School;
of;
Safety;
Engineering,;
China;
University;
of;
Mining;
&;
Technology,;
Xuzhou;
221116,;
China;
Energy;
and;
Chemical;
Institute,;
China;
Pingmei;
Shenma;
Croup,;
Pingdingshan;
467000,;
China;
卸荷试验; 开采煤层; 油气流; 采煤工作面; 煤岩; 瓦斯流动规律; 支承压力; 开采过程;