EXPERIMENTAL RESEARCH ON ACOUSTIC EMISSION CHARACTERISTICS OF COAL AND ROCK UNDER DIFFERENT GAS PRESSURES
QIN Hu 1，2，3，HUANG Gun1，2，3，JIANG Changbao1，2，3，LI Wenpu1，2，3
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China； 2. College of Resource 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)
Abstract：Using self-developed triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling of coal containing methane with acoustic emission(AE) monitoring system，this paper carried out experiment on AE characteristics of coal and rock under different gas pressures by conventional triaxial compression. Result of the test shows that，gas pressure plays a role in softening to coal and rock，with the increase of gas pressure，the brittleness of coal and rock weakened in the process of loading but the ductility enhanced，both compressive strength and elastic modulus show a decreasing trend. According to the experimental conclusions that both the relations of AE characteristics of coal and rock and stress-strain，and AE accumulative counts and strain，carried out that during the failure process of conventional triaxial compression，the rupture type of coal and rock without gas is sudden rupture，the rupture type of gaseous coal and rock is stable rupture. On the basis of taking into account the stress and gas pressure caused the damage of coal and rock，established the relation of the damage of coal and rock represented by AE accumulative counts under different gas pressures，and verified by experiments，verification results show that，based on the AE of the relation of the damage of coal and rock，to some extent，truly reflects the failure process and the strength characteristics of gaseous coal and rock.
秦 虎1，2，3，黄 滚1，2，3，蒋长宝1，2，3，李文璞1，2，3. 不同瓦斯压力下煤岩声发射特征试验研究[J]. 岩石力学与工程学报, 2013, 32(s2): 3719-3725.
QIN Hu 1，2，3，HUANG Gun1，2，3，JIANG Changbao1，2，3，LI Wenpu1，2，3. EXPERIMENTAL RESEARCH ON ACOUSTIC EMISSION CHARACTERISTICS OF COAL AND ROCK UNDER DIFFERENT GAS PRESSURES. , 2013, 32(s2): 3719-3725.
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2013, Vol. 32 
