不同瓦斯压力下煤岩声发射特征试验研究

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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.

Key words： rock mechanics rupture type acoustic emission(AE) characteristics damage analysis

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	QIN Hu 1
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	HUANG Gun1
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	JIANG Changbao1
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	LI Wenpu1
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Cite this article:

QIN Hu 1,2,3, et al. EXPERIMENTAL RESEARCH ON ACOUSTIC EMISSION CHARACTERISTICS OF COAL AND ROCK UNDER DIFFERENT GAS PRESSURES[J]. , 2013, 32(s2): 3719-3725.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3719

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