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Hard roof open roadway rock burst control method based on ground fracturing

A hard roof and rockburst technology, which is applied in earthwork drilling, wellbore/well components, mining equipment, etc., can solve the problems that the control range is difficult to exceed and the control effect is difficult to ensure, and achieve the effect of avoiding rockburst

Active Publication Date: 2022-01-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two methods can control the rock burst in the empty roadway to a certain extent, they also have certain defects. For example, the active pressure relief methods such as underground hydraulic fracturing and energy-concentrating blasting are limited by technology, equipment and working space. The control range is difficult to exceed 50m above the coal seam, and passive methods such as high-strength anchor bolts and anchor cables, anti-scouring hydraulic supports do not reduce and eliminate rock burst at the source, and it is difficult to guarantee the control effect

Method used

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  • Hard roof open roadway rock burst control method based on ground fracturing
  • Hard roof open roadway rock burst control method based on ground fracturing
  • Hard roof open roadway rock burst control method based on ground fracturing

Examples

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Effect test

Embodiment 1

[0032] The embodiment of the present invention discloses a ground fracturing-based rockburst control method for a roadway with a hard roof, including:

[0033] S1: Select the vertical distance H1 less than or equal to the coal seam in the coal mine working face, and the uniaxial compressive strength and thickness respectively exceed σ c The hard roof of H2 and H2 is the fracturing target layer;

[0034] S2: At the position of the vertical distance S1 of the freeway roadway, drill a deviated well at an inclination angle α until the deviated well completely penetrates the fracturing target layer;

[0035] S3: Determine the advancing direction perpendicular to the inclined shaft and along the working face of the coal mine, and use high-energy perforating guns to perforate the two sides of the fracturing target layer in sequence;

[0036] S4, sealing and fracturing each perforation in sequence;

[0037] S5. Move the distance S2 along the advancing direction of the coal mine work...

Embodiment 2

[0047] The specific application process of the method provided by Embodiment 1 of the present invention is as follows:

[0048]The embodiment of the present invention provides a ground fracturing-based rockburst control method for a roadway with a hard roof. At a reasonable position on the side of the roadway, vertical drilling on the ground is used for hydraulic fracturing to cover the hard roof to destroy the integrity of the roof. To control the rock burst in the roadway caused by the sudden collapse of the large surface of the hard roof at the source, the specific process is as follows:

[0049] See attached Figure 1-3 As shown, taking a working face of Jinneng Holding Group as an example, the geological conditions of the working face are as follows: the thickness of the coal seam is 7m; there are 4 layers of hard rock with a thickness of more than 8m on the working face, which are the basic roof of 12m and the K3 of 20m. The corresponding uniaxial compressive strengths ...

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Abstract

The invention discloses a hard roof open roadway rock burst control method based on ground fracturing. The method comprises the steps that S1, a hard roof in a coal mine working face is selected as a fracturing target layer, wherein the vertical distance between the hard roof and a coal seam is smaller than or equal to H1, and the uniaxial compressive strength and thickness of the hard roof exceed sigma c and H2 respectively; S2, before mining of the last coal mine working face, an inclined shaft is drilled at the position, away from the vertical distance S1, of an open roadway at an inclination angle alpha till the inclined shaft penetrates through all the fracturing target layers; and S3, that the inclined shaft is perpendicular to the inclined shaft and advances in the working face is determined, and the two sides of the fracturing target layers are perforated in sequence through a high-energy perforating gun. According to the method, open roadway rock burst caused by sudden caving of the large face of the hard roof can be controlled from the source.

Description

technical field [0001] The invention relates to the technical field of coal mining, and more specifically relates to a method for controlling rock burst of a roadway with a hard roof and an empty roadway based on ground fracturing. Background technique [0002] At present, the hard roof refers to the thick, high-strength, and well-integrated rock strata overlying the coal seam, usually fine sandstone, medium-grained sandstone, etc., and hard roofs generally exist in 1 / 3 of mining areas in my country; The most common mining state is that under the mining condition of a hard-roofed roadway, the thick and hard roof on the working face suddenly breaks after a large area of ​​suspension, and the coal pillar is rotated and extruded to cause instantaneous deformation of the roadway, resulting in rock burst phenomenon. . [0003] However, at present, the control problem of rock burst in the gob roadway with hard roof is mainly divided into two aspects: active pressure relief and pass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26E21B43/11
CPCE21F7/00E21B43/26E21B43/11
Inventor 邰阳于斌刘宏杰宋金旺张文阳杨鑫春杨昆
Owner CHONGQING UNIV