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STUDY ON REGULARITY OF STRUCTURAL BEHAVIOURS
AROUND COAL FACE UNDER THE SHALLOW-BURIED LOOSE ROOF |
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Abstract The regularity of strata pressure around coal face in Queen seam of PVK colliery in India is analyzed. It has shown that the pressure arch，rather than the beam or plate，can be formed under the shallow-buried and very loose roof. When coal face reaches a certain distance，the pressure arch is destroyed and the initial weighting occurs. When the arch vault is close to ground surface，the rock mass of the key structure inside pressure arch is destroyed and more fierce pressure occurs. Subsequently，the rock mass of the subordinate structure outside the pressure arch is destroyed followed by surface subsidence. The periodic destruction and advancement of arch structure cause the occurrence of periodic pressure. The result reasonably explains the phenomenon that the behavior of ground pressure is very strong even under the very loose roof and can be referred for further studies in similar conditions.
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Received: 24 October 2003
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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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