Energy-absorbing yielding tunnel primary support structure system and construction method thereof

Abstract

The invention discloses an energy-absorbing yielding tunnel primary support structure system, which belongs to the technical field of tunnel primary support, and comprises a tunnel surrounding rock, an I-shaped steel A1 unit, an I-shaped steel A2 unit, an I-shaped steel A3 unit and an I-shaped steel A4 unit, which are arranged on the inner side of the tunnel surrounding rock and used for supporting the tunnel surrounding rock. According to the tunnel primary support structure system, the connecting end of the I-shaped steel has the variable characteristic, the telescopic joint in the telescopic part of the steel arch frame connector conducts telescopic adjustment along with surrounding rock deformation, energy of tunnel surrounding rock deformation is absorbed, and meanwhile light elastic materials are injected into the inner surface of the tunnel surrounding rock; in the tunnel surrounding rock deformation process, the light elastic material is firstly compressed by pressure, when the pressure continues to be increased, the steel arch connector begins to deform, the stress of the steel arch is changed, secondary buffering is conducted, the supporting structure system can adapt to large deformation of the tunnel surrounding rock, and therefore the risk that the primary support is crushed by the tunnel surrounding rock is reduced.

Description

Technical field [0001] The present invention belongs to the field of tunnel initial support technology, specifically relates to a kind of suction pressure tunnel initial support structure system and construction method thereof. Background [0002] At present, the tunnel uses composite lining, including initial support and secondary lining, of which the initial support is usually composed of steel arch frame, steel wire mesh and shotcrete, and shotcrete and steel arch frame and steel mesh form a whole, and closely adhere to the surrounding rock to form the initial support structure of the tunnel. [0003] However, the existing tunnel initial support structure system is applicable to the situation where the deformation of the surrounding rock of the tunnel is small, but for the deformation of the larger surrounding rock, it is easy to crack and deform, and eventually due to the deformation is too large, it is unstable and damaged, losing the support effect, and the buffer of the de...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of primary support structure system and construction method of pressure-absorbing and pressure-absorbing tunnels, to solve the problem that the existing tunnel primary support structure system proposed in the above-mentioned background technology has little deformation for the surrounding rock of the tunnel. Applicable, but for large surrounding rock deformation, it is easy to crack and deform, and eventually loses stability and damage due to excessive deformation, loses the support effect, and has poor cushioning for deformation pressure, which is not conducive to practical use.

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