Stability of goaf-side entry driving in 800-m-deep island longwall coal face in underground coal mine

Qian, Deyu, Zhang, Nong, Shimada, Hideki, Wang, Cheng, Sasaoka, Takashi and Zhang, Nianchao (2016) Stability of goaf-side entry driving in 800-m-deep island longwall coal face in underground coal mine. Arabian Journal of Geosciences, 9 1: 1-28. doi:10.1007/s12517-015-2119-6

Author Qian, Deyu
Zhang, Nong
Shimada, Hideki
Wang, Cheng
Sasaoka, Takashi
Zhang, Nianchao
Title Stability of goaf-side entry driving in 800-m-deep island longwall coal face in underground coal mine
Journal name Arabian Journal of Geosciences   Check publisher's open access policy
ISSN 1866-7538
Publication date 2016-01-01
Sub-type Article (original research)
DOI 10.1007/s12517-015-2119-6
Open Access Status Not Open Access
Volume 9
Issue 1
Start page 1
End page 28
Total pages 28
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Abstract Goaf-side entry driving in underground coal mines could greatly improve coal recovery rates. However, it becomes more difficult to maintain stability, especially in deep coal mines. Pillar width plays a pivotal role in the stability of goaf-side entry driving. To obtain a reasonable and appropriate narrow pillar width, theoretical calculations of the widths of mining-damaged zone and limit equilibrium zone in the pillar are derived according to limit equilibrium theory. Based on the stability issues of goaf-side entry driving in the first island longwall coal face (LCF) at a depth of 800 m below the surface in Guqiao Coal Mine in China, a numerical model is established by FLAC software to analyze the stability of the surrounding rock of goaf-side entry driving during excavation, using various coal pillar widths and support schemes. The results obtained from theoretical calculations, numerical simulation, and engineering practice indicate that an 8-m-wide coal pillar is relatively reasonable, appropriate, and feasible. Field measurements show that deformations of the surrounding rock could be efficiently controlled 31 days after the support schemes were implemented in goaf-side entry driving with an 8-m-wide narrow pillar along the adjacent goaf side with a compaction duration of 10 months. The mining influence range of the overlying LCF on the stability of goaf-side entry driving is found to be the area from 50 m ahead of the LCF to 70 m behind the LCF as it passes over the measurement point.
Keyword Coal pillar
Goaf-side entry driving
Island longwall coal face
Surrounding rock
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article number 82

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
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