刘希灵,崔佳慧,王金鹏,李夕兵,潘梦成

• 1:中南大学资源与安全工程学院

摘要(Abstract)：

为了研究在动载荷下岩石破裂的声发射特性,采用霍普金森(SHPB)实验系统对三种岩石进行不同应变率下的冲击载荷破坏实验,同步采集破坏过程的声发射参数,从应力—应变、幅值分布、振铃计数变化以及峰值频率分布等方面进行了分析与研究。实验结果表明:力学特性方面,随着应变率增大,三种岩石的动态强度随之增大,极限应变也随之增大,且岩石试样的破碎程度随之增大,表现为碎块的尺寸减小、块数增加、碎屑增多。在声发射特性方面,三种岩石的峰值频率主要在550 k Hz以下,且随着应变率的增加,三种岩石的振铃计数都随之增大,低幅值信号比例增加,峰值频率在100 k Hz以下的低频信号随之减少,100~200k Hz以及400~550 k Hz的中高频信号随之增多,说明峰值频率有向中高频移动的趋势。

关键词(KeyWords)： 岩石声发射;冲击载荷;SHPB;应变率;峰值频率

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金“动载荷下岩石起裂与裂纹扩展的声发射特性研究”(51204206);国家自然科学基金“深部硬岩开挖系统中岩爆灾害发生机理和动力学解释”(41272304)

作者(Author): 刘希灵,崔佳慧,王金鹏,李夕兵,潘梦成

参考文献(References)：

• [1]纪洪广,刘翔宇,曾鹏,等.高强混凝土单轴压缩声发射频率特征试验研究[J].应用声学,2016(3):248-254.[1]JI Hong-guang,LIU Xiang-yu,ZENG Peng,et al.Experimental studies of frequency characteristics of the acoustic emission of the high-strength concrete under the uniaxial compression process[J].Journal of Applied Acoustics,2016(3):248-254.(in Chinese)
• [2]OHNAKA M,MOGI K.Frequency characteristics of acoustic emission in rocks under uniaxial compression and its relation to the fracturing process to failure[J].Journal of Geophysical Research Atmospheres,1982,87(87):3873-3884.
• [3]OHNAKA M,MOGI K.Frequency dependence of acoustic emission activity in rocks under incremental,uniaxial compression[J].Bulletin of the Earthquake Research Institute,University of Tokyo,1981(56):67-89.
• [4]张黎明,马绍琼,任明远,等.不同围压下岩石破坏过程的声发射频率及b值特征[J].岩石力学与工程学报,2015(10):2057-2063.[4]ZHANG Li-ming,MA Shao-qiong,REN Ming-yuan,et al.Acoustic emission frequency and b value characteristics in rock failure process under various confining pressures[J].Chinese Journal of Rock Mechanics and Engineering,2015(10):2057-2063.(in Chinese)
• [5]张艳博,梁鹏,刘祥鑫,等.基于声发射信号主频和熵值的岩石破裂前兆试验研究[J].岩石力学与工程学报,2015(S1):2959-2967.[5]ZHANG Yan-bo,LIANG Peng,LIU Xiang-xin,et al.Experimental study on precursor of rock burst based on acoustic emission signal dominant-frequency and entropy[J].Chinese Journal of Rock Mechanics and Engineering,2015(S1):2959-2967.
• [6]SCHOLZ C H.The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes[J].Bulletin of the Seismological Society of America,1968a,58:399-415.
• [7]BENSON P M,VINCIGUERRA S,Meredith P G,et al.Laboratory simulation of volcano seismicity[J].Science,2008,322(5899):249-252.
• [8]翟越,马国伟,赵均海,等.花岗岩在单轴冲击压缩荷载下的动态断裂分析[J].岩土工程学报,2007(3):385-390.[8]ZHAI Yue,MA Guo-wei,ZHAO Jun-hai,et al.Dynamic failure analysis on granite under uniaxial impact compressive load[J].Chinese Journal of Geotechnical Engineering,2007(3):385-390.(in Chinese)
• [9]李明,茅献彪.冲击载荷作用下砂岩破坏及能量耗变率效应的数值模拟研究[J].爆破,2014,31(2):78-83.[9]LI Ming,MAO Xian-biao.Numerical simulation studies on strain rate effect of sandstone's energy dissipation and destruction under impulse loading[J].Blasting.2014,31(2):78-83.(in Chinese)
• [10]LIU Xi-ling,LI Xi-bing,HONG Liang,et al.Acoustic emission characteristics of rock under impact loading[J].Journal of Central South University,2015,22(9):3571-3577.
• [11]饶蒙,刘希灵,潘梦成,等.动静载荷下岩石声发射特性的对比研究[J].世界科技研究与发展,2016,38(4):783-787.[11]RAO Meng,LIU Xi-ling,PAN Meng-cheng,et al.Contrastive study of rock acoustic emission characteristics under impact loading and static loading[J].World SciTech R&D,2016,38(4):783-787.(in Chinese)
• [12]许金余,刘石.大理岩冲击加载试验碎块的分形特征分析[J].岩土力学,2012,33(11):3225-3229.[12]XU Jin-yu,LIU Shi.Research on fractal characteristics of marble fragments subjected to impact loading[J].Rock and Soil Mechanics,2012,33(11):3225-3229.(in Chinese)
• [13]BURLINI L,VINCIGUERRA S,TORO G D,et al.Seismicity preceding volcanic eruptions:New experimental insights[J].Geology,2010,35(2007):183-186.
• [14]VINOGRADOV S D.Experimental study of the distribution of fractures in respect to the energy liberated by the destruction of rocks[J].Bulletin(Izvestiya),Academy of Sciences of the USSR,Geophysical Series,1962:171-180.
• [15]张艳博,梁鹏,田宝柱,等.花岗岩灾变声发射信号多参量耦合分析及主破裂前兆特征试验研究[J].岩石力学与工程学报,2016,35(11):2248-2258.[15]ZHANG Yan-bo,LIANG Peng,TIAN Bao-zhu,et al.Multi parameter coupling analysis of acoustic emission signals of granite disaster and the precursor characteristics of the main rupture[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(11):2248-2258.(in Chinese)