Tunnel composite supporting structure for controlling rock creep effect and construction method thereof

Abstract

The tunnel composite supporting structure for controlling the rock creep effect comprises rock, a tunnel is formed in the rock, an inverted arch lining is poured at the bottom of the tunnel, side wall foundations are arranged on the two sides of the inverted arch lining, a compressible foam concrete layer is arranged at the upper end of the tunnel, and the compressible foam concrete layer is arranged at the lower end of the tunnel. The compressible foam concrete layer is of an arch-shaped structure, the compressible foam concrete layer is jetted to the top end in the tunnel, a plurality of drill holes are annularly formed in the compressible foam concrete layer at equal intervals, hole walls are arranged in the drill holes, the drill holes extend into rock, combined type pre-stressed anchor rods are arranged in the drill holes, and the combined type pre-stressed anchor rods are arranged in the drill holes. The combined type pre-stressed anchor rod comprises an anchor rod body. According to the tunnel composite supporting structure for controlling the rock creep effect and the construction method of the tunnel composite supporting structure, through cooperative use of the anchoring combined type pre-stressed anchor rods and the compressible foam concrete layer, long-term elastic-plastic deformation of sandstone is controlled, the creep deformation speed of the sandstone is slowed down, and the deformation resistance of surrounding rock is enhanced.

Description

technical field [0001] The invention belongs to the field of tunnel construction, in particular to a tunnel composite supporting structure for controlling rock creep effect and a construction method thereof. Background technique [0002] Highway is an important lifeline of the national economy. Due to its unique flexibility and superiority, it plays an irreplaceable role in other modes of transportation. Highway tunnels are one of the important components of highway engineering structures. With the development of our country, the western development strategy The implementation of high-grade highways has extended from the coastal areas to the southwest and northwest mountainous areas, and the construction scale of highway tunnels has become larger and larger. The original two-lane tunnel is far from being able to meet the increasing traffic requirements. Correspondingly complex, in the environment of extremely high in-situ stress and soft rock, due to the combined action of h...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing initial support structure cannot effectively spread the load, reduce the load concentration, and cause the creep of the sandstone layer to cause local damage to the support structure, thereby affecting the overall stability of the tunnel. Grouting bolts provide insufficient anchoring force, the strength of the bolt body cannot be effectively utilized, and they are distributed in isolation, not connected into a whole, and the effect of controlling rock mass deformation is poor. The proposed tunnel composite method for controlling rock creep effect Support structure and its construction method

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