the construction period of the entire tunnel. In order to ensure the safety of the construction period, the tunnel sections with unfavorable geology adopt the bolt-and-shot support system with the steel support as the skeleton. At present, the section steel support is generally made into the design section through mechanical cold pre-processing at home and abroad. The processed section is highly consistent with the design section, but it cannot be closely attached to the actual excavation section. This situation is caused by the relaxation and de...

AI Technical Summary

Problems solved by technology

At present, both at home and abroad, the section steel support is generally made into the design section through mechanical cold external pre-processing. The height of the processed section is consistent with the design section, but it cannot be closely attached to the actual excavation section. This situation is caused by the tunnel relaxation deformation. a major source of risk of protection breaches

[0003] The section steel is prefabricated into the designed section, and after being rigidly connected into a whole, it can only bear the force passively, and cannot actively provide support force, and once the stress concentration exceeds the limit, it will be destroyed instantaneously, and the impact will be catastrophic

In addition, the deformation amount will be reserved in the soft rock deformation tunnel section, and the existing steel support will be destroyed after passive compression deformation, which does not have the ability to bear the support, so it needs to be removed or added to fit the auxiliary arch; while the hard rock tunnel section The rigid support of the section steel support can not realize the stress release of the surrounding rock. These are the main causes of safety hazards during the construction period. On the one hand, it is not easy to detect, on the other hand, the damage is sudden, and the safety hazards during the construction period are great.

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