Space joint support structure and support method for water-rich broken strata tunnel

Abstract

The invention discloses a space joint support structure and support method for a water-rich broken strata tunnel, and relates to the technical field of tunnel construction. The problems that a large-scale deformation is prone to occur due to the fact that a water-rich broken surrounding rock section adopts a conventional spray anchoring to support surrounding rocks, the surrounding rock pressure is great, effective prevention and control of water leakage is difficult, and stability of a tunnel structure and safety of construction are jeopardized are solved. The key points of the technical scheme are that the space joint support structure comprises an initial concrete layer, a steel mesh, and steel arches arranged at intervals; longitudinal connecting steel beams distributed along the axialof a tunnel in a staggered mode are arranged between the steel arches in the circumferential direction; longitudinally connecting steel beams are connected with anchor rods; a steel fiber concrete layer covering the steel arches, the steel mesh, and the longitudinally connecting steel beam sprays the surface of the steel mesh; a waterproof and drainage structure layer paves the surface of steel fiber concrete; and a second lining concrete layer pours the surface of the waterproof and drainage structure layer. According to the space joint support structure and support method for the water-richbroken strata tunnel, deformation of the surrounding rocks in the tunnel can be effectively controlled, the waterproof and drainage functions are excellent, and stability of the tunnel structure andsafety of construction are ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, and more specifically relates to a space combined support structure and a support method for tunnels in water-rich and fractured strata. Background technique [0002] When excavating a large-section tunnel body in an unbiased water-rich stratum section, when the surrounding rock mass is weak, especially in a fully weathered stratum or a strongly weathered stratum, it is very easy to cause excessive convergence deformation in the tunnel, and even Causing landslide accidents, when the buried depth is not large, it is very easy to cause cracks on the surface of the mountain above the tunnel, and even landslides. When such topographic bias is encountered, and the geology is rich in water and the surrounding rock is broken, it is usually necessary to carry out tunnel support procedures to ensure the safety of tunnel construction. [0003] At present, in the conventional shotcrete anchor s...

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Problems solved by technology

[0004] In the prior art, when the tunnel is excavated in the water-rich broken section, due to the rich groundwater and the poor self-stabilization ability of the surrounding rock, the excavation disturbance will easily cause the surrounding rock to loosen a lot, and the arching effect is poor. In this way, the support structure will bear a large pressure of the surrounding rock, and the surrounding rock often undergoes large deformation, and it is difficult to effectively prevent the leakage of water, which endangers the stability of the tunnel structure and the safety of the operators.

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