Acoustic emission from gas-filled coal under triaxial compression

作     者：Yin Guangzhi Qin Hu Huang Gun Lv Youchang Dai Zhixu 

作者机构：State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing University State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas SeamChongqing University College of Resource and Environmental SciencesChongqing University Gas Research InstituteEnergy and Chemical Research InstituteZhongping Energy and Chemical Group 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2012年第22卷第6期

页      面：775-778页

核心收录：

学科分类：0819[工学-矿业工程] 0709[理学-地质学] 0808[工学-电气工程] 081903[工学-安全技术及工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：supported by the State Key Basic Research Program of China(No.2011CB201203) the National Scienceand Technology Major Projects of China(No.2011ZX05034-004) the National Natural Science Foundation of China(No.51174241) 

主　　题：Rock mechanics Conventional triaxial compression Failure process Permeability Acoustic emission 

摘      要：Acoustic emission(AE) experiments have been performed on gas-saturated coal specimens under conventional triaxial compression.The AE characteristics were investigated for a methane gas flow through the coal specimen.One AE parameter,AE count,when normalized by the total count number was used to represent the damage evolution in the gassy coal.It is shown that this AE parameter is a reasonable indicator for damage occurring within the coal specimen since its envelope has almost the same shape as the complete stress-strain curve,except for a short time delay.In addition,the change in AE count is highly consistent with the change in coal permeability.Test results also show that methane containing coal emits a small number of AE events before entering the yield stage.AE activity gradually increases during the yield process up to the peak stress.The lowest permeability corresponds to the highest AE activity,implying failure will soon occur.An AE based constitutive model was constructed and the theoretical results agree well with those of experiments.