An advanced reinforcement construction method for tunnels with rich water and weak surrounding rock

Abstract

The invention relates to a construction method for advance reinforcement of a tunnel with rich water and weak surrounding rock, comprising the following steps: S1, excavation contour line; S2, tunnel surface sealing, first grouting reinforcement; S3, second injection Slurry reinforcement; S4, construction isolation layer and waterproof layer; S5, construction protective cement surface layer 1; S6, laying carbon fiber reinforcement layer 1; S7, erecting steel arch frame; S8, construction protection cement surface layer 2; S9, laying carbon fiber reinforcement Layer two; S10, construction protection cement surface layer three. The present invention adopts the combination of secondary grouting technology for advance reinforcement, and at the same time adopts the process of laying two layers of cement surface layer + carbon fiber after the advance reinforcement to form a second reinforcement layer, which effectively reinforces the tunnel and enhances the rigidity of the tunnel And stability, can effectively prevent tunnel disasters such as collapse, cracking and rheology, reduce construction risks, increase construction speed, and at the same time ensure the total construction period and post-operation safety of the project, with high practicability.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to an advanced reinforcement construction method for constructing a tunnel with rich water and weak surrounding rock. Background technique [0002] With the rapid development of transportation, road and bridge projects connecting the north and south of the river are also developing rapidly. Among them, there are also many tunnel projects in the mountains to shorten the distance. However, due to the different geological conditions of the mountains during tunnel construction, If the scheme adopted is unreasonable, there will be tunnel disaster phenomena such as collapse, cracking and rheology, which will affect the construction speed and construction period, and even endanger the safety of people in serious cases, causing major economic losses. [0003] Tunnel disasters such as collapse, cracking, and rheology are most prominent in saturated sand layers with poo...

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Problems solved by technology

[0002] With the rapid development of transportation, road and bridge projects connecting the north and south of the river are also developing rapidly. Among them, there are also many tunnel projects in the mountains to shorten the distance. However, due to the different geological conditions of the mountains during tunnel construction, If the scheme adopted is unreasonable, there will be tunnel disaster phenomena such as collapse, cracking and rheology, which will affect the construction speed and construction period, and even endanger life safety in serious cases, causing major economic losses

[0003] Tunnel disasters such as collapse, cracking, and rheology are most prominent in saturated sand layers with poor self-stabilization ability or severely weathered broken layers, such as the Pearl River New Town-Liede section of Guangzhou Metro Line 5 passing through water-rich sand The shallow-buried underground excavation tunnel in the deep layer, the communication channel of the Shanghai Dalian Road Cross-river Tunnel passing through the silty strata saturated with confined water, etc., the construction is difficult and the construction risk is high. The traditional single advance reinforcement method can no longer meet the current demand.

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