Key;
Laboratory;
of;
Geomechanics;
and;
Deep;
Underground;
Engineering.;
School;
o/Resources;
and;
Geosciences,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou;
221008.;
China;
Design;
&;
Research;
Institute,;
Sino;
Coal;
International;
Engineering;
Group,;
Chongqing;
400016,;
China;