Study on the Fracture Law of Inclined Hard Roof and Surrounding Rock Control of Mining Roadway in Longwall Mining Face

Feng Cui, Shuai Dong, Xingping Lai, Jianqiang Chen, Chong Jia and Tinghui Zhang
Additional contact information
Feng Cui: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Shuai Dong: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Xingping Lai: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Jianqiang Chen: Shenhua Xinjiang Energy Ltd., Wulumuqi 830027, China
Chong Jia: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Tinghui Zhang: School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2020, vol. 13, issue 20, 1-22

Abstract: In the inclination direction, the fracture law of a longwall face roof is very important for roadway control. Based on the W1123 working face mining of Kuangou coal mine, the roof structure, stress and energy characteristics of W1123 were studied by using mechanical analysis, model testing and engineering practice. The results show that when the width of W1123 is less than 162 m, the roof forms a rock beam structure in the inclined direction, the floor pressure is lower, the energy and frequency of microseismic (MS) events are at a low level, and the stability of the section coal pillar is better. When the width of W1123 increases to 172 m, the roof breaks along the inclined direction, forming a double-hinged structure, the floor pressure is increased, and the frequency and energy of MS events also increases. The roof gathers elastic energy release, and combined with the MS energy release speed it can be considered that the stability of the section coal pillar is better. As the width of W1123 increases to 184 m, the roof in the inclined direction breaks again, forming a multi-hinged stress arch structure, and the floor pressure increases again. MS high-energy events occur frequently, and are not conducive to the stability of the section coal pillar. Finally, through engineering practice we verified the stability of the section coal pillar when the width of W1123 was 172 m, which provides a basis for determining the width of the working face and section coal pillar under similar conditions.

Keywords: thick and hard roof; working face width; model test; MS monitoring system; lateral abutment pressure; coal pillar stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/20/5344/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/20/5344/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:20:p:5344-:d:427758

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().