School;
of;
Resources;
and;
Safety;
Engineering,;
Central;
South;
University,;
Changsha;
410083,;
China;
Hunan;
Provincial;
Key;
Laboratory;
of;
Safe;
Mining;
Techniques;
of;
Coal;
Mines,;
Hunan;
University;
of;
Science;
and;
Technology,;
Xiangtan;
411201,;
China;