Collapse treatment method of tunnel in water-rich faulted zone

A treatment method and tunnel technology, which is applied in tunnels, tunnel linings, drainage, etc., can solve the problems of increasing secondary landslides and increasing water pressure, and achieve the effect of reducing construction, small excavation surface, and reducing the probability of secondary landslides

Inactive Publication Date: 2019-12-24
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for tunnel collapse in a water-rich fault zone in view of the problem that the establishment of a slurry wall will cause an increase in the water pressure in the collapse area and increase the probability of another collapse when the tunnel

Method used

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  • Collapse treatment method of tunnel in water-rich faulted zone
  • Collapse treatment method of tunnel in water-rich faulted zone
  • Collapse treatment method of tunnel in water-rich faulted zone

Examples

Experimental program
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Example Embodiment

[0052] Example 1

[0053] Such as Figure 2-7 As shown, a method for treating tunnel collapse in a water-rich fault zone includes the following steps:

[0054] S1. Pouring a grouting wall 1 close to the collapsed soil area 3, the grouting wall 1 is provided with at least one drainage pipe 11 passing through the grouting wall 1, and the grouting wall 1 passes through an anchor rod and a tunnel Connect the side walls;

[0055] S2. Drill a number of first placement holes connected to the loosening area 5 on the grouting wall 1, and place a first grouting pipe 2 in each of the first placement holes. The front end extends into the loosening area 5;

[0056] S3. Grouting into the loosening area 5 through the first grouting pipe 2, so that the grouting pressure reaches the first threshold, and the pressure is stabilized as required;

[0057] S4. Excavate the mortar wall 1 and the collapsed soil area 3, and perform vault support;

[0058] S5 Drill a number of second placement holes connected ...

Example Embodiment

[0078] Example 2

[0079] Such as Picture 9 As shown, in the method for treating the collapse of a tunnel in a water-rich fault zone as described in Example 1, in step S3, after grouting is completed, the exhaust valve 26 is closed first, and then the grouting valve 25 is closed.

[0080] Wherein, the first grouting pipe 2 is a hollow steel pipe, and the front end is pointed, the first grouting pipe 2 is provided with a grouting cavity 21 and an exhaust cavity 22, the first grouting pipe 2 At least one grouting hole 23 and at least one vent hole 24 are provided on the side wall of the front end, the grouting hole 23 is in communication with the grouting cavity 21, and the vent hole 24 is connected to the exhaust cavity 22 Connected.

[0081] The rear end of the first grouting pipe 2 is respectively connected with a grouting valve 25 and an exhaust valve 26. The grouting valve 25 is in communication with the grouting chamber 21, and the exhaust valve 26 is connected to the exhaust v...

Example Embodiment

[0083] Example 3

[0084] Such as Figure 4 with 5 As shown, as described in embodiment 1 or 2, a method for treating collapse of a tunnel in a water-rich fault zone, in step S4, a three-step seven-step method is used to treat the mortar wall 1 and the collapsed soil area 3 Carry out excavation construction.

[0085] The three-step seven-step method has a small excavation area, less difficulty in handling unexpected accidents, and can ensure construction safety to the greatest extent.

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Abstract

The invention relates to the technical field of tunnel collapse, in particular to a collapse treatment method of a tunnel in a water-rich faulted zone. The collapse treatment method of the tunnel in the water-rich faulted zone comprises the following steps that a slurry wall is poured at the position tightly attached to collapse soil body zone, and a drainage pipe is arranged on the slurry wall; afirst storing hole is drilled, and a first grouting pipe is placed; grouting is conducted on a loosen soil zone through the first grouting pipe; excavation construction is conducted, and arch crown supporting is conducted; a second storing hole is drilled, and a second grouting pipe is placed; and grouting is conducted in a collapsed cavity, and grouting is completed. By means of the collapse treatment method of the tunnel in the water-rich faulted zone, collapse is prevented from developing to the excavated tunnel in a collapse soil body zone, so that the pushing force of water burst in thecollapse soil body zone on a slurry stopping wall is reduced, geological materials are continues to be transported towards the collapse soil body zone at the upper portion of the loosen soil zone andthe collapse cavity, comprehensive management of the collapse is achieved, corresponding treatment methods for different geological objects are achieved, the probability of secondary collapsing is greatly reduced, the construction losses are reduced, and the construction safety is ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel collapse, in particular to a method for treating tunnel collapse in a water-rich fault zone. Background technique [0002] When excavating a tunnel, if the tunnel is located in a fault fracture zone that passes through strongly weathered tuff and there is underground fissure water, the groundwater will be released due to the tunnel construction passing through this place. Such a loose structure will easily form a landslide when it encounters water. [0003] Such as figure 1 As shown, after the tunnel flooded and collapsed, a collapse cavity 4 was formed above the collapse area, and the original soil and rocks in the collapse cavity 4 fell into the tunnel to form a slope-shaped landslide soil area 3, and the interior of the collapse cavity 4 was hollow, so in the collapse cavity A loose soil area 5 will be formed around 4, and the self-stability of the loose soil area 5 is almost zero, and it is ea...

Claims

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Application Information

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IPC IPC(8): E21D11/38E21F16/02E21D9/00E21D11/10
CPCE21D9/001E21D11/105E21D11/38E21F16/02
Inventor 龚彬杨洋吴静王迪陈磊罗文龙欧静
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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