Mining-induced stress changes and rock burst control in a variable-thickness coal seam

Guang an Zhu, Lin ming Dou, Zhen lei Li, Wu Cai, Yong Kong, Jing Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

In longwall mining, one of the factors most influencing safety in underground coal mining is the stress change, especially when such work is carried out within the thickness variation of a coal seam. This paper analyses the special case of a coal seam which suffers significant overstress as a result of variations in the geometry and dimension of the load itself, in particular, thinning. This is because such thickening and thinning locations of the thickness are generally areas where rock bursts occur most frequently. The results of the research were validated by measuring the stress state in the area under study. A numerical model was established using FLAC3D to understand the results of the field tests and map the zones in the model with a high risk of rock burst. The results of field tests, and the numerical modelling, show that thinning accentuates the stress concentration and energy accumulation. Furthermore, on the basis of a retrospective analysis of what was observed in a coal mine, some preventative measures were instigated as rock burst controls. Also, it was found that rock burst occurrence can be effectively reduced by the use of large-diameter drilling and break-tip blasting.

Original languageEnglish
Article number365
JournalArabian Journal of Geosciences
Volume9
Issue number5
DOIs
Publication statusPublished - 1 May 2016
Externally publishedYes

Keywords

  • Longwall mining
  • Numerical simulation
  • Rock burst
  • Stress change
  • Thinning

ASJC Scopus subject areas

  • General Environmental Science
  • General Earth and Planetary Sciences

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