Ice-water accumulation body tunnel surrounding rock reinforcing and excavating method under influence of seasonal rainfall and surrounding rock support

An accumulation and seasonal technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of waste of engineering cost, lack of engineering experience, and difficulty in ensuring construction safety in water-rich seasons, so as to ensure construction progress and save costs. Effect

Inactive Publication Date: 2021-02-26
RAILWAY NO 5 BUREAU GRP FIRST ENG CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the entire section of the tunnel passing through the ice-water accumulation body is reinforced according to the risk situation in the dry season, it will be difficult to guarantee the construction safety in the water-rich season; Reinforcement design, on the one hand, will inevitably cause large-scale waste of engineering costs during the dry season, on the other hand, it will seriously drag down the construction efficiency, and it is difficult to guarantee the construction quality of surrounding rock reinforcement
Regarding the above methods of strengthening and excavating the surrounding rock of ice-water accumulation tunnels under the influence of seasonal rainfall, there is still a lack of relevant engineering experience in China, so it is urgent to solve this problem

Method used

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  • Ice-water accumulation body tunnel surrounding rock reinforcing and excavating method under influence of seasonal rainfall and surrounding rock support
  • Ice-water accumulation body tunnel surrounding rock reinforcing and excavating method under influence of seasonal rainfall and surrounding rock support
  • Ice-water accumulation body tunnel surrounding rock reinforcing and excavating method under influence of seasonal rainfall and surrounding rock support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Figure 1-7 A method for strengthening the surrounding rock of an ice-water accumulation tunnel under the influence of seasonal rainfall is shown, which includes the following steps:

[0062] S1: Build a grout stop wall 3 in front of the tunnel face;

[0063] S2; Arrange radial grouting conduits 7 on the initial support in the range behind the grouting wall 3 for grouting reinforcement;

[0064] S3: Arrange grouting holes 1 on the grouting wall, and the grouting holes 1 extend to the unexcavated section of the tunnel in front of the grouting wall 3;

[0065] S4: Grouting reinforcement through the grouting hole 1 by means of high-pressure infiltration or compaction or split grouting to form a water-stop curtain for the unexcavated section of the tunnel;

[0066] S5: Construct pipe shed holes on the outer arch of excavation contour line 4;

[0067] S6: setting up the steel pipe 11 for the pipe shed, and performing grouting for the pipe shed;

[0068] S7: Add advanced ...

Embodiment 2

[0083] The present invention also relates to a method for excavating the surrounding rock of an ice-water accumulation tunnel under the influence of seasonal rainfall, which specifically includes the following steps: after the surrounding rock is reinforced by the above-mentioned reinforcement method, temporary cross braces 12 are erected in the tunnel to break the slurry-stop wall 3, Excavation was started using the small-section three-step method.

[0084] Small sections and temporary cross braces can reduce disturbance to surrounding rock.

Embodiment 3

[0086] The present invention also shows the surrounding rock support of the ice-water accumulation tunnel under the influence of seasonal rainfall, including:

[0087] A grout-stop wall 3 located at the face of the tunnel;

[0088] A water-stop curtain that forms a closed space with the grout-stop wall 3 and is located in the unexcavated section of the tunnel;

[0089] A plurality of grouting sections extending from the grout-stop wall 3 to the water-stop curtain, the ends of the grout-fill sections form the pipe side wall and the pipe end wall of the tubular water-stop curtain, and the pipe end wall and the paddle-stop wall 3 close the tubular water-stop curtain both ends;

[0090] A plurality of radial grouting conduits 7 grouting support sections located on the primary support of the tunnel;

[0091] A plurality of pipe shed steel pipes 11 grouting support sections surrounding the outer arch of the tunnel excavation contour line 4;

[0092] Multiple advance small conduit...

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Abstract

The invention relates to an ice-water accumulation body tunnel surrounding rock reinforcing and excavating method under the influence of seasonal rainfall and a surrounding rock support. The reinforcing method comprises the following steps of S1, constructing a grout stopping wall; S2, arranging a radial grouting guide pipe on a primary support, and conducting grouting reinforcement; S3, conducting advanced drilling and curtain grouting reinforcement; S4, constructing pipe shed holes in the outer arch part of an excavated contour line; S6, arranging pipe shed steel pipes in a driving mode, andconducting pipe shed grouting; and S7, additionally arranging advanced small guide pipe grouting supports on the arch part and side walls. According to the excavating method, surrounding rock is reinforced by adopting above reinforcing method, temporary cross braces are erected in a tunnel, the grout stopping wall is broken, and excavation is carried out by adopting a small-section three-step method. The surrounding rock support comprises the grout stopping wall, a waterproof curtain, a grouting section which is a radial grouting guide pipe grouting supporting section, a pipe shed steel pipecurtain grouting supporting section, and an advanced small guide pipe grouting supporting section. In the curtain grouting process, grout can be prevented from flowing back to squeeze and crack a primary support behind a tunnel face.

Description

technical field [0001] The invention relates to a method for reinforcing the surrounding rock of an ice-water accumulation tunnel under the influence of seasonal rainfall. [0002] The invention also relates to a method for excavating surrounding rock of an ice-water accumulation body tunnel under the influence of seasonal rainfall. [0003] The invention further relates to a surrounding rock support for ice-water accumulation tunnels under the influence of seasonal rainfall. [0004] The invention further relates to a method for reinforcing the surrounding rock of an ice-water accumulation body tunnel in a dry season. Background technique [0005] More and more tunnels will inevitably be built in complex hydrogeological environments. Among them, the ice-water accumulation body is a common type of typical unfavorable geological bodies. It was mainly formed during the Quaternary interglacial period. It is composed of a large amount of loose matter transported by glacial mel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
CPCE21D9/001E21D9/00
Inventor 彭学军谢亦朋赵建斌汤宇凌涛阳军生杨曾张聪梁雄王树英方星桦刘守花刘华平
Owner RAILWAY NO 5 BUREAU GRP FIRST ENG CO LTD
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