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STUDY ON MECHANICS MODEL OF THE FIRST CAVE IN MAIN ROOF FOR THE LARGE CUTTING HEIGHT FULLY MECHANIZED
MINING UNDER THE TWO HARD CONDITIONS |
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Abstract According to the conditions of hard roof and hard coal，a mechanical model for the full-length working face is proposed，and it is considered that the main roof forms three block mutually hinged plate structure in the full-length model working face. The reasons of the stepped，staged，and migrated roof weighting to the full-length working face are presented. With the elastic plate theory，the stress distributions of plate in the various control boundaries are calculated and it is found that intensity of weighting in the middle of the working face is greater than those of head and end.
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Received: 20 October 2004
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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