不同应变率下岩石破裂与声发射响应特征研究  

Rock Failure Characteristics and Acoustic Emission Response Under Different Strain Rates

作　　者：王冠 井广成 王常彬[2,3] 丁言露 刘赛 姚肖肖[2,3] WANG Guan;JING Guang-cheng;WANG Chang-bin;DING Yan-lu;LIU Sai;YAO Xiao-xiao(Xuzhou Mining Group Shaanxi Guojiahe Coal Co.,Ltd.,Baoji,Shaanxi,721000;Key Laboratory of Deep Coal Resource Exploitation,Ministry of Education,School of Mining Engineering,China University of Mining and Technology,Xuzhou,Jiangsu,221116;Coal Resources and Safety,China University of Mining and Technology National Key Laboratory of Mining,Xuzhou,Jiangsu,221116)

机构地区：[1]徐州矿务集团陕西郭家河煤业有限责任公司,陕西宝鸡721000 [2]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,江苏徐州221116 [3]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《煤炭科技》2018年第3期29-33,共5页Coal Science & Technology Magazine

基　　金：国家重点研发计划(2016YFC0801406);国家自然科学基金面上项目(51674253);江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)

摘　　要：为揭示冲击倾向性砂岩在不同应变率条件下的损伤演化规律,基于MTS岩石力学试验系统与PAC声发射信号采集系统,试验研究了不同单轴应变率作用下岩石损伤演化与声发射参量响应特征。研究表明,随着加载应变率增加,岩样极限强度明显提升,峰值强度对应应变值整体降低,达到峰值强度所需时间随应变率呈幂函数减少。应变率与AE累计撞击数、事件数、振铃数之间具有显著的负幂函数关系;相反,应变率越高,微裂隙在发育、扩展过程中所释放的AE平均能量越高。In this paper, to reveal the damage evolution law of sandstone at different strain rates, based on MTS loading system and PAC acoustic emission（AE） system, rock damage law and AE parameters response under different uniaxial strain rates were studied. The results showed that with the increase of loading rate, rock peak strength increases obviously, and its corresponding strain value decreases slightly, while the time of reaching the peak strength decreases as power function. There is a significant negative power function relationship between strain rate and the AE cumulative hits, event number and ringing counts;on the contrary, the higher the strain rate, the higher the average AE energy released by microcracks developing and expanding.

关 键 词：应变率 声发射 参量响应 损伤 

分 类 号：TD324[矿业工程—矿井建设]