A kind of collapse treatment method of underground excavation tunnel

Abstract

The invention relates to a subsurface tunnel collapse treatment method. The subsurface tunnel collapse treatment method comprises the following construction steps that step A, initial support is conducted before construction; step B, a collapse hole in the top of a tunnel is sealed; step C, the interior of the collapse hole is subjected to backfill treatment; step D, the interior of the collapse hole is subjected to material-spraying filling; and step E, the interior of the collapse hole is subjected to grouting treatment. The subsurface tunnel collapse treatment method has the advantages thatsafety, reliability and the low cost are achieved, the collapsed tunnel can be treated effectively in time, and a treated collapsed area has higher stability.

Description

technical field [0001] The invention relates to the technical field of excavated tunnel construction, in particular to a method for dealing with the collapse of an excavated tunnel after a collapse occurs during the excavated tunnel and how to deal with the collapsed section and the sinking section of the vault. Background technique [0002] In tunnel construction, landslide is one of the most common geological hazards. Once a landslide occurs, it will not only cause a delay in the construction period, greatly increase the project cost, but also endanger the lives of construction and technical personnel, and cause hidden dangers in project quality, bring great difficulties to maintenance work, and even make the tunnel abnormal. use. [0003] Especially for those short tunnels with low altitude and shallow buried depth, when the new Austrian method is used to excavate, because the upper and lower steps are too long, the installation of the inverted arch frame is not timely, ...

AI Technical Summary

Problems solved by technology

Once a landslide occurs, it will not only cause a delay in the construction period, greatly increase the project cost, but also endanger the lives of construction and technical personnel, and cause hidden dangers in project quality, bring great difficulties to maintenance work, and even make the tunnel abnormal. use

[0003] Especially for those short tunnels with low altitude and shallow buried depth, when the new Austrian method is used to excavate, because the upper and lower steps are too long, the installation of the inverted arch frame is not timely, the arch ring cannot be closed as soon as possible, and the secondary lining cannot keep up. For the above reasons, when the construction is in the rainy season, a large amount of rainwater will accumulate in the mountain body, and the load-bearing of the vault will increase sharply, which may cause the tunnel to collapse. Influx into the cave, almost all the initial supporting steel frame in the collapse section collapsed, and the vaults on the front and rear sides of the collapse section sank

[0004] At present, the main methods of tunnel engineering landslide treatment include inserting board method, pipe shed method, freezing method, bolt method, open excavation method, etc., but the treatment effects are uneven, and the safety cannot be guaranteed

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