单轴压缩下煤体声发射特征及损伤演化过程分析  

Coal Acoustic Emission Characteristics and Damage Evolution under Uniaxial Compression

作　　者：赵玉成[1,2] 林斌[1,2] 唐兴宜[2] 龚耀华[2] 刘嘉[2] 高亚楠[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《山东科技大学学报（自然科学版）》2013年第5期1-7,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金重点项目(50834004);国家大学生科研创新训练计划项目(201210290011)

摘　　要：声发射是煤等脆性材料破坏过程中经常伴随的现象,是脆性材料因外力受损在其内部以弹性波快速释放出来的应变能,因应力分布不均匀所导致的由不稳定高能态向稳定的低能态过渡时产生的松弛过程,其活动性反映了煤微观破坏的活动性。通过声发射振铃计数率和能量计数率的特征研究了煤岩在各阶段的损伤演化过程,确定了煤损伤各个阶段的损伤临界值。Accompanied often by the failure process of brittle materials such as coal, acoustic emission phenomenon is the rapid release of strain energy in the internal elastic wave when the brittle material is damaged due to external forces with the uneven distribution of stress caused by the unstable high-energy state to a stable relaxation process in the low energy state transition,whose activity reflects that of coal microscopic damage. In this paper,according to the characteristics of acoustic emission ringing count rate and energy count rate, the damage evolution of coal and rock in various stages of the process was studied, and the damage threshold of the various stages of the coal damage was determined.

关 键 词：单轴压缩 声发射 煤体 损伤 

分 类 号：TU45[建筑科学—岩土工程] TD315[建筑科学—土工工程]