Journal
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
Volume 27, Issue 6, Pages 965-972Publisher
ELSEVIER
DOI: 10.1016/j.ijmst.2017.06.020
Keywords
Dual system caving; Coal pillar; Hard rock; Broken instability; Mining pressure reveal
Categories
Funding
- National Natural Science Foundation of China [51104191, 51374258]
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT13043]
Ask authors/readers for more resources
Concerning the issue of mine pressure behaviors occurred in fully mechanized caving mining of thick coal seams beneath hard stratum in Datong Mining Area, combined with thin and thick plate theory, the paper utilizes theoretical analysis, similar experiments, numerical simulations and field tests to study the influence of remaining coal pillars in Jurassic system goaf on hard stratum fractures, as well as mine pressure behaviors under their coupling effects. The paper concludes the solution formula of initial fault displacement in hard stratum caused by remaining coal pillars. Experiments prove that coupling effects can enhance mine pressure behaviors on working faces. When inter-layer inferior key strata fractures, mine pressure phenomenon such as significant roof weighting steps and increasing resistance in support. When inter-layer superior key strata fractures, the scope of overlying strata extends to Jurassic system goaf, dual-system stopes cut through, and remaining coal pillars lose stability. As a result, the bottom inferior key strata also lose stability. It causes huge impacts on working face, and the second mine pressure behaviors. These phenomena provide evidence for research on other similar mine strata pressure behaviors occurred in dual-system mines with remaining coal pillars. (C) 2017 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available