预制孔岩石破坏过程中的声发射时空演化特征研究

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摘要选取粗粒花岗岩和细粒砂岩，通过预制方孔和圆孔，开展单轴加载条件下岩石破坏声发射试验。采用单纯形定位算法，对岩石破裂过程中的声发射时空演化规律进行研究，并对声发射活动特征、能量释放率和空间相关长度进行分析。研究结果表明：对于预制孔间距与预制孔尺寸相同的试件，声发射事件主要在岩石中部群集，试件以中部剪切破坏为主，声发射三维定位事件直观反映裂纹初始、扩展直至贯通的动态演化过程；在整个加载过程中，颗粒较粗且大小不均的花岗岩试件声发射活动性较强，颗粒较细且均匀的砂岩试件声发射活动性在加载后期才开始增强；岩石破坏前，小尺度裂纹合并贯通形成大尺度裂纹，声发射率下降，能量释放率增强，出现声发射信号“平静”而能量释放“不平静”的现象；岩石在受载过程中，应力场通过迁移和重新分布逐步建立起长程相关性；岩石破坏前，空间相关长度显著增加，且在岩石破坏时达到最大值。

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关键词 ：岩石力学, 岩石破坏, 预制孔, 声发射, 三维定位, 空间相关长度

Abstract：Acoustic emission(AE) technique was employed to measure the AE signals of coarse-grained granite and fine-grained sandstone with prefabricated square holes or circular holes under uniaxial compression test. AE time-space evolution characteristics during failure process were studied based on simplex locating algorithm. AE activities characteristics，AE energy release rate and spatial correlation length were also analyzed. The results show that the three-dimensional location of AE events directly reflects the process of initiation，propagation and evolution of microcracks and the stress redistribution within the specimens. For specimens that the distance of prefabricated holes is same with the prefabricated hole size，located AE event are clustered in the central of specimens；and shear failure occurs in the center area of specimens. The AE activities of granite with coarse and heterogeneous grains isn?t much stronger during the whole loading phase；while the AE activates of sandstone with thin and homogeneous grains isn?t enhanced until the later period of loading. Before the failure of rock，microcracks coalescence into large scale cracks，which result in AE activates weaken and AE energy release rate increases；during this phase，many AE signals are superimposing，which induces the AE quiet period and blank area of located AE events occurred. During rock fracture process，long-range correlations are established by redistribution of stress field，which cause the spatial correlation length obviously increasing before rock failure and reach its maximum value when rock failure.

Key words： rock mechanics rock failure prefabricated hole acoustic emission(AE) 3D location spatial correlation length

收稿日期: 2012-05-07

引用本文:

刘建坡，徐世达，李元辉，东龙宾，魏炯. 预制孔岩石破坏过程中的声发射时空演化特征研究[J]. 岩石力学与工程学报, 2012, 31(12): 2538-2547.
LIU Jianpo，XU Shida，LI Yuanhui，DONG Longbin，WEI Jiong. STUDIES OF AE TIME-SPACE EVOLUTION CHARACTERISTICS DURING FAILURE PROCESS OF ROCK SPECIMENS WITH PREFABRICATED HOLES. , 2012, 31(12): 2538-2547.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/I12/2538

[20]	BRUCE A，WALLACE D. Critical point phenomena：universal physics at large length scales[C]// The New Physics. New York：Cambridge University Press，1989：236-267. " target="_blank">
[24]	LOCKNER D A，BYERLEE J D. Fault growth and acoustic emissions in confined granite[J]. Applied Mechanics Reviews，1992，45(3)：165-173. " target="_blank">
[25]	张永兴，胡居义，何青云，等. 基于强度折减法小净距隧道合理净距的研究[J]. 水文地质工程地质，2006，(3)：64-67.(ZHANG Yongxing，HU Juyi，HE Qingyun，et al. On rational clear spacing of tunnel with small clear spacing based on strength reduction technique[J]. Hydrogeology and Engineering Geology，2006，(3)：64-67.(in Chinese)) " target="_blank">
[26]	江权，冯夏庭，周辉. 锦屏二级水电站深埋引水隧洞群允许最小间距研究[J]. 岩土力学，2008，29(3)：656-662.(JIANG Quan，FENG Xiating，ZHOU Hui. Study on acceptable minimum interval of long deeply burial hydropower tunnels in Jinping II hydropower station[J]. Rock and Soil Mechanics，2008，29(3)：656-662.(in Chinese)) " target="_blank">
[1]	LOCKNER D A. The role of acoustic emission in the study of rock fracture[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1993，30(7)：883-899. " target="_blank">
[18]	荣代潞，李亚荣，刘旭宙. 甘肃及邻近地区几次中强地震前地震空间相关长度增长的研究[J]. 地震学报，2004，26(5)：509-515. (RONG Dailu，LI Yarong，LIU Xuzhou. Study of growing correlation length prior to the earthquakes occurred in Gansu province and its nearby area[J]. Acta Seismologica Sinica，2004，26(5)：509-515.(in Chinese)) " target="_blank">
[22]	刘振，周蕙兰. 单键群方法的算法研究和程序实现[J]. 中国科学院研究生院学报，1997，14(1)：57-65.(LIU Zhen，ZHOU Huilan. Study on single-link cluster algorithm and its implementation[J]. Journal of the Graduate School of the Chinese Academy of Sciences，1997，14(1)：57-65.(in Chinese)) " target="_blank">
[2]	SCHOLZ C H. Experimental study of the fracturing process in brittle rock[J]. Journal of Geophysical Research，1968，73(4)：1 447-1 454. " target="_blank">
[3]	林峰，李庶林，薛云亮，等. 基于不同初值的微震源定位方法[J]. 岩石力学与工程学报，2010，29(5)：996-1 002.(LIN Feng，LI Shulin，XUE Yunliang，et al. Microseismic sources location methods based on different initial values[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：996-1 002.(in Chinese))
[4]	RABINOWITZ N，KULHANEK O. Application of a nonlinear algorithm to teleseismic locations using P-wave readings from the Swedish seismographic network[J]. Physics of the Earth and Planetary Interiors，1988，50(2)：111-115. " target="_blank">
[5]	LEI X L，KUSUNOSE K，RAO M V M S，et al. Quasi-static fault growth and cracking in homogeneous brittle rock under triaxial compression using acoustic emission monitoring[J]. Journal of Geophysical Research，2000，105(B3)：6 127-6 139. " target="_blank">
[6]	胡新亮，马胜利，高景春，等. 相对定位方法在非完整岩体声发射定位中的应用[J]. 岩石力学与工程学报，2004，23(2)：277-283. (HU Xinliang，MA Shengli，GAO Jingchun，et al. Location of acoustic emission in non-integral rock using relative location method[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(2)：277-283.(in Chinese))
[7]	陈炳瑞，冯夏庭，李庶林，等. 基于粒子群算法的岩体微震源分层定位方法[J]. 岩石力学与工程学报，2009，28(4)：740-749.(CHEN Bingrui，FENG Xiating，LI Shulin，et al. Microseismic sources location with hierarchical strategy based on particle swarm optimization[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(4)：740-749.(in Chinese))
[8]	许江，李树春，唐晓军，等. 单轴压缩条件下岩石声发射定位实验的影响因素分析[J]. 岩石力学与工程学报，2008，27(4)：765-772.(XU Jiang，LI Shuchun，TANG Xiaojun，et al. Influential factors of acoustic emission location experiment of rick under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(4)：765-772.(in Chinese))
[10]	CHANG S H，LEE C I. Estimation of cracking and damage mechanisms in rock under triaxial compression by moment tensor analysis of acoustic emission[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(7)：1 069-1 086. " target="_blank">
[11]	赵兴东，李元辉，袁瑞甫，等. 基于声发射定位的岩石裂纹动态演化过程研究[J]. 岩石力学与工程学报，2007，26(5)：944-949. (ZHAO Xingdong，LI Yuanhui，YUAN Ruifu，et al. Study on crack dynamic propagation process of rock samples based on acoustic emission location[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(5)：944-949.(in Chinese))
[13]	LI Y H，LIU J P，ZHAO X D，et al. Experimental studies of the change of spatial correlation length of acoustic emission events during rock fracture process[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(8)：1 254-1 262. " target="_blank">
[14]	左建平，裴建良，刘建锋，等. 煤岩体破裂过程中声发射行为及时空演化机制[J]. 岩石力学与工程学报，2011，30(8)：1 564-1 570. (ZUO Jianping，PEI Jianliang，LIU Jianfeng，et al. Investigation on acoustic emission behavior and its time-space evolution mechanism in failure process of coal-rock combined body[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(8)：1 564-1 570.(in Chinese)) " target="_blank">
[15]	CAI M，MORIKA H，KAISER P K，et al. Back-analysis of rock mass strength parameters using AE monitoring data[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(4)：538-549.
[17]	ZÖLLER G，HAINZL S，KURTHS J. Observation of growing correlation length as an indicator for critical point behavior prior to large earthquakes[J]. Journal of Geophysical Research，2001，106(B2)：2 167-2 175. " target="_blank">
[19]	TYUPKIN Y S，GIOVAMBATTISTA R D. Correlation length as an indicator of critical point behavior prior to a large earthquake[J]. Earth and Planetary Science Letters，2005，230(1/2)：85-96. " target="_blank">
[21]	FROHILCH C，DAVIS S D. Single-link cluster analysis as a method to evaluate spatial and temporal properties of earthquake catalogues[J]. Geophysical Journal International，1990，100(1)：19-32. " target="_blank">
[23]	马延路，周蕙兰. 用单键群方法研究中国地震时空分布的统计特征[J]. 地球物理学报，2000，43(2)：175-183.(MA Yanlu，ZHOU Huilan. Temporal and spatial statistical characteristics of earthquakes in China by single-link cluster method[J]. Chinese Journal of Geophysics，2000，43(2)：175-183.(in Chinese))
[9]	LEI X L，TAKASHI S. Indicators of critical point behavior prior to rock failure inferred from pre-failure damage[J]. Tectonophysics，2007，431(1/2/3/4)：97-111. " target="_blank">
[12]	李元辉，刘建坡，赵兴东，等. 岩石破裂过程中的声发射b值及分形特征研究[J]. 岩土力学，2009，30(9)：2 559-2 563.(LI Yuanhui， LIU Jianpo，ZHAO Xingdong，et al. Study on b-value and fractal dimension of acoustic emission during rock failure process[J]. Rock and Soil Mechanics，2009，30(9)：2 559-2 563.(in Chinese)) " target="_blank">
[16]	陈炳瑞，冯夏庭，肖亚勋，等. 深埋隧洞TBM施工过程围岩损伤演化声发射试验[J]. 岩石力学与工程学报，2010，29(8)：1 562-1 569. (CHEN Bingrui，FENG Xiating，XIAO Yaxun，et al. Acoustic emission test on damage evolution of surrounding rock in deep tunnel during TBM excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(8)：1 562-1 569.(in Chinese)) " target="_blank">