Reinforcing treatment structure for tunnel middle-lower karst cave and construction method of reinforcing treatment structure

Abstract

The invention discloses a reinforcing treatment structure for a tunnel middle-lower portion karst cave and a construction method of the reinforcing treatment structure. The treatment structure comprises a tunnel; karst caves located on one side and the lower portion of the tunnel in the horizontal direction; and a rubble layer, a gravel layer, concrete, a reinforcing beam, a sprayed concrete layer, a local anchor rod and a cartridge anchor rod are arranged in the lower karst cave of the tunnel from bottom to top in sequence, wherein the reinforcing beam is connected between the concrete and an inverted arch of the tunnel, the sprayed concrete layer is connected between the horizontal karst cave and the tunnel, the local anchor rod is connected between the horizontal karst cave and a rock mass, and the cartridge anchor rod is connected between the tunnel and the rock mass. According to the reinforcing treatment structure, the lower karst cave of the tunnel is filled with the rubble layer and the gravel layer, so that the bearing of the bottom of the tunnel and the construction progress are guaranteed; through the arrangement of the reinforcing beam, the concrete filling layer below the inverted arch of the tunnel can be reinforced, and the reinforcing beam has buffering and weakening effects on asymmetric acting force; and by arranging the sprayed concrete layer, on one hand, connection between the karst cave and the tunnel is strengthened, and on the other hand, contact between the boundary of the karst cave and the rock mass is strengthened.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a reinforced disposal structure and a construction method for a karst cave in the middle and lower parts of a tunnel. Background technique [0002] In the process of tunnel construction, special geological conditions such as karst caves are often encountered. Especially in the construction of the southwest region, the styles and conditions of karst caves are more complex and changeable. Karst cave is an underground dissolution phenomenon formed by surface water and groundwater through chemical and mechanical damage to soluble rock formations. When the karst cave is on the side and below the tunnel construction layer, it is more likely to have an adverse effect on the tunnel construction, and due to the large area of ​​the karst cave, targeted treatment is required. The impact of karst on the tunnel is mainly manifested in the partial and complete suspensi...

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Problems solved by technology

[0003] The invention provides a reinforced disposal structure and construction method for the middle and lower karst caves of the tunnel, which are used to solve the technical problems of filling, reinforcement and drainage when there are horizontal and lower connected karst caves in the tunnel construction

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