Method for constructing broken surrounding rock tunnel structure

Abstract

The invention discloses a method for constructing a broken surrounding rock tunnel structure, comprising the following steps: 1) performing blasting construction; 2) performing excavation and deslagging construction by a short step method; 3) spraying concrete for reinforcement to an excavation surface, drilling a hole using an ordinary rock drill, clearing the hole, inserting a hollow grouting anchor rod into the hole, the anchor rod being an anchor rod perforated on the periphery, then connecting the tail end of the anchor rod with a grouting pump for grouting, forming a grouting reinforcement layer, and supporting the shallow surrounding rock together by the composite of a concrete reinforcement layer-the anchor rod-the grouting reinforcement layer, the deep surrounding rock being reinforced by fissure grouting; 4) carrying out flexible yielding supporting layer construction; 5) spraying a film-like waterproof layer for construction; and 6) carrying out concrete second lining construction. The composite structure of the concrete reinforcement layer-the anchor rod-the grouting reinforcement layer has high strength and can adapt to the environment of high ground stress. The flexible yielding supporting layer can solve the problem of high ground stress and structural instability under the broken surrounding rock.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a method for constructing a tunnel structure with broken surrounding rock. Background technique [0002] In recent years, with the rapid development of my country's economy, the transportation industry, which is closely related to people's lives, has also achieved unprecedented development. In order to facilitate people's travel, various road projects and railway projects need to be built underground and in mountainous areas, including the construction of various tunnels. After years of development, the construction of tunnels has changed from simple to diverse, the construction conditions have ranged from simple to complex, and the construction locations have ranged from deep to shallow. We have made great progress in construction methods, management and operation. [0003] In the process from shallow construction to deep construction, various unfavorabl...

AI Technical Summary

Problems solved by technology

Especially when encountering broken surrounding rock strata, it is difficult to ensure the stability of the structure in traditional construction. For example, the waterproof board installed in the traditional New Austrian method will be damaged due to the relative deformation of the primary support and the secondary lining, which will affect the tunnel. Waterproof performance

In addition, if the excavation surface is uneven during the initial excavation, it will affect the subsequent construction and even the strength of the entire supporting structure.

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