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

A Quantitative Solution to the Tension Replacement of Gob-side Driving in Extra-thick Coal Seam

A technology for extra-thick coal seams and solutions, which is applied in earth square drilling, special mining, surface mining, etc., can solve the problems of theoretical research and practical reports on the excavation time of gob-side roadways in extra-thick coal seams, and achieve accurate results. Effect

Active Publication Date: 2021-09-03
SHANDONG UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through a large number of literature searches, it is found that there are no theoretical research and practical reports on the excavation time of gob-side roadways in extra-thick coal seams

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
  • A Quantitative Solution to the Tension Replacement of Gob-side Driving in Extra-thick Coal Seam
  • A Quantitative Solution to the Tension Replacement of Gob-side Driving in Extra-thick Coal Seam
  • A Quantitative Solution to the Tension Replacement of Gob-side Driving in Extra-thick Coal Seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as Figure 1-3 As shown, the first step: taking the basic roof subsidence as an index, determine the excavation time T of the gob-side roadway 1

[0052] (1) On-site investigation and indoor experiment

[0053] The 201 working face of a mine in Shanxi mainly mines 2# coal seam, with an average thickness of 15m. The immediate roof is sandy mudstone with an average thickness of 6.0m, and the basic roof is siltstone with an average thickness of 9.2m. The mine adopts fully mechanized caving mining technology for coal mining, the coal mining height is 3m, the coal setting height is 12m, and the coal recovery rate is 75%.

[0054] Laboratory experiments show that the coefficient of disintegration of the coal body is 1.3, the coefficient of dilation of the direct roof is 1.2, the modulus of elasticity of the basic roof is 4.39GPa, the modulus of viscosity of the basic roof is 85.34GPa, and the compressive strength of the caving direct roof is 63MPa. The compressive str...

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 present invention relates to a quantitative solution to tension replacement of gob-side roadway in extra-thick coal seams. 1) The time T of goaf-side roadway is determined by taking the basic roof subsidence as an index. 1 ,2) Taking the stress change of the roadway surrounding rock as the time index, determine the reasonable excavation time T 2 ,3) Determine the reasonable excavation time T of the gob-side roadway. The present invention obtains the basic roof subsidence and overlying rock movement stability time on the basis of fully considering the difference between coal and rock mass, which is more in line with the actual site and the result is more accurate; the stress change of the surrounding rock of the roadway is introduced as an additional index to form a The double-index system of the excavation time of gob-side roadway; 70% of the maximum basic roof subsidence value and 80% of the maximum stress are used as the evaluation index of roadway excavation time, and the weight ratio of the two is determined according to the specific geological conditions. The excavation time of the gob-side roadway can not only ensure the safety and stability of the surrounding rock of the gob-side roadway, but also effectively reduce the time of gob-side roadway excavation in extra-thick coal seams, and ensure the normal replacement of mining.

Description

technical field [0001] The invention relates to the field of tunneling and support in coal mine roadways, in particular to a quantitative solution to tension replacement of gob-side tunneling in extra-thick coal seams. Background technique [0002] Narrow coal pillar roading along the goaf refers to the preservation of coal pillars by leaving 3-5m narrow coal pillars at the edge of the goaf under the condition that the movement of the overlying strata in the adjacent goaf terminates and the stress redistribution caused by it tends to be stable. down the laneway. At present, gob-side entry with narrow coal pillars is mainly used in thin coal seams and medium-thick coal seams. Thin coal seams refer to coal seams with a single layer thickness less than 1.3m, and medium-thick coal seams refer to those with a single layer thickness greater than 1.3m and less than 3.5m. coal seam. In the process of mining thick and extra-thick coal seams, narrow coal pillars are rarely used alon...

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 Patents(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 张广超陈连军李友翁洪周朱恒忠刘学生陶广哲江宁
Owner SHANDONG UNIV OF SCI & TECH
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