EXPERIMENTAL STUDY OF ACOUSTIC EMISSION CHARACTERISTICS OF COAL SAMPLES WITH DIFFERENT MOISTURE CONTENTS IN PROCESS OF COMPRESSION DEFORMATION AND FAILURE
QIN Hu1，2，3，HUANG Gun1，2，3，WANG Weizhong1，2，3
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；3. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400030，China)
Abstract：Focusing on anthracites of No.3 coal seam in Zhaozhuang Mine，Jincheng Coal Mining Group，an experimental study was carried out to investigate the acoustic emission(AE) characteristics of coal samples with different moisture contents in conventional uniaxial compression test，by using island AG–250kN rigid rock testing machine，digital strain data acquisition instrument，AE monitoring system and self-developed coal-gas coupling micromechanics experimental device. The results show that the strength and AE characteristics of coal samples with different moisture contents have significant difference；and with the increase of moisture content of coal，uniaxial compressive strength of coal sample decreases gradually. The coal sample has greater strength and larger deformation in failure process；and it is almost linear elastic deformation happens before peak，continuing for a long time. In densification region，coal samples with different moisture contents have no AE signal，but there are only a small amount of signals in coal samples in dry state，basically without change. And its average AE event rate is 4–10 times as many as coal samples with different moisture contents. In elastic stage，the AE event rates of coal samples with different moisture contents and samples in dry state are all relatively steady and similar，but the duration of AE event rate in coal samples is longer in dry state. In the plastic stage，the AE signals in the two kinds of coal samples increase evidently. Average AE of coal samples in this stage is 5–7 times as many as that in elastic stage. In the failure stage，the duration of AE event rate of coal samples with different moisture contents is lower than those in dry state. Increasing water content makes ring count reduced，and the time of obvious AE lag. Experiment results show that water has obvious effects on the mechanical properties and AE characteristics of coal samples.
秦 虎1，2，3，黄 滚1，2，3，王维忠1，2，3. 不同含水率煤岩受压变形破坏全过程声发射特征试验研究[J]. 岩石力学与工程学报, 2012, 31(6): 1115-1120.
QIN Hu1，2，3，HUANG Gun1，2，3，WANG Weizhong1，2，3. EXPERIMENTAL STUDY OF ACOUSTIC EMISSION CHARACTERISTICS OF COAL SAMPLES WITH DIFFERENT MOISTURE CONTENTS IN PROCESS OF COMPRESSION DEFORMATION AND FAILURE. , 2012, 31(6): 1115-1120.
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2012, Vol. 31 
