单轴受压煤岩声发射特征的层理效应试验研究

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摘要层理对煤岩体宏、细观力学性质都有重要影响。为探究不同层理方向煤岩体的损伤演化规律及变形破坏中的声发射特征，分轴向平行层理和轴向垂直层理两种情况进行煤岩制样，采用MTS815岩石力学试验系统和PAC声发射仪，开展了单轴加载条件下破坏全过程的声发射(AE)试验研究，揭示了煤岩AE时序参数、能量释放规律、空间演化特征和AE振幅分布的层理效应。研究表明：相比于轴向垂直层理煤岩，轴向平行层理煤岩在整个受力过程中AE振铃计数和能量释放更强，但单位时间的AE振铃数和能量释放更平缓，轴向垂直层理煤岩呈现急剧猛烈的能量释放特征；轴向平行层理煤岩中，一定规模的AE事件在更低应力水平就会产生，其AE空间分布更加均匀，无轴向垂直层理煤岩的成核现象；在变形破坏全过程中，轴向平行层理煤岩AE振幅分布变化幅度较小，其b值更大，大尺度AE事件比例更低。研究成果在一定程度上反映了煤矿开采过程中工作面和上覆煤岩的层理方向对其声发射特征的影响，可对现场声发射监测围岩破坏情况提供借鉴和参考。

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关键词 ：煤岩, 声发射, 微破裂, 能量释放, 层理效应

Abstract：Bedding has a great influence on the macroscopic and microscopic mechanical properties of coal. In order to explore damage evolution and AE characteristics of coal with different bedding plane direction during the deformation and failure，coal samples are prepared as two types，i.e. axis parallel to bedding plane direction and vertical to bedding plane direction. Experiments on acoustic emission characteristics of full-regime failure of samples under uniaxial compression，are carried out by the MTS815 rock mechanics and the PAC AE testing system in laboratory. Effect of bedding plane direction on characteristics of AE time parameters and energy release，AE location distribution and AE amplitude distribution are revealed. The results show that compared to the samples with axis vertical to bedding plane direction，AE ringdown count and energy release of samples with axis parallel to bedding plane direction are stronger during the whole loading process，while AE ringdown count and energy release in unit time are smoother. Coal samples with axis vertical to bedding plane direction present the fiercer energy release characteristics；A mount of AE events are produced at lower stress level in the samples with axis parallel to bedding plane direction，where AE location distribution are more homogenous，and there are no nuclear phenomena；For the samples with axis parallel to bedding plane direction，during the deformation and failure ，the variation of AE amplitude distribution is smaller，b value is greater and proportion of big AE events is smaller. To a certain extent，experimental results show bedding plane direction has an obvious effect on AE features of working face and overlying coal during process of mining，and also provide the references for monitoring the state of surrounding rock by AE technique in the field.

Key words： coal acoustic emission microcrack energy release effect of bedding plane direction

引用本文:

张朝鹏1，2，张茹1，2，李核归1，2. 单轴受压煤岩声发射特征的层理效应试验研究[J]. 岩石力学与工程学报, 2015, 34(04): 770-778.
ZHANG Zhaopeng1，2，ZHANG Ru1，2，LI Hegui1，2. EXPERIMENTAL RESEARCH ON EFFECTS OF BEDDING PLANE DIRECTION ON COAL ACOUSTIC EMISSION CHARACTERISTICS UNDER UNIAXIAL COMPRESSION. , 2015, 34(04): 770-778.

链接本文:

http://www.rockmech.org/CN/Y2015/V34/I04/770

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