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| EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF COAL CONTAINING METHANE UNDER DIFFERENT LOADING-UNLOADING CONDITIONS |
| YIN Guangzhi1，2，3，LI Wenpu1，2，LI Minghui1，2，JIANG Changbao1，2，3，QIN Hu1，2，WANG Menglai4 |
| (1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；3. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400030，China；4. National Engineering Research Center of Phosphate Resources Development and Utilization，Yunnan Phosphate Chemical Group Co.，Ltd.，Kunming，Yunnan 650113，China) |
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Abstract Based on the self-made triaxial servo-controlled seepage equipment for thermo-hydro-mechanical coupling of coal containing methane，the experimental study of mechanical properties of coal containing methane was performed on raw coal samples in No.10 Mine，Pingdingshan Coal Mining Group Corporation Ltd.，under different loading-unloading conditions i. e. increase axial pressure and unload confining pressure. The results show that mechanical properties of coal containing methane under different loading-unloading conditions are different；bearing strength of coal sample under loading-unloading is lower than peak intensity of coal sample under conventional loading；bearing strength of coal under loading-unloading decreases exponentially with the increasing of initial axial force，bearing strength decreases with increase in axial pressure loading speed which presents the power function relationship；it decreases exponentially with the increase in initial confining pressure，it decreases with increase in gas pressure which presents the linear relationship；with increase in axial strain，deformation modulus under different conditions presents the trend which decreases rapidly first then decreases slowly until to remain approximate stable after failure；the Poisson?s ratio exhibits the tendency that first decreases then increases and maintains stability at last. The research has an important guiding significance on tunnel supporting and gas extraction.
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Received: 09 October 2012
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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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2013, Vol. 32 
