压缩与劈裂条件下矿岩声发射信号的频率特性  

On the frequency characteristics of ore′s acoustic emission signal in uniaxial compression and Brazilian splitting test

作　　者：刘希灵[1] 王金鹏[1] 李夕兵[1] 潘梦成[1] LIU Xi-ling, WANG Jin-peng, LI Xi-bing, PAN Meng-cheng(School of Resources and Safety Engineering, Central South University, Changsha 410083, Chin)

机构地区：[1]中南大学资源与安全工程学院

出　　处：《实验力学》2018年第2期201-208,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金(51204206)资助

摘　　要：为研究岩石在单轴压缩与巴西劈裂加栽条件下声发射信号的频率特性，在RMT-150C岩石力学试验系统上对流纹斑岩开展了单轴压缩和巴西劈裂条件下的声发射实验。实验结果表明：在单轴压缩实验中，声发射信号的峰值频率分布在550kHz以下，550kHz以上的信号极少，并且100kHZ以下的信号占大多数；而巴西劈裂实验中，声发射信号的峰值频率也分布在550kHZ以下，以100～200kHZ的信号为主。此外，岩样在单轴压缩破坏过程中声发射信号的峰值频率在达到峰值应力前明显降低，而巴西劈裂破坏过程中声发射信号的峰值频率主要集中在100～200kHZ之间，在达到峰值应力前50kHZ左右的低频信号开始增多，但变化不明显。In order to study the frequency characteristics of orers acoustic emission signal under the condition of uniaxial compression and Brazilian splitting, an AE experiment was carried out for rhyolite porphyry under above condition and based on rock mechanics testing system （RMT-150C）. Experimental results show that in uniaxial compression experiment, the peak frequencies of AE are mostly below 550kHz, only few signals are above 550kHz, and majority of signals are below 100kHz. While in Brazilian splitting experiment, the peak frequencies of AE are below 550kHz, and majority of signals are between 100~200kHz. In addition, the peak frequency of AE signals decreases obviously before reaching peak stress in sample＇s uniaxial compression process. However, the peak frequencies of AE are mainly distributed between 100-200kHz in Brazil splitting faliure process, and the low frequency signals around 50kHz begin to increase before reaching the peak stress but without significant variation.

关 键 词：岩石声发射 单轴压缩 巴西劈裂 峰值频率 破裂尺度 幅值分布 

分 类 号：TD76[矿业工程—矿井通风与安全]