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Replacement filling treatment method for concealed argillaceous filled karst of tunnel bottom plate

A karst and floor technology, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of large amount of replacement materials, large amount of excavation and backfilling workload, etc. The effect of saving labor and material costs

Inactive Publication Date: 2017-11-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the karst overlying roof is hard and thick, it is necessary to expose the filling material by replacement and reinforcement. Ordinary excavator equipment cannot remove the overlying hard roof. The drill and blast method must be used for construction, and the excavation and backfilling workload is huge. More filling materials are used

Method used

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  • Replacement filling treatment method for concealed argillaceous filled karst of tunnel bottom plate
  • Replacement filling treatment method for concealed argillaceous filled karst of tunnel bottom plate
  • Replacement filling treatment method for concealed argillaceous filled karst of tunnel bottom plate

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 Shown is a hidden mud filling karst replacement treatment method for the tunnel floor, which mainly includes the following steps:

[0031] Step 1. Hidden karst detection

[0032] On the tunnel floor, geological radar is used to scan the floor karst by arranging survey lines in a well-shaped pattern. According to the karst development boundaries detected by each survey line, the concealed karst development plane range is marked on the floor1.

[0033] Step 2: Drill holes, install orifice pipes and water inlet and outlet pipes

[0034] ① Design the drilling positions of the water inlet hole 2 and the water outlet hole 3 within the concealed karst development plane range 1, drill each hole to the top surface of the karst filling, and install the orifice pipe 4;

[0035] ② Carry out a flushing test on the karst muddy filling 7 taken out of the bo...

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Abstract

The invention discloses a replacement filling treatment method for a concealed argillaceous filled karst of a tunnel bottom plate. The exposed rock layer of a constructed tunnel bottom plate is relatively integral, and the argillaceous filled karst which threatens the long-term stability of the bottom plate is concealed below the bottom plate. The treatment method comprises the following steps of 1, detection of the concealed karst; 2, hole drilling, and installation of orifice pipes and water inlet and outlet pipes; 3, extraction of argillaceous filler from the concealed karst; 4, injection of replacement filling materials. According to the treatment method, the replacement filling construction of the filler can be completed without excavating an overlying top plate of the concealed karst, the integrity of the overlying top plate of the karst is ensured, the workload of blasting excavation is reduced, the replacement filling materials and the construction costs are saved, and the treatment method is convenient.

Description

technical field [0001] The invention relates to a treatment method for concealed muddy filling karst in the bottom plate of a tunnel, which belongs to the tunnel construction technology. Background technique [0002] Under the action of groundwater dissolution, calcium carbonate in limestone will be transformed into slightly water-soluble calcium bicarbonate under the joint erosion of water and carbon dioxide. Under the combined action of displacement and displacement, the cavity partially collapses, and the outer muddy soil particles deposit in the dissolved cavity, and finally partially or completely fill the dissolved cavity. When the karst development location is concealed under the tunnel floor, it is very easy to cause the karst overlying roof to break and collapse under the action of traffic load and groundwater seepage in the later period. Large-scale karst may form huge potholes, and even cause major traffic accidents and casualties. [0003] "Code for Design of S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21F17/00
CPCE21D11/00E21F17/00
Inventor 张强权晓威张野徐兴宝蒋斌松
Owner CHINA UNIV OF MINING & TECH