反复浸水对煤样力学性质损伤的声发射实验研究  

The effect of repeated water intrusion on mechanical characters of coal samples by acoustic emission testing

作　　者：姚强岭[1] 王傲[1] 陈田[1] 董祥俭 朱晨光[1] 鲁竞争[1] 

机构地区：[1]中国矿业大学矿业工程学院深部煤炭资源开采教育部重点实验室

出　　处：《采矿与安全工程学报》2016年第5期938-944,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51674248,51304208);江苏省自然科学基金项目(BK20161184);江苏高校优势学科建设工程项目

摘　　要：针对地下水对隔水煤柱和矿井地下水库边界的反复浸水损伤过程,研究反复浸水对煤样的力学性质损伤作用,对矿井地下储水和含水层保护等问题有借鉴意义。文中选择15个不同浸水次数的典型煤样进行单轴压缩声发射实验。研究发现,煤样的峰值应力、弹性模量、应变软化模量、后峰值模量均随着煤样浸水次数的增加而呈现不同程度的减小,而峰值应变随着浸水次数的增加而上升。综上反映了水对煤样的明显弱化作用。声发射累计计数、能率均能很好地表示出裂隙发育的各个阶段,对求取弹性模量研究煤样力学性质有重要作用。实验结果对反复浸水作用下煤样的力学性质和裂隙损伤的研究具有借鉴作用。Due to the damage of waterproof coal pillars and underground reservoir boundaries aroused by repeated water intrusion, the study on mechanical characters of coal samples under repeated water intrusion is helpful to solve the problem of setting the width of waterproof coal pillars and underground reservoir boundaries. In this study, by acoustic emission tests on 15 typical coal samples, this research has found that the peak stress, elastic modulus, strain softening modulus and post-peak stress decrease with the growth of frequencies of water intrusion but peak strain increases because of rising wa- ter-intrusion times, which indicates that remarkable damage is impacted by repeated water intrusion. Both the acoustic emission cumulative counts and energy can precisely illustrate all phases of crack propagation, which is significantly useful to calculate elastic modulus and other coal mechanical prop- erties. The experimental results have reference value for the research on mechanical properties and crack propagation under repeated water intrusion.

关 键 词：反复浸水 力学性质 声发射 裂隙发育 

分 类 号：TD324[矿业工程—矿井建设]