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| EFFECTS OF INCREASING WORKING FACE¢S LENGTH ON UNDERGROUND PRESSURE BEHAVIORS OF MINING SUPER-HIGH FACES UNDER SHALLOW COAL SEAM |
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Abstract By the industrial mining experiments and observed data of working faces No.51101(240 m in length) and No.51104(300 m in length) in Shangwan coal mine of Shenfu—Dongsheng mining district，the effects of increasing face¢s length on underground pressure¢s behaviors were explored，and the conclusions are drawn as follows：(1) weighting span becomes shorter；(2) cycle weighting strength is relaxed；(3) the rock pressure distribution is shown that the quadric parabola relations can be used for the working face¢s middle point as symmetrical axis(i.e. coordinate origin)；(4) the regression relation between maximum resistances and initial ones is liner；and (5) the support¢s loads in non-weighting period and underground pressure behavior with increasing face¢s length are enhanced，and roof weighting impact load was larger than the support¢s maximum resistance for large mining height and supper-long faces.
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Received: 29 March 2007
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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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