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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 water gushes and collapses in the prior art. The treatment method, through comprehensive treatment, carries out corresponding treatment methods for different geological objects, thereby greatly reducing the probability of secondary landslides, reducing construction losses, and ensuring construction safety

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

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Effect test

Embodiment 1

[0053] Such as Figure 2-7 Shown, a kind of tunnel collapse treatment method for the water-rich fault zone comprises the following steps:

[0054] S1. Pour a grout-stop wall 1 close to the landslide soil area 3, on which the grout-stop wall 1 is provided with at least one drainage pipe 11 passing through the grout-stop wall 1, and the grout-stop wall 1 passes through the anchor rod and the tunnel The side walls are connected;

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

[0056] S3. Grouting the soil loosening area 5 through the first grouting pipe 2, making the grouting pressure reach a first threshold, and stabilizing the pressure as required;

[0057] S4. Excavating the grout stop wall 1 and the landslide soil area 3, and performing arch support;

[0058] ...

Embodiment 2

[0079] Such as Figure 9 As shown, in the method for treating tunnel collapse in a water-rich fault zone as described in Example 1, in step S3, after the 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 chamber 21 and an exhaust chamber 22. The first grouting pipe 2 At least one grouting hole 23 and at least one exhaust hole 24 are provided on the front end side wall of the front end, the grouting hole 23 communicates with the grouting cavity 21, and the exhaust hole 24 communicates with 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 communicates with the grouting cavity 21, and the exhaust valve 26 communicates with the exhaust valve 26. T...

Embodiment 3

[0084] Such as Figure 4 and 5 As shown, as described in Embodiment 1 or 2, a method for treating tunnel collapses in water-rich fault zones, in step S4, the three-step seven-step method is used to treat the grout-stop wall 1 and the landslide soil area 3 Carry out excavation construction.

[0085] The three-step seven-step method has a small excavation surface and is less difficult to deal with emergencies, which 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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