Tunnel collapse disposing method and tunnel collapse support structure

Abstract

The invention discloses a tunnel collapse disposing method and a tunnel collapse support structure. The method is characterized in that an arch-on-arch structure corresponding to the shape and the range of a collapse cavity is arranged on the top of a steel arch frame of a primary support; the collapse cavity is supported through the arch-on-arch structure; and meanwhile, network concrete and anchor rods are used in an auxiliary way, so that the further enlargement of the collapse is prevented. Through the arrangement of the arch-on-arch structure on the top of the steel arch frame, the problems that the collapse cavity stress continuously changes and the collapse cavity trend is further enlarged are effectively solved; through engineering measures, the engineering requirements are met; the engineering investment is reduced; and the engineering construction period is shortened.

Description

technical field [0001] The invention relates to a treatment method for tunnel collapse and a support structure for tunnel collapse, and belongs to the technical field of hydraulic construction in water conservancy and hydropower projects. Background technique [0002] During the excavation and construction of tunnels in water conservancy and hydropower projects, the types of surrounding rocks that the tunnel traverses vary greatly. After the geologists judge the types of surrounding rocks on site, the first-stage support is carried out in time. Anchor shotcrete is partially supplemented with steel support; according to engineering experience, most of the support can meet the needs of the project after the completion of the support, but due to the release and adjustment of surrounding rock stress, the effect of groundwater, and the existence of weak belts in surrounding rock, the tunnel part is still Collapse may occur. At this time, anchor shotcrete support is generally adop...

AI Technical Summary

Problems solved by technology

[0002]During the excavation and construction of tunnels in water conservancy and hydropower projects, the types of surrounding rocks that the tunnel passes through vary greatly. , for example, the three types of surrounding rocks adopt anchor spraying measures, and the fourth types of surrounding rocks adopt anchor spraying measures partially supplemented by steel support support, etc.; , the effect of groundwater, and the existence of weak surrounding rocks, the tunnel may still partially collapse. If the geological conditions are poor, there is water gushing and weak interlayers, it is often impossible to solve the collapse of the collapse cavity again, which eventually leads to an increase in investment and a delay in the construction period.

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