Construction method of half-wall and half-arch protective structure for shallow-buried eccentric tunnel through the accumulation body

Abstract

The invention discloses a construction method for a half-wall and half-arch protective structure of a shallow-buried bias tunnel through an accumulation body. The method; the construction method of the open and arched backfilling and the reverse underground excavation includes the backfilling backfill, the advance grouting support, the three-step and seven-step reserved core geotechnical method, and the monitoring and measuring method; The accumulation body is used for foot protection and back pressure, and then large pipe shed, steel mesh and backfill concrete are applied on it to form an arch effect protection; the supporting surfaces on both sides of the semi-blind and semi-concealed arch provide protection for the underground excavation. To achieve less disturbance of the accumulation body to maintain its relatively stable state; the tunnel opening protection structure provided by the invention is stable in type, simple in structure, and good in force performance. The new construction method greatly improves the safety, reliability and economy of tunnel construction, avoids large excavation, and protects the ecological environment.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering construction such as highway engineering and railway engineering, and relates to the construction of tunnels passing through unfavorable geological sections, in particular to the construction of tunnel entrance engineering in unfavorable geological sections. Construction method of half wall and half arch protective structure. Background technique [0002] The tunnel opening through the accumulation body construction has always been a technical difficulty and the focus of safety control in tunnel construction. The traditional direct cut-and-cover tunnel will inevitably cause accumulation body disturbances and cause landslides and mountain deformation. Pile pre-reinforcement grouting, auxiliary engineering construction workload is large, the project cost is high, the time period is long, and the safety risk during construction is high, which is not conducive to the control of the project....

AI Technical Summary

Problems solved by technology

[0002] The construction of the tunnel entrance through the accumulation body has always been a technical difficulty and the focus of safety control in tunnel construction. The use of traditional direct open-cutting into the hole will inevitably cause disturbance of the accumulation body and cause landslides and mountain deformation. The accumulation body needs to be cleaned in advance. Pile pre-reinforcement grouting, auxiliary engineering construction workload is large, the project cost is high and the time period is long, the safety risk is high during construction, which is not conducive to the control of the project

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