Stress-strain-acoustic responses in failure process of coal rock with different height to diameter ratios under uniaxial compression

作     者：GUO Yu-xia ZHAO Yong-hui WANG Sheng-wei FENG Guo-rui ZHANG Yu-jiang RAN Hong-yu 郭育霞;赵永辉;王胜伟;冯国瑞;张玉江;冉洪宇

作者机构：College of Mining EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi Province Research Centre of Green Mining Engineering TechnologyTaiyuan 030024China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2021年第28卷第6期

页      面：1724-1736页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：Projects(51974192,52004172)supported by the National Natural Science Foundation of China Project(51925402)supported by the Distinguished Youth Funds of National Natural Science Foundation of China Project(U1710258)supported by the Joint Funds of National Natural Science Foundation of China and Shanxi Province,China 

主　　题：residual coal pillar height to diameter ratio uniaxial compression acoustic emission micro-crack evolution 

摘      要：Residual coal pillars play an important role in mining the adjacent coal seam safely,managing the gobs and maintaining the stability of abandoned coal *** height to diameter ratio(H/D)affects the stability of residual coal *** this study,uniaxial compressive tests of coal specimens with five H/D(2.0,1.5,1.0,0.8 and 0.6)were performed,and the stress,strain and acoustic emission(AE)were *** show that the uniaxial compressive strength(UCS)and peak strain increase with H/D *** empirical equation is proposed to calculate the UCS based on the H/*** AE activities during coal failure process can be separated into four *** span of quiet period and rapid decline period shorten with H/D *** smaller the H/D is,the more complicated the failure characteristics of coal will *** failure form of coal with H/D of 2.0,1.5,and 1.0 is primarily shear failure,while splitting failure along the axial direction is the mainly mode when H/D is 0.8 or *** initiation,expansion,aggregation and connection of micro-cracks can be reflected by the real-time spatial evolution of AE event points.