高强度开采工作面顶板动载冲击效应分析

doi:10.13722/j.cnki.jrme.2014.1148

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Abstract Support crushing disaster caused by dynamic load of main roof is a challenge in high-intensity mining face，theoretical analysis，laboratory test and in-situ monitoring were carried out for analyzing occurred conditions，mechanism and affecting factors of the dynamic impact effect. Nonideal rigid system made up of different strata provided conditions for dynamic failure of surrounding rock，fold catastrophe model of main roofs dynamic fracture was built and main roof showed dynamic fracture because its softening modulus was larger than elastic modulus. With elastic-plastic analysis of main roof，calculation formulas of dissipated plastic power，fracture surface energy and kinetic energy of the block were put forward. Two kinds of roof structures including that fracture line was ahead of mining face or located above the coal wall correctly were built. Then roof structures leading to dynamic impact effect and the impact force were obtained. Increase of advancing speed was equivalent to upgrading the cantilever beams loading speed，and thus amplifying the strain energy stored in main roof and also improving the blocks kinetic energy proportion of the total strain energy. As a result，the probability of main roofs dynamic fracture was magnified. Finally，conclusions were successfully applied into Wangzhuang coal mine and surrounding rock controlling technology and its effect were improved.

Key words： mining engineering high-intensity mining face dynamic load impact effect advancing speed

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	WANG Jiachen
	WANG Zhaohui

Cite this article:

WANG Jiachen,WANG Zhaohui. IMPACT EFFECT OF DYNAMIC LOAD INDUCED BY ROOF IN HIGH-INTENSITY MINING FACE[J]. , 2015, 34(S2): 3987-3997.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1148 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/3987

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