Journal
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
Volume 7, Issue 3, Pages 318-326Publisher
SCIENCE PRESS
DOI: 10.1016/j.jrmge.2015.03.010
Keywords
Longwall top-coal caving (LTCC); Caving shield; Three-dimensional (3D) physical model test; Deflection of drawing body; PFC3D
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Funding
- Coal Joint Funds of the National Natural Science Foundation of China [U1361209]
- National Basic Research Program of China (973 Program) [2013CB227903]
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Based on the loose medium flow field theory, the loose top-coal drawing law of longwall top-coal caving (LTCC) mining technology is studied by using self-developed three-dimensional (3D) test device. The loose top-coal drawing test with shields and the controlled test without shields are performed in the condition without any boundary effect. Test results show that shields will cause reduction in drawing volume of coal in the LTCC mining. The deflection phenomenon of drawing body is also observed in the controlled test, which is verified that the deflection of drawing body is caused by shield. It is found that the deflection angle decreases with increasing caving height, with the maximum value of alpha(tail) and the minimum value of 0. In addition, the formula to calculate the drawing volume is proposed subsequently. The deflection of drawing body is numerically simulated using particle flow code PFC3D and the proposed formula to calculate drawing volume in LTCC is also verified. (C) 2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. All rights reserved.
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