Complex weak surrounding rock type shallow-buried tunnel under unsymmetrical pressure and construction method

Abstract

The invention relates to a complex weak surrounding rock type shallow-buried tunnel under unsymmetrical pressure and a construction method. According to the scheme, the construction method comprises the following steps that a side slope is excavated in a segmented mode from top to bottom; a shaped support is arranged on a platform, and a plurality of water guide pipes are arranged on the side slope through the shaped support; a middle pilot tunnel is excavated by adopting a benching method; middle partition wall pouring construction is carried out by installing a middle partition wall form; main tunnel construction is carried out, and a middle partition wall temporary support is installed on one side, away from a main tunnel needing to be constructed, of the middle partition wall before main tunnel construction; a steel arch frame is assembled on site, and a pipe shed is installed on the steel arch; the steel arch frame and a cover arch template are mounted on the inner wall of the main tunnel on the two sides of the mid partition wall respectively; grouting operation is carried out in the pipe shed, and then concrete pouring operation is carried out; open cut tunnel excavating is carried out; and a combined supporting formwork is installed at a hole opening for internal reinforcement, and an external arch frame is installed on the outer side of the hole for external reinforcement. According to the scheme, the safety and the construction efficiency of tunnel construction can be guaranteed, the problems possibly encountered by complex geological excavation can be solved in time, and good economic and technical benefits are achieved.

Description

Technical field [0001] The present invention relates to the field of tunnel construction, and specific relates to complex soft and weak surrounding rock bias tunnels and construction methods. Background technique [0002] With the rapid development of my country's engineering construction, new Austrian construction is commonly used in the construction of the mountain tunnel. my country's mountain tunnel construction adheres to the principle of "early cavity hole, late hole", and the complexity of tunnel site selection, the tunnel hole avoids unveiled geological conditions such as shallow buried, bias, weak formation or broken crack zone. Under such geological conditions, the tunnel hole is excavated, such as reinforcement and treatment of adverse geological, or only uses the construction method of the traditional tunnel hole mouth, no corresponding construction method, which is easy to show the slope of the tunnel hole Steady, causing the guide walls at the tunnel dark and dark, ...

AI Technical Summary

Problems solved by technology

Under such geological conditions, if the excavation of the tunnel entrance is not carried out and the unfavorable geology is not reinforced and treated, or only the traditional tunnel entrance construction method is adopted, and the corresponding construction method is not adjusted, the slope failure of the tunnel entrance will easily occur. caused the guide wall at the junction of the open and dark excavation of the tunnel to overturn, and the surface of the tunnel roof to subside and crack on a large scale

The existing construction structure and construction method have the low construction efficiency of the partition wall, which cannot timely respond to the problems that may be encountered in complex site excavation, and the economic benefits are poor

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