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

Method for weakening coal seam hard top plate

A technology for hard roof and coal seam, applied in the field of weakening treatment of hard and difficult-to-collapse roof of coal seam, can solve the problems of difficult natural collapse, large influence range, affecting the normal and safe production of the mining area, etc. Effect

Inactive Publication Date: 2017-11-24
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
View PDF7 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that in the actual mining process, the hard roof is overhanging in a large area and it is difficult to collapse natural

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
  • Method for weakening coal seam hard top plate
  • Method for weakening coal seam hard top plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] A method for weakening the hard roof of a coal seam, the specific steps are as follows,

[0028] 1) Drilling settings:

[0029] The hydraulic fracturing drilling is arranged within 200m of the cutting hole, the drilling spacing is 100-200m, and the drilling arrangement is selected on the side closer to the return airway.

[0030] 2) Ground drilling:

[0031] (1) The first hole of drilling is drilled with a Ф311mm drill bit, drilled below...

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 belongs to the technical field of weakening treatment of hard and difficult roofs of coal seams, in particular to a method for weakening hard roofs of coal seams. Solve the problem that in the actual mining process, the hard roof is overhanging in a large area and it is difficult to collapse naturally. After the collapse, it mostly collapses in a large area and has a large impact range. 1) Drilling settings, 2) Ground drilling, 3) Chemical erosion, 4) hydraulic fracturing, 5) surface drainage. The invention can not only give full play to the softening effect of the chemical solution on the hard roof rock, but also give full play to the effect of hydraulic fracturing on the cutting and cracking of the rock, thereby softening the hard roof rock.

Description

technical field [0001] The invention belongs to the technical field of weakening treatment of hard and difficult roofs of coal seams, in particular to a method for weakening hard roofs of coal seams. Background technique [0002] There are a large number of hard roof coal seams in my country. This type of roof occurs directly above the coal seam or directly on the thinner roof. It has high strength, large thickness, strong integrity, and no joints and fissures. When using the knife column mining method or longwall caving mining method, the hard roof can hang a large area in the goaf without caving, and the initial pressure and periodic pressure steps are large, and the The impact of dynamic pressure can easily damage the support. In severe cases, the suspended roof area of ​​the gob can reach thousands to tens of thousands of square meters. Timely treatment of the overhanging hard roof, reducing energy accumulation and reducing the drop height of the roof are the basic meth...

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
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 张永成李兵刘亮亮刘君徐云张江华张为秦玉霞李德慧王越白杨
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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