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High-stress poor rock roadway supporting process

A high-level technology for roadway support, applied in tunnels, tunnel linings, temporary shields, etc., can solve the problems of poor support effect and single way of roadway support, to ensure stability, good support effect, good economic effect

Inactive Publication Date: 2013-09-25
JCHX MINING MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of single roadway support mode and poor support effect in the prior art, the present invention provides a roadway support technology for high-level stress poor rock formations

Method used

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  • High-stress poor rock roadway supporting process
  • High-stress poor rock roadway supporting process
  • High-stress poor rock roadway supporting process

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Embodiment Construction

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0031] A roadway support technology for high-level stress unfavorable rock formations, such as figure 1 As shown, it includes the following steps:

[0032] Step a, rock drilling and blasting to excavate the roadway, the process of rock drilling and blasting to excavate the roadway should meet the following process parameters: the distance between the surrounding holes is less than 2R 2 , the peripheral eye contour retraction data should be slightly larger than R 2 value, in the range R 2 1~1.1 times of the value, among them, R 2 Represents the radius of the broken loose circle of rock mass blasting, or, the method of charging through the eye is adopted, and the amount of charge in the peripheral eye shall not ex...

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Abstract

The invention relates to a high-stress poor rock roadway supporting process, which comprises the following steps of: a, performing rock drilling and blasting to dig a roadway, and spraying plain concrete on the surfaces of all exposed roof rocks and surrounding rocks on two sides on a working surface to form a temporary supporting layer to temporarily seal the surrounding rocks; b, performing primary supporting on the roadway by adopting an anchor mesh shotcreting supporting method, and forming a first supporting layer within 12 hours after the roadway is dug; and c, 15 to 20 days after the primary supporting of the roadway, performing secondary supporting on the roadway by adopting the anchor mesh shotcreting supporting method, and forming a second supporting layer. In the high-stress poor rock roadway supporting process, relationships between stress and time are analyzed according to the stability of the surrounding rocks, and a supporting scheme combining a plurality of supporting ways is adopted for the stress releasing time period of the surrounding rocks to effectively release the high stress of the surrounding rocks, timely prevent the cracking of the surrounding rock and the expansion and loose damages of a crack, prevent the conversion of the surrounding rocks from quantitative change to qualitative change and ensure the stability of the roadway.

Description

technical field [0001] The invention relates to the technical field of geology and mining, in particular to a high-level stress-unfavorable rock layer roadway support technology, which is suitable for high-stress effects in deep mine development and mining processes, and has plastic deformation, easy weathering rock layers, broken rock mass, and rock mass Excavation and support in unfavorable rock formations such as poor stability and poor cementation. Background technique [0002] With the expansion of the mine mining range, the mining depth continues to increase, and the mining conditions are becoming more and more difficult, especially in unfavorable rock formations such as high stress, plastic deformation, easily weathered rock formations, broken rock masses, poor stability of rock masses, and poor cementation. excavation and support. After the roadway is excavated, the stress in the surrounding rock around the roadway will be readjusted. If effective protection is not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D20/02E21D19/06F42D3/04
Inventor 龚清田刘凤坤杨继胜韩高颖乔伟
Owner JCHX MINING MANAGEMENT
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