“两硬”条件下孤岛型短煤柱工作面顶板破断形态及灾害防治分析

doi:10.13722/j.cnki.jrme.2015.1571

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Abstract Stress concentration in hard coal seam and complicated roof boundary condition make it，referring to dynamic failure of the surrounding rock，easy to happen in ultra short island mining face with hard roof. For improving surrounding rock controlling condition in this kind of mining face，hard roof fracturing form，surrounding rock dynamic failure mechanism and its controlling measures were studied with field observation and theoretical analysis methods. The result shows that：fracturing of the main hard roof in advancing direction belongs to class II “O-X” failure form and only triangle broken block of the main roof affects mine pressure appearance intensity which means coal seam bears high static load and low dynamic load during the periodic weighting of the mining face. Local dynamic failure of the shallow coal body is main abnormal mining pressure appearance while intensive rock burst is unlikely to happen in short island working face. Dynamic failure of the coal body may be induced by dynamic impact of the hard roof，instability of the lateral main roof structure and dramatic horizontal principal stress relief induced by quick advancing speed. Finally，comprehensive measures including “pre-hydraulic fracturing of the hard top-coal”+”increasing cutting height and decreasing advancing speed“+”improving fore-poling support carrying capacity and extending fore-poling scale”were applied in 412 ultra-short island working face and dynamic failure phenomenon of the surrounding rock is controlled effectively.

Key words： mining engineering island working face hard roof controlling measure

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	WANG Zhaohui
	CHENG Zhanbo

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WANG Zhaohui,CHENG Zhanbo. Hard roof fracturing form and dynamic disaster control in short island mining face[J]. , 2016, 35(S2): 4018-4028.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1571 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/4018

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