采矿与安全工程学报2015，Vol.32Issue(4)：665-670,676,7.DOI:10.13545/j.cnki.jmse.2015.04.023
含水煤样破裂过程中的声发射及分形特性研究
Acoustic emission and fractal characteristics of saturated coal samples in the failure process
摘要
Abstract
To study the acoustic emission (AE) and fractal characteristics of saturated coal samples, focusing on coal samples of No.3 coal seam in Yuwu coal mine, an experimental study was carried out to investigate the acoustic emission characteristics of the dry, natural and saturated coal samples under uniaxial compression, by using RMT-150C rock mechanics test system and AE-win E1.86 acoustic emission instrument, and the fractal characteristics of acoustic emission count sequence was further an-alyzed. The results show that the uniaxial compressive strength decreases when the water content of coal samples increases. The acoustic emission evolution processes of dry, natural and saturated coal samples are similar, which can be divided into three stages, that is, the initial quiet period, the active pe-riod, and the post peak quiet period. Compared with the dry coal samples, the acoustic emission count of natural coal samples reduces 49.95%, and the cumulative acoustic emission count reduces 37.04%,while the acoustic emission count of saturated coal samples reduces 77.48%, and the cumulative acous-tic emission count reduces 52.17%. All of the dry, natural and saturated coal samples have the fractal characteristics, and the fractal dimension value of acoustic emission presents the phenomenon of rising, drop and maximal value, which can be used as the precursor information of dynamic disaster prediction.关键词
饱和煤样/声发射/单轴压缩/分形/关联维数Key words
saturated coal sample/acoustic emission/uniaxial compression/fractal/correlation dimension分类
资源环境引用本文复制引用
高保彬,李回贵,李化敏,李林,苏承东..含水煤样破裂过程中的声发射及分形特性研究[J].采矿与安全工程学报,2015,32(4):665-670,676,7.基金项目
国家自然科学基金委员会-河南省人民政府人才培养联合基金项目(U1304502) （U1304502）
河南省重点实验室基金项目(WS2012B06) （WS2012B06）
河南省教育厅自然科学基金项目(12A440004) （12A440004）
