Fully mechanized top-coal caving: Underground stress at gateways under barrier pillars of an upper coal seamm

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Tu, Shi-Hao [1 ]
Wang, Fang-Tian [1 ]
Dou, Feng-Jin [1 ]
Yuan, Yong [1 ]
Lu, Yan [1 ]
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[1] State Key Laboratory of Coal Resource and Mine Safety, School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
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