The Treatment Method of the Karst Cave in the Upper Part of the Tunnel

Abstract

The application discloses a method for treating the upper karst cave of a tunnel, which includes the following steps: after the upper part of the tunnel face passes through the bottom of the karst cave, the inside of the karst cave is cleaned; a concrete retaining wall is poured on the side where the karst cave communicates with the ground surface; Arch protection and primary support construction; filling a concrete buffer layer outside the outer layer arch protection; depositing a sandy buffer layer on the concrete buffer layer. The method for treating the upper karst cave of the tunnel provided by the present application provides a method with high construction efficiency and low risk in the construction process under the condition that the karst cave has a large span, is connected to the surface, and there is a mud inrush disaster. The construction method and protective structure with safe and stable structure can improve the construction quality of the tunnel project, speed up the construction progress, and ensure the safety of the construction period and the stability of the operation period.

Description

technical field [0001] The present application relates to the field of road and bridge construction, in particular to a method for treating karst caves in the upper part of tunnels. Background technique [0002] Karst areas have complex geological structures, often developing fissures, faults, and caves, and are characterized by mud and water. During the excavation process of the tunnel, if there is a cavity karst cave geological body in the upper part, there will be dangers of disasters such as block collapse and mud gushing. The collapse of karst caves is due to the fact that the integrity and stability of the soluble rocks in the strata are destroyed under the action of dissolution, and the strength of the surrounding rocks is reduced. Under construction disturbances, some rock masses will separate from the parent rock or even collapse as a whole. It is determined by the degree of hydraulic connection between the cave, the surrounding medium and the surface, and is not a...

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Problems solved by technology

[0003] The traditional reinforcement and backfill treatment methods for the upper cavity of the tunnel are generally used to resist the impact load caused by the collapse of the top of the cave and avoid damage to the initial support. Blocking, diversion and other measures, if subsequent mud inrush and karst continue to develop, these existing technologies will have great safety hazards when dealing with large mud inrush caves in the upper part of the tunnel, and cannot guarantee construction safety and tunnel structure stability

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