Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Coal mine hard roof directional fracturing control method

A directional fracturing, hard roof technology, applied in blasting and other directions, to achieve the effect of strong controllability, avoiding mine pressure disasters, and ensuring safe and efficient mining

Inactive Publication Date: 2019-08-02
DATONG COAL MINE GRP
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the defects and problems existing in the existing fracturing control method of the hard roof of the coal mine, and provides a directional fracturing control method of the hard roof of the coal mine

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coal mine hard roof directional fracturing control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The method for controlling directional fracturing of a hard roof in a coal mine is realized by the following steps:

[0015] a. Select the uncollapsed roof 7 of the roadway 6 as the area for directional fracturing control, and use drilling rigs at intervals L Carry out drilling, the boreholes 1 are arranged in a straight line along the length direction of the roadway 6, and each borehole 1 is located in the vertical plane of the width direction of the roadway roof and forms an angle θ with the roadway roof; wherein, L is 1-3 meters (such as, Choose 1 meter, 1.5 meters, 2 meters, 2.5 meters, 3 meters), θ is 60~80° (for example, choose 60°, 65°, 70°, 75°, 80°);

[0016] The drilling distance L is related to the charge of the compound perforator. The larger the distance L is, the greater the charge of the compound perforator is. ).

[0017] b. Assemble compound perforator 2;

[0018] c. Each borehole 1 is loaded with a compound perforator 2, and then each borehole 1 is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a coal mine hard roof pressure relief method, in particular to a coal mine hard roof directional fracturing control method. The coal mine hard roof directional fracturing control method solves the problem that an existing coal mine hard roof fracturing control method cannot achieve accuracy and high efficiency. The coal mine hard roof directional fracturing control methodcomprises the following steps that a, a lateral suspension top not-caved roof of a roadway is selected as a directional fracturing control area, a drilling machine is adopted to drill holes at the interval of L, the drilled holes are linearly arranged in the length direction of the roadway, each drilled hole is located in the vertical plane in the length direction of the roadway roof and forms anangle theta with the roadway roof, wherein L is 1-3 m, and the angle theta is 60-80 degrees; b, complex perforators are assembled; c, each drilled hole is internally provided with one complex perforator, all the drilled holes are sealed, leads of the complex perforators in all the drilled holes penetrate through the hole seal to be led out of the drilled holes, the leads are connected with detonators at the outlets of the drilled holes, and all the detonators are connected with an detonation instrument; d, the detonation instrument is ignited, and operation is completed. The coal mine hard roof directional fracturing control method achieves accurate fracture generation of the coal mine hard roof.

Description

technical field [0001] The invention relates to a pressure relief method for a hard roof of a coal mine, in particular to a method for controlling directional fracturing of a hard roof of a coal mine. Background technique [0002] In underground coal mine mining, rock strata control is the core, and hard roof control is a major difficulty in rock stratum control. When there is a hard roof on the coal seam, because of its high strength, the roof is difficult to break, resulting in a large step distance of the suspended roof, and its fracture structure is uncontrollable, which induces complex stress distribution in the coal mine stope and serious mine pressure disasters. At present, for the control of hard roof, blasting or hydraulic fracturing are mostly used, among which blasting technology has a large damage range and high safety hazards; when hydraulic fracturing technology controls hard roof, the expansion of fracturing cracks is directly affected by the three-dimensional...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 于斌高瑞匡铁军李钊孙宪宏
Owner DATONG COAL MINE GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com