【作者】 李玉寿； 杨永杰； 杨圣奇； 马占国；

【Author】 LI Yushou1,YANG Yongjie2,YANG Shengqi1,MA Zhanguo1(1.State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221008,PR China;(2.Key Laboratory of Mine Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao 266510,China)

【机构】 中国矿业大学深部岩土力学与地下工程国家重点实验室力学与建筑工程学院； 山东科技大学矿山灾害预防控制省部共建教育部重点实验室；

【摘要】 在MTS815岩石力学试验系统上进行了煤的单轴、三轴及孔隙水作用下全应力应变试验及声发射检测。结果表明:煤的峰值强度、残余强度随围压增高而增大,随孔隙水压增高而降低;在低围压试验范围内,煤的弹性模量不随围压变化;煤在不同试验条件下呈现的声发射特征有显著差异性,单轴试验时各个阶段均有声发射事件产生,三轴及孔隙水试验时,煤样屈服之前声发射事件较少,屈服之后声发射才趋于活跃。单轴试验时煤的声发射能量最大,随孔隙水压增大,煤样变形过程释放的声发射能量逐渐减小。更多还原

【Abstract】 Complete stress-strain test and acoustic emission measurement under uniaxial,triaxial and pore pressure were carried out on the coal samples by adopting MTS 815.02 rock mechanics test system.The experimental results show that the peak strength and residual strength increase with the increase of confining pressure,but reduce with the increase of pore pressure.In the testing range of lower confining pressure,the elastic modulus of coal has great change with the confining pressure.Under different testing conditions,the acoustic emission behaviors of coal have great differences.Under uniaxial compression test,there are all acoustic emission events at each stages,but under triaxial and pore pressure tests,the acoustic emission events of coal sample are smaller before yielding,and tend to be active after yielding.The acoustic emission energy of coal under uniaxial compression is largest.With the increase of pore pressure,the released acoustic emission energy of coal sample decreases step by step in the process of deformation.更多还原