dc.contributor.author |
Li, Xuefeng
|
|
dc.contributor.author |
Wang, Shibo
|
|
dc.contributor.author |
Malekian, Reza
|
|
dc.contributor.author |
Hao, Shangqing
|
|
dc.contributor.author |
Li, Zhixiong
|
|
dc.date.accessioned |
2016-11-02T09:24:57Z |
|
dc.date.available |
2016-11-02T09:24:57Z |
|
dc.date.issued |
2016-09 |
|
dc.description.abstract |
The cutting efficiency in underground excavations relies on the optimum parameters of the
cutting tool and the cutting process. However, the optimization of the cutting tool design and the cutting
process is a challenge and requires knowledge about the tool–rock interaction. This paper aims to investigate
the tool–rock interaction using a rock cutting mathematical model. The confining pressure was considered
in the rock cutting model with conical cutters and the discrete element method was adopted to calculate
the dynamics of the rock breakage of this model. Graded particle assemblies were created, calibrated, and
compressed in the horizontal direction with a certain confining pressure. Afterwards, the initiation and
propagation of cracks during the rock cutting processes were recorded. A series of small-scale rock cutting
tests were also carried out to verify the numerical model. The analysis results demonstrate that: 1) the
confining pressure induced larger cutting force than that in the unconfined condition; 2) with increase of
the confining pressure, the rock failure mode experienced predominantly brittle to predominantly ductile
failure; and 3) there was a critical confining pressure/compressive strength ratio of 0.53 when the transition
of failure mode occurred. |
en_ZA |
dc.description.department |
Electrical, Electronic and Computer Engineering |
en_ZA |
dc.description.librarian |
hb2016 |
en_ZA |
dc.description.sponsorship |
The National
Basic Research Program of China (2014CB046301),
the China University of Mining and Technology Research
Fund (2013ZDP05), the Key Program of
Shanxi Coal Basic (MJ2014-05) and the Science and
Technology Project of Jiangsu Province
(BK20140051), National Research Foundation (NRF),
South Africa (IFR160118156967). |
en_ZA |
dc.description.uri |
http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639 |
en_ZA |
dc.identifier.citation |
Li, X, Wang, S, Malekian, R, Hao, S & Li, Z 2016, 'Numerical simulation of rock breakage modes under confining pressures in deep mining : an experimental investigation', IEEE Access, vol. 4, pp. 5710-5720. |
en_ZA |
dc.identifier.issn |
2169-3536 (online) |
|
dc.identifier.other |
10.1109/ACCESS.2016.2608384 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/57626 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Institute of Electrical and Electronics Engineers |
en_ZA |
dc.rights |
© 2016 IEEE. Translations and content mining are permitted for academic research only. |
en_ZA |
dc.subject |
Deep mining |
en_ZA |
dc.subject |
Rock cutting process |
en_ZA |
dc.subject |
Discrete element method |
en_ZA |
dc.subject |
Confining pressure |
en_ZA |
dc.title |
Numerical simulation of rock breakage modes under confining pressures in deep mining : an experimental investigation |
en_ZA |
dc.type |
Postprint Article |
en_ZA |