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放顶煤开采煤矸流场三维动态特征研究

Xianqing Liu,Ruijun Wang,Yuliang Yang

Zhongzhou Coal（2017）

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Abstract
针对放顶煤开采顶煤不能全部放出或有上部矸石混入,造成顶煤损失较大、放落顶煤中矸石混合率过高等问题,通过PFC3D数值模拟软件,对单轮顺序、单轮间隔、双轮顺序3种不同放煤方式下支架上方煤矸流场动态特征进行模拟.模拟结果表明,单轮顺序放煤时,相邻组支架上方顶煤残留较多,无法放出,顶煤损失呈周期性增长;单轮间隔放煤时,则减小甚至消除了这一顶煤损失,顶煤采出率相对较大;双轮顺序放煤时,煤矸分界面下降均匀,放煤过程中混矸程度较低.
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