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Safety rapid processing technique for strong zhiji rock burst

A processing technology and technology for rock burst, which is applied in the field of safe and rapid processing technology for strong to extremely strong rock bursts, and can solve the problems of long time, closed arches, and the inability of arches to stick to surrounding rocks.

Active Publication Date: 2008-09-03
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

Anchor bolts often use ordinary mortar bolts. Not only does it take a long time to install and cannot bear the force as soon as possible. At the same time, the arch frame is often not close to the surrounding rock, and the sprayed concrete cannot completely seal the arch frame. If a small formwork is used for the secondary lining concrete, the working cycle time is longer
The traditional rockburst treatment method cannot achieve safe and fast treatment, and takes a long time. In underground engineering construction with a large amount of rockburst, it is usually difficult to guarantee the construction period target

Method used

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  • Safety rapid processing technique for strong zhiji rock burst
  • Safety rapid processing technique for strong zhiji rock burst
  • Safety rapid processing technique for strong zhiji rock burst

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Embodiment Construction

[0020] Such as figure 1 Shown is the construction process flowchart of the embodiment of the present invention.

[0021] The first step is to adopt the prediction method of rockburst or use the general geophysical prospecting method and engineering geological analysis method to analyze the geological conditions in front of the tunnel. When there is a strong to extremely strong rockburst, the following construction techniques are adopted:

[0022] In the second step, an advance release hole or an advance bolt is made in the vicinity where rock bursts are prone to occur. The hole depth of the advanced stress release hole is twice the blasting cycle footage, the hole diameter should not be less than φ48mm, the hole spacing should not be greater than 50cm, and the external inclination angle should be controlled at 5-15°; ~28mm, the hole spacing is 40~60cm, and the external inclination angle is controlled at 5~15°. At the same time, the exposed end is connected with the radial anc...

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Abstract

The invention relates to a safe and rapid process for very strong rock outburst, when a very strong rock outburst is forecast, an advancing release hole and an advancing bolt are made near the place where rock outburst happens easily, then a blast hole is drilled, a stress relief blast hole is made on the tunnel face, gunpowder is charged in the blast hole and the stress relief blast hole, then followed with the steps of connecting network, disposing spoil, cleaning top, constructor avoidance, building water swelling bolt, supporting reinforcing steel bar arch rib and netting, and doing sprayed concrete enclosed work for the wall rock. The method provided by the invention can prevent the induction of the second rock outburst or collapse, which reduces the probability of threaten to the operating persons and construction equipment when the rock outburst happens, in order to secure the construction safety; can control the forming around the tunnel, which reduces unnecessary spraying and protecting workload; the water swelling bolt not only can be installed quickly, but also has the functions of reinforcing wall rock and fixing reinforcing steel bar arch rib, the heavy layer sprayed concrete replaces the quadratic lining cement, which saves a large mount of time.

Description

technical field [0001] The invention relates to a safe and rapid treatment process for strong to extremely strong rockbursts in the field of tunnel excavation and support. Background technique [0002] There are many researches on rockburst treatment measures at home and abroad, and there are many engineering examples encountered, but so far there are still no good means and measures to achieve the purpose of safe and fast treatment, especially when strong to extremely strong rockbursts occur. Under such conditions, there is not much research on how to handle it safely and quickly to ensure construction safety and progress. When this happens, most of them are dealt with by waiting or avoiding. [0003] When a strong to extremely strong rockburst occurs, the traditional domestic methods mostly use anchors, nets, spraying and combination of steel arches or steel grids and secondary lining concrete for treatment. Anchor bolts often use ordinary mortar bolts. Not only does it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04
Inventor 杨家松侯永和汪俊杰沙宗天尹大祥崔选峰张彩楼张焰吴建福唐剑
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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