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| Experimental study of characteristics of irreversibility and fracture precursors of acoustic emission in rock under different confining pressures |
| ZENG Peng1，JI Hongguang1，SUN Lihui1，2，ZHANG Zijian3，GAO Yu1，JIANG Hua1，LI Chengjiang4 |
(1. School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China；
2. College of Resources，Hebei University of Engineering，Handan，Hebei 056038，China；3. Engineering Construction Company，Qingdao Metro Group Co.，Ltd.，Qingdao，Shandong 266000，China；4. Central Research Institute of
Building and Construction Co.，Ltd.，MCC Group，Beijing 100088，China) |
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Abstract Laboratory experiments on the characteristics of acoustic emission(AE) in high and low frequency channels of granite specimens under different confining pressures of cyclic loading and unloading were carried out. The relationships of the time with stress and AE cumulative counts were analyzed. On the basis，the characteristics of AE irreversibility in rock were studied. Then inverse fast Fourier transform(IFFT) was used to denoise the AE signals at Kaiser points and the characteristics of spectrums of denoised signals were analyzed with fast Fourier transform(FFT). The characteristics before the major fracturing in rock were studied. The basic characteristics of AE counts，the Kaiser effect(KE) and the felicity effect(FE) are similar in two frequency channels. The main difference between the characteristics of cumulated AE counts in two frequency channels is the quantity. The dominant frequencies at Kaiser points mainly distribute in the range of 46.39–70.80 and 151.37–166.99 kHz. With the increasing of axial stress level，the dominant frequencies at Kaiser points shift from the lower frequencies to the higher ones in the low frequency channel and shift from the higher frequencies to lower ones in the high frequency channel before the major fracturing in rock. The upper limit of KE of the granite is about 65% of the ultimate compressive strength. The results of the dominant frequencies at Kaiser points provide evidence for the damage and failure of rock.
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[1] KAISER E J. A study of acoustic phenomena in tensile test[R]. Munich：Technical University of Munich，1950.
[2] 卢运虎，陈 勉，金 衍，等. 碳酸盐岩声发射地应力测量方法实验研究[J]. 岩土工程学报，2011，33(8)：1 192–1 196.(LU Yunhu，CHEN Mian，JIN Yan，et al. Experimental study on stress measurement for sound emission in carbonate formation[J]. Chinese Journal of Geotechnical Engineering，2011，33(8)：1 192–1 196.(in Chinese))
[3] 张宁博，齐庆新，欧阳振华，等. 不同应力路径下大理岩声发射特性试验研究[J]. 煤炭学报，2014，39(2)：389–394.(ZHAN Ningbo，QI Qingxin，OUYANG Zhenhua，et al. Experimental on acoustic emission characteristics of marble with different stress paths[J]. Journal of China Coal Society，2014，39(2)：389–394.(in Chinese))
[4] SHKURATNIK V L，FILIMONOV Y L，KUCHURIN S V. Features of the Kaiser effect in coal specimens at different stages of the triaxial axisymmetric deformation[J]. Journal of Mining Science，2007，43(1)：1–7.
[5] 陈宇龙，魏作安，张千贵. 等幅循环加载与分级循环加载下砂岩声发射Felicity效应试验研究[J]. 煤炭学报，2012，37(2)：226–230. (CHEN Yulong，WEI Zuoan，ZHANG Qiangui. Experimental study on felicity effect of acoustic emission in rock under cyclic loading and tiered cyclic loading[J]. Journal of China Coal Society，2012，37(2)：226–230.(in Chinese))
[6] 李庶林，唐海燕. 不同加载条件下岩石材料破裂过程的声发射特性研究[J]. 岩土工程学报，2010，32(1)：147–152.(LI Shulin，TANG Haiyan. Acoustic emission characteristics in failure process of rock under different uniaxial compressive loads[J]. Chinese Journal of Geotechnical Engineering，2010，32(1)：147–152.(in Chinese))
[7] 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. Characteristics of acoustic emission and rock fracture precursors of granite under conventional triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(4)：694–702.(in Chinese))
[8] 杨永杰，王德超，郭明福，等. 基于三轴压缩声发射试验的岩石损伤特征研究[J]. 岩石力学与工程学报，2014，33(1)：98–104.(YANG Yongjie，WANG Dechao，GUO Mingfu，et al. Study of rock damage characteristics based on acoustic emission tests under triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(1)：98–104.(in Chinese))
[9] 张朝鹏，张 茹，张泽天，等. 单轴受压煤岩声发射特征的层理效应试验研究[J]. 岩石力学与工程学报，2015，34(4)：770–778. (ZHANG Zhaopeng，ZHANG Ru，ZHANG Zetian，et al. Experimental research on effects of bedding plane on coal acoustic emission under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(4)：770–778.(in Chinese))
[10] 段 东，赵阳升，冯小静，等. 泥岩实时细观破坏过程及其声发射事件产生机制研究[J]. 中国矿业大学学报，2015，44(1)：29–35.(DUAN Dong，ZHAO Yangsheng，FENG Xiaojing，et al. Mudstone mesoscopic failure process and generation mechanism of acoustic emission events based on real-time loading CT Scan[J]. Journal of China University of Mining and Technology，2015，44(1)：29–35.(in Chinese))
[11] 刘建坡，李元辉，杨宇江. 基于声发射监测循环载荷下岩石损伤过程[J]. 东北大学学报：自然科学版，2011，32(10)：1 476–1 479.(LIU Jianpo，LI Yuanhui，YANG Yujiang. Rock damage process based on acoustic emission monitoring under cyclic loading[J]. Journal of Northeastern University：Natural Science，2011，32(10)：1 476– 1 479.(in Chinese))
[12] 纪洪广，张月征，金 延，等. 二长花岗岩三轴压缩下声发射特征围压效应的试验研究[J]. 岩石力学与工程学报，2012，31(6)：1 162–1 168.(JI Hongguang，ZHANG Yuezheng，JIN Yan，et al. Experimental study of confining pressure effect on acoustic emission characteristics of monzonite granite under triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(6)：1 162–1 168.(in Chinese))
[13] 李浩然，杨春和，刘玉刚，等. 花岗岩破裂过程中声波与声发射变化特征试验研究[J]. 岩土工程学报，2014，36(10)：1 915–1 923.(LI Haoran，YANG Chunhe，LIU Yugang，et al. Experimental research on ultrasonic velocity and acoustic emission properties of granite under failure process[J]. Chinese Journal of Geotechnical Engineering，2014，36(10)：1 915–1 923.(in Chinese))
[14] 宫宇新，何满潮，汪政红，等. 岩石破坏声发射时频分析算法与瞬时频率前兆研究[J]. 岩石力学与工程学报，2013，32(4)：787–799.(GONG Yuxin，HE Manchao，WANG Zhenghong，et al. Research on time-frequency analysis algorithm and instantaneous frequency precursors for acoustic emission data from rock failure experiment[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(4)：787–799.(in Chinese))
[15] CHENG W，WANG W，HUANG S，et al. Acoustic emission monitoring of rockbursts during TBM-excavated headrace tunneling at Jinping II hydropower station[J]. Journal of Rock Mechanics and Geotechnical Engineering，2013，5(6)：486–494.
[16] 何满潮，赵 菲，张 昱，等. 瞬时应变型岩爆模拟试验中花岗岩主频特征演化规律分析[J]. 岩土力学，2015，36(1)：1–8.(HE Manchao，ZHAO Fei，ZHANG Yu，et al. Feature evolution of dominant frequency components in acoustic emissions of instantaneous strain-type granitic rockburst simulation tests[J]. Rock and Soil Mechanics，2015，36(1)：1–8.(in Chinese))
[17] 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))
[18] 赵 奎，王更峰，王晓军，等. 岩石声发射Kaiser点信号频带能量分布和分形特征研究[J]. 岩土力学，2008，29(11)：3 082–3 088. (ZHAO Kui，WANG Gengfeng，WANG Xiaojun，et al. Research on energy distributions and fractal characteristics of Kaiser signal of acoustic emission in rock[J]. Rock and Soil Mechanics，2008，29(11)：3 082–3 088.(in Chinese))
[19] 吴胜兴，张顺祥，沈德建. 混凝土轴心受拉声发射Kaiser效应试验研究[J]. 土木工程学报，2008，41(4)：31–39.(WU Shengxing，ZHANG Shunxiang，SHEN Dejian. An experimental study on Kaiser effect of acoustic emission in concrete under uniaxial tension loading[J]. China Civil Engineering Journal，2008，41(4)：31–39.(in Chinese))
[20] 赵 奎，邓 飞，金解放，等. 岩石声发射Kaiser点信号的小波分析及其应用初步研究[J]. 岩石力学与工程学报，2006，25(增2)： 3 854–3 858.(ZHAO Kui，DENG Fei，JIN Jiefang，et al. Wavelet analysis of Kaiser signal of rock acoustic emission and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.2)：3 854–3 858.(in Chinese)) |
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2016, Vol. 35 
