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| ACOUSTIC EMISSION FREQUENCY AND b VALUE CHARACTERISTICS IN ROCK FAILURE PROCESS UNDER VARIOUS CONFINING PRESSURES |
| ZHANG Liming1，2，MA Shaoqiong1，REN Mingyuan1，JIANG Shengqun1，WANG Zaiquan1，2，WANG Jinliang1 |
(1. College of Science，Qingdao University of Technology，Qingdao，Shandong 266033，China；2. Co-operative Innovation Center
of Engineering Construction and Safety in Shandong Peninsula Blue Economic Zone，Qingdao University of Technology，Qingdao，
Shandong 266033，China) |
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Abstract The failure tests on marbles under conventional triaxial loading were carried out. The ringing count rate of acoustic emission(AE) of rock，the frequency as well as the variation of b value at the failure stage and the sign of rock failure under various confining pressures were investigated. The experimental data were processed with the extreme-point symmetric mode decomposition method. The AE in the triaxial compression test was small at the compaction and elastic stages and was larger after entering the plastic stage and was increased significantly after the stress expansion. There was an AE quiet period before the peak strength. AE frequency and b value fluctuated all the time which varied drastically at the initial loading process and stayed at a higher level. At the plastic stage，they changed less and stayed at a lower level. Corresponding to the AE quiet period，there was a period that AE frequency and b value changed relatively small in the plastic stage. Under the lower confining pressures，the AE frequency before rock failure and the value of b dropped dramatically，indicating that the brittle failure of rock occurred. Under the higher confining pressures，the variations of AE frequency before the rock failure and the value of b was relatively stable，suggesting that the progressive failure in rock occurred.
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| [1] 刘学文，林吉中，袁祖贻. 应用声发射技术评价材料疲劳损伤的研究[J]. 中国铁道科学，1997，18(4)：74–81.(LIU Xuewen，LIN Jizhong，YUAN Zuyi. Research on evaluation of material fatigue damage by acoustic emission technology[J]. China Railway Science，1997，18(4)：74–81.(in Chinese))
[2] SHKURATNIK V L，FILIMONOV L，KUCHURIN S V. Regularities of acoustic emission in coal samples under triaxial compression[J]. Journal of Mining Science，2005，41(1)：44–52.
[3] 左建平，裴建良，刘建峰，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))
[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)：2 584–2 588. (ZHANG Ru，XIE Heping，LIU Jianfeng，et al. Experimental study on acoustic emission characteristics of rock failure under uniaxial multilevel loadings[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 584–2 588.(in Chinese))
[5] 陈景涛. 岩石变形特征和声发射特征的三轴试验研究[J]. 武汉理工大学学报，2008，30(2)：94–96.(CHEN Jingtao. Experimental study on triaxial compression deformation and acoustic emission property of rock[J]. Journal of Wuhan University of Technology，2008，30(2)：94–96.(in Chinese))
[6] 王恩元，何学秋，刘贞堂，等. 煤体破裂声发射的频谱特征研究[J]. 煤炭学报，2004，29(3)：289–292.(WANG Enyuan，HE Xueqiu，LIU Zhentang，et al. Study on frequency spectrum characteristics of acoustic emission in coal or rock deformation and fracture[J]. Journal
of China Coal，2004，29(3)：289–292.(in Chinese))
[7] 纪洪广，王宏伟，曹善忠，等. 花岗岩单轴受压条件下声发射信号频率特征试验研究[J]. 岩石力学与工程学报，2012，31(增1)：2 900–2 905.(JI Hongguang，WANG Hongwei，CAO Shanzhong，et al. Experimental research on frequency characteristics of acoustic emission signals under uniaxial compression of granite[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.1)：2 900–2 905.(in Chinese))
[8] 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 of 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))
[9] 李小军，路广奇，李化敏. 基于声发射事件b值变化规律的岩石破坏前兆识别及其局限性[J]. 河南理工大学学报：自然科学版，2010，29(5)：663–666.(LI Xiaojun，LU Guangqi，LI Huamin. Identification of the predictive information of rockmass failure based on the law of b-value change of acoustic emission events and its deficiency[J]. Journal of Henan Polytechnic University：Natural Science，2010，29(5)：663–666.(in Chinese))
[10] 刘力强，马胜利，马 瑾，等. 不同结构岩石标本声发射b值和频谱的时间扫描及其物理意义[J]. 地震地质，2001，23(4)：481–492. (LIU Liqiang，MA Shengli，MA Jin，et al. Temporal scanning of b value and spectrum of AE activity for samples with different textures and their physical implications[J]. Seismology and Geology，2001，23(4)：481–492.(in Chinese))
[11] WANG J L，LI Z J. Extreme-point symmetric mode decomposition method for data analysis[J]. Advance in Adaptive Data Analysis，2013，5(3)：1–40.
[12] 张黎明，任明远，马绍琼，等. 大理岩卸围压破坏全过程的声发射及分形特征[J]. 岩石力学与工程学报，2015，34(增1)：2 862–2 867. (ZHANG Liming，REN Mingyuan，MA Shaoqiong，et al. Acoustic emission and fractal characteristics of marble during unloading failure process[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.1)：2 862–2 867.(in Chinese))
[13] 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 and Safety Engineering，2013，30(2)：237–242.(in Chinese))
[14] CAMONESA L A M，EURÍPEDES D A V J，FIGUEIREDOB R P D，et al. Application of the discrete element method for modeling of rock crack propagation and coalescence in the step-path failure mechanism[J]. Engineering Geology，2013，153(8)：80–94.
[15] 尹贤刚，李庶林，唐海燕，等. 岩石破坏声发射平静期及其分形特征研究[J]. 岩石力学与工程学报，2009，28(增2)：3 383–3 390. (YIN Xiangang，LI Shulin，TANG Haiyan，et al. Study on quiet period and its fractal characteristics[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.2)：3 383–3 390.(in Chinese))
[16] GUTENBERG B，RICHTER C F. Frequency of earthquakes in California[J]. Bulletin of The Seismological Society of America，1944，34(4)：185–188.
[17] 曾正文，马 谨，刘力强，等. 岩石破裂扩展过程中的声发射b值动态特征及意义[J]. 地震地质，1995，17(1)：7–11.(ZENG Zhengwen，MA Jin，LIU Liqiang，et al. b-value dynamic features of AE during rock mass fracturing and their significances[J]. Seismology and Geology，1995，17(1)：7–11.(in Chinese))
[18] 杨永明，鞠 杨，陈佳亮，等. 三轴应力下致密砂岩的裂纹发育特征与能量机制[J]. 岩石力学与工程学报，2014，33(4)：691–698. (YANG Yongming，JU Yang，CHENG Jialiang，et al. Cracks development features and energy mechanism of dense sandstone subjected to triaxial stress[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(4)：691–698.(in Chinese)) |
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2015, Vol. 34 
