应力波作用下岩石声发射能量特征  

On the Acoustic Emission (AE) Energy Characteristics of Rock Subjected to Stress Waves

作　　者：万国香[1] 王其胜[2] 李夕兵[3] 

机构地区：[1]嘉应学院物理与光信息科技学院,广东梅州514015 [2]嘉应学院土木工程学院,广东梅州514015 [3]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《实验力学》2012年第6期727-733,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金重大项目(编号:50490274);广东省高校优秀青年创新培育项目(LYM09126);梅州市科学技术局自然科学项目(2011KJY02)

摘　　要：通过霍普金森(SHPB)实验系统,对应力波作用下岩石破坏进行声发射实验,获得了该加载条件花岗岩声发射能量的变化规律。实验结果表明,声发射能量变化呈现出两种明显不同的特征:I型,声发射峰值能量之后,能量迅速衰减,到加载的末期,能量出现一定的回升,产生"拐点";II型,声发射峰值能量之后,能量衰减相对I型较慢,且不出现"拐点"。通过对岩石破碎块度的分析,得到了声发射峰值能量与岩石破碎分维之间的关系。本文的研究有助于重新寻求应力波下岩石破坏的声发射前兆规律。Acoustic emission experiment of rock failure subjected to stress waves was carried out based on SHPB（split Hopkinson pressure bar） experimental system.The variation of acoustic emission energy of granite subjected to this loading was obtained.Experimental results show that the variation of AE energy presents two different features： mode I,energy decays rapidly after peak value,however,at the end of the loading,energy rises and ＂inflection point＂appears;mode II,energy decays slowly after peak value,but no ＂inflection point＂appears.Through analysis of rock fragmentation,relation between the AE peak energy and the fractal dimension value is obtained.Above results may be helpful to both theory and practice for seeking precursory characteristics of AE of rock mass subjected to stress wave.

关 键 词：应力波 声发射 峰值能量 破碎 

分 类 号：TD31[矿业工程—矿井建设]