红砂岩变形演化及声发射主频特征实验研究
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摘要
以声发射系统和数字散斑相关方法作为实验观测手段,开展红砂岩试件变形场演化及声发射主频特征实验研究。通过单轴加载方式,对一种红砂岩试件加载全过程中的变形场演化、声发射主频信息进行分析,研究红砂岩试件变形场演化与声发射主频分布范围、事件率对应关系以及声发射主频的能量特征。研究结果表明:低主频声发射事件在变形局部化启动时刻开始出现且数量不断增加,随着变形局部化带错动速率增大,声发射主频分布范围显著增加;在红砂岩试件变形局部化阶段,低主频声发射事件率与高主频声发射事件率的量值接近,但量值较小;在应力峰值点处,低主频声发射事件率远大于高主频声发射事件率;在界面滑动阶段,高、低主频声发射事件率量值均较大;红砂岩试件变形破坏过程中,高能量声发射事件主要分布在低主频范围内,低能量声发射事件在高、低主频范围内均有分布。
The digital speckle correlation method was adopted to measure the deformation field.Acoustic emission information was monitored by acoustic emission system.This paper concentrated on acoustic emission characteristics of deformation field evolution of red sandstone rocks.By uniaxial compression,the deformation filed evolution,the correspondence between deformation filed evolution and acoustic emission dominant-frequency range and acoustic emission event rate,energy characteristics of acoustic emission dominant-frequency of red sandstone were studied. The results show that: At the start time of deformation localization,the low dominant-frequency acoustic emission events began to occur,then the number increased.The dominant-frequency distribution of acoustic emission events increased with the increase of dislocation rate.The quantity of low and higher dominant-frequency acoustic emission event rate are close,but the quantity is small.When the macroscopic crack developed of rock specimen,the low dominant-frequency event rate is larger.And the higher dominant-frequency event rate is smaller.At the peak of stress,the low dominant-frequency event rate is much higher than the high dominant-frequency event rate.The value of high and low dominant-frequency acoustic emission event rate is higher at the interface sliding stage.In the process of failure of rock specimens,the high energy acoustic emission events are mainly distributed in the low dominant-frequency range. Low energy acoustic emissionevents are distributed both in high dominant-frequency and low dominant-frequency range.
The digital speckle correlation method was adopted to measure the deformation field.Acoustic emission information was monitored by acoustic emission system.This paper concentrated on acoustic emission characteristics of deformation field evolution of red sandstone rocks.By uniaxial compression,the deformation filed evolution,the correspondence between deformation filed evolution and acoustic emission dominant-frequency range and acoustic emission event rate,energy characteristics of acoustic emission dominant-frequency of red sandstone were studied. The results show that: At the start time of deformation localization,the low dominant-frequency acoustic emission events began to occur,then the number increased.The dominant-frequency distribution of acoustic emission events increased with the increase of dislocation rate.The quantity of low and higher dominant-frequency acoustic emission event rate are close,but the quantity is small.When the macroscopic crack developed of rock specimen,the low dominant-frequency event rate is larger.And the higher dominant-frequency event rate is smaller.At the peak of stress,the low dominant-frequency event rate is much higher than the high dominant-frequency event rate.The value of high and low dominant-frequency acoustic emission event rate is higher at the interface sliding stage.In the process of failure of rock specimens,the high energy acoustic emission events are mainly distributed in the low dominant-frequency range. Low energy acoustic emissionevents are distributed both in high dominant-frequency and low dominant-frequency range.
引文
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[8]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,2015,34(S1):2959-2967.ZHANG Yanbo,LIANG Peng,LIU Xiangxin,et al.Experi-mental study on precursor of rock burst based on acoustic emission signal dominant frequency and entropy[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(S1):2959-2967.
[9]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,2015,34(10):2057-2063.ZHANG Liming,MA Shaoqiong,REN Mingyuan,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,2015,34(10):2057-2063.
[10]MANSUROV V A.Acoustic emission from failing rock behavior[J].Rock Mechanics and Rock Engineering,1994,27(3):173-182.
[11]KNILL J L,FRANKLIN J A,MALONE A W.A study of acoustic emission from stressed rock[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,2000,5(1):87-88.
[12]杨振琦,赵永川,杨天鸿,等.闪长岩单轴加载过程中声发射和弹性波速度变化规律的研究[J].实验力学,2015,30(5):649-657.YANG Zhenqi,ZHAO Yongchuan,YANG Tianhong,et al.Research on the variation of acoustic emission and elastic wave velocity in uniaxial loading process of Diorite[J].Journal of Experimental Mechanics 2015,30(5):649-657.
[13]贾雪娜.应变岩爆试验的声发射本征频谱特征[D].北京:中国矿业大学(北京),2013.JIA Xuena.Experimental study on acoustic emission Eigen-frequency spectrum features of strain bursts[D].Beijing:China University of Mining and Technology(Beijing),2013.
[14]杨小彬,宋义敏,赵同彬.岩石变形破坏演化力学分析[M].北京:煤炭工业出版社,2016.YANG Xiaobin,SONG Yimin,ZHAO Tongbin.Mechanics analysis of deformation and failure of rock[M].Beijing:China Coal Industry Publishing House,2016.
[15]宋义敏.非均匀变形场测量的DSCM及其用于岩石破坏实验研究[D].北京:清华大学,2010.SONG Yimin.Digital speckle correlation method for non-homogenous deformation field measurement and its application to the experimental study of rock failure[D].Beijing:Tsinghua University,2010.
[2]孙强,张卫强,薛雷,等.砂岩损伤破坏的声发射准平静期特征分析[J].采矿与安全工程学报,2013,30(2):237-242.SUN Qiang,ZHANG Weiqiang,XUE Lei,et al.Acoustic emission characteristics in quasi-quiet stage of damage and fracture of sandstone[J].Journal of Mining&Safety Engineering,2013,30(2):237-242.
[3]LOCKNER D.The role of acoustic emission in the study of rock fracture[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1993,30(7):893-899.
[4]张茹,谢和平,刘建锋,等.单轴多级加载岩石破坏声发射特性试验研究[J].岩石力学与工程学报,2006,25(12):2584-2588.ZHANG Ru,XIE Heping,LIU Jianfeng,et al.Experimen-tal study on acoustic emission characteristics of rock failure under uniaxial multilevel loading[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(12):2584-2588.
[5]纪洪广,卢翔.常规三轴压缩下花岗岩声发射特征及其主破裂前兆信息研究[J].岩石力学与工程学报,2015,34(4):694-702.JI Hongguang,LU Xiang.Characteristic of acoustic emission and rock fracture precursors of granite under conventional of triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(4):694-702.
[6]MANTHEI G.Characterization of acoustic emission sources in a rock salt specimen under triaxial compression[J].Bulletin of the Seismological Society of America,2005,95(5):1674-1700.
[7]吴贤振,刘建伟,刘祥鑫,等.岩石声发射振铃累计计数与损伤本构模型的耦合关系探究[J].采矿与安全工程学报,2015,32(1):28-35.WU Xianzhen,LIU Jianwei,LIU Xiangxin,et al.Study on the coupled relationship between AE accumulative ring-down count and damage constitutive model of rock[J].Journal of Mining&Safety Engineering,2015,32(1):28-35.
[8]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,2015,34(S1):2959-2967.ZHANG Yanbo,LIANG Peng,LIU Xiangxin,et al.Experi-mental study on precursor of rock burst based on acoustic emission signal dominant frequency and entropy[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(S1):2959-2967.
[9]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,2015,34(10):2057-2063.ZHANG Liming,MA Shaoqiong,REN Mingyuan,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,2015,34(10):2057-2063.
[10]MANSUROV V A.Acoustic emission from failing rock behavior[J].Rock Mechanics and Rock Engineering,1994,27(3):173-182.
[11]KNILL J L,FRANKLIN J A,MALONE A W.A study of acoustic emission from stressed rock[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,2000,5(1):87-88.
[12]杨振琦,赵永川,杨天鸿,等.闪长岩单轴加载过程中声发射和弹性波速度变化规律的研究[J].实验力学,2015,30(5):649-657.YANG Zhenqi,ZHAO Yongchuan,YANG Tianhong,et al.Research on the variation of acoustic emission and elastic wave velocity in uniaxial loading process of Diorite[J].Journal of Experimental Mechanics 2015,30(5):649-657.
[13]贾雪娜.应变岩爆试验的声发射本征频谱特征[D].北京:中国矿业大学(北京),2013.JIA Xuena.Experimental study on acoustic emission Eigen-frequency spectrum features of strain bursts[D].Beijing:China University of Mining and Technology(Beijing),2013.
[14]杨小彬,宋义敏,赵同彬.岩石变形破坏演化力学分析[M].北京:煤炭工业出版社,2016.YANG Xiaobin,SONG Yimin,ZHAO Tongbin.Mechanics analysis of deformation and failure of rock[M].Beijing:China Coal Industry Publishing House,2016.
[15]宋义敏.非均匀变形场测量的DSCM及其用于岩石破坏实验研究[D].北京:清华大学,2010.SONG Yimin.Digital speckle correlation method for non-homogenous deformation field measurement and its application to the experimental study of rock failure[D].Beijing:Tsinghua University,2010.
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