Construction method for shallow-buried unsymmetrical pressure section of small-clear-distance horizontal joint shale geological tunnel

Abstract

The invention belongs to the technical field of tunnels, and particularly relates to a construction method for a shallow-buried unsymmetrical pressure section of a small-clear-distance horizontal joint shale geological tunnel. The tunnel comprises a left tunnel body and a right tunnel body which are parallel and penetrate through the same mountain body, and the construction method comprises the following steps that firstly, a plurality of pre-reinforcing piles are arranged outside the left tunnel body and the right tunnel body at intervals; secondly, a concrete retaining wall is arranged on the outer side of the tunnel with the large bias pressure in the left tunnel and the right tunnel, and a water drainage pipe is arranged on the concrete retaining wall; and thirdly, grouting system anchor pipes are arranged on the two sides of the middle rock pillar between the left tunnel and the right tunnel correspondingly, and grouting reinforcement is conducted with the grouting system anchor pipes as grouting pipes. According to the construction method, the influence of mountain bias on the left tunnel structure and the right tunnel structure can be effectively eliminated, the construction safety of the small-clear-distance tunnel can be better guaranteed, and a good construction safety space is provided for subsequent procedures; and meanwhile, the construction efficiency is improved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnels, and in particular relates to a construction method for a shallow buried biased section of a horizontal jointed shale geological tunnel with a small clear distance. Background technique [0002] In the process of split tunnel construction, the clear distances of the two tunnels are different, and the topography, landform and geology at the entrance of the tunnel are different. The existing commonly used construction methods are: controlling the blasting safety distance of the front tunnel (that is, the tunnel excavated first) and the tunnel face of the trailing hole (that is, the tunnel excavated later), and blindly increasing the tunnel support parameters; The construction of the shallow-buried eccentric pressure section of the horizontal jointed shale geological tunnel cannot effectively guarantee the influence of the eccentric pressure on the structure of the tunnel body during the tunnel const...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for the shallow-buried bias section of the horizontal jointed shale geological tunnel with small net distance, so as to solve the problem that the existing construction method cannot guarantee the tunnel The influence of bias pressure on the structure of the cave body during the construction process causes the appearance of structural cracks, increases construction costs, and reduces construction efficiency.

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