Study on the Working Resistance of a Support under Shallowly Buried Gobs According to the Roof Structure during Periodic Weighting

Chen Wang, Cheng Zhu, Yong Yuan, Zhongshun Chen and Wenmiao Wang
Additional contact information
Chen Wang: School of Mines, Guizhou University, Guiyang 550025, China
Cheng Zhu: School of Mines, Guizhou University, Guiyang 550025, China
Yong Yuan: Key Laboratory of Deep Coal Resources Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China
Zhongshun Chen: Key Laboratory of Deep Coal Resources Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China
Wenmiao Wang: Key Laboratory of Deep Coal Resources Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China

Sustainability, 2021, vol. 13, issue 19, 1-21

Abstract: The phenomenon of dynamic pressure in the panel under shallowly buried gobs is obvious, resulting in limited and challenging support type selection. In this paper, theoretical analysis, numerical simulation and field measurement were combined to study the reasonable working resistance of the support in panels under shallowly buried gobs. First, the definition of the equivalent main key stratum (EMKS) was proposed. Then, a method of identifying the structure of the EMKS and broken key stratum blocks was given. The roof structure of the panel under a shallowly buried gob (PSBG) during strong periodic weighting could be divided into 12 types. Mechanical models of the roof structure were established, and the method to calculate the working resistance of the support was given. The Bulianta coal mine and Fengjiata coal mine in the Yushenfu Mining Area were taken as research objects. Based on the measured working resistance curve of the support, the structural morphology of key stratum blocks during strong periodic weighting was distinguished. On this basis, the working resistance of the support was calculated. Finally, FLAC 2D numerical software was used to test the working resistance of the support. Based on the subsidence of the roof, horizontal displacement of the coal wall and the development range of the plastic zone in the surrounding rock, the working resistance of the support and adaptability of the surrounding rock control were verified and evaluated. The results show that it is reasonable to calculate the working resistance of the support based on the roof structure during strong periodic weighting. The research results can provide a reference for the scientific and rational selection of the support in a PSBG.

Keywords: shallowly buried gob; structural morphology of key stratum blocks; roof structure; strong periodic weighting; working resistance of support (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/13/19/10652/pdf (application/pdf)
https://www.mdpi.com/2071-1050/13/19/10652/ (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:jsusta:v:13:y:2021:i:19:p:10652-:d:642924

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

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