Experimental study on burst tendency of water-bearing coal and its acoustic emission-charge time frequency domain signal characteristics

doi:10.16265/j.cnki.issn1003-3033.2017.11.018

Abstract

Abstract: In order to predict the rock burst tendency accurately, experiments were carried out on samples of water-bearing coal from Fuxin by using a loading system and signal monitoring systems. The relationships between the rock burst tendency and AE-charge time-frequency domain signals in the failure process were studied. Three conditions, drying 24 hours, natural and the saturated, were considered. The experimental results show that, as the moisture content of coal decreases, the coal rock burst tendency stronger becomes, that change in the signals is regular in the failure process, that in time domain, with coal rock burst tendency becoming stronger, AE waveform and charge are more intensive, and the amplitudes become higher at intensification stage and post-peak stage, and that in frequency domain, a stronger rock bust tendency makes frequency of AE-charge spectrogram shift to low-frequency domain, and the amplitudes of signals in low frequency state greater.

Key words: moisture content coal, acoustic emission(AE)-charge time-frequency domain signal, rock burst tendency, AE waveform, amplitude of signals

CLC Number:

X936

XIAO Xiaochun, JIN Chen, WU Di, DING Xin, YU Fei. Experimental study on burst tendency of water-bearing coal and its acoustic emission-charge time frequency domain signal characteristics[J]. China Safety Science Journal, 2017, 27(11): 103-108.

References

[1] 茅献彪,陈占清,徐思朋,等.煤层冲击倾向性与含水率关系的试验研究[J].岩石力学与工程学报,2001,20(1): 49-52.
MAO Xianbiao, CHEN Zhanqing,XU Sipeng, et al. Experimental study on the relation between the burst tendency and water content in coal seam[J]. Chinese Journal of Rock Mechanics and Engineering, 2001, 20(1): 49-52.
[2] 孟召平,潘结南,刘亮亮,等.含水量对沉积岩力学性质及其冲击倾向性的影响[J].岩石力学与工程学报,2009, 28(增1): 2 637-2 643.
MENG Zhaoping, PAN Jienan, LIU Liangliang, et al. Influence of moisture contents on mechanical properties of sedimentary rock and its bursting potential[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S1): 2 637-2 643.
[3] 李宏艳.煤岩物理力学性质与冲击倾向性关系[J].煤矿开采,2011,16(3): 43-46.
LI Hongyan. Physical and mechanical property of coal and rock and its relationship with rockburst liability[J]. Coal Mining Technology, 2011, 16(3): 43-46.
[4] 刘忠锋,康天合,鲁伟,等.煤层注水对煤体力学特性影响的试验[J].煤炭科学技术,2010,38(1): 17-19.
LIU Zhongfeng, KANG Tianhe,LU Wei, et al. Experiment on water injection affected on mechanics features of coal body[J]. Coal Science and Technology, 2010, 38(1): 17-19.
[5] 苏承东,翟新献,魏向志,等.饱水时间对千秋煤矿2#煤层冲击倾向性指标的影响[J].岩石力学与工程学报,2014,33(2): 238-241.
SU CHENGdong, ZHAI Xinxian, WEI Xiangzhi, et al. Influence of saturation period on bursting liability indices for coal seam #2 in Qianqiu coal mine[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(2): 238-241.
[6] 侯艳娟,张顶立,郭富利.涌水隧道支护对围岩力学性质的影响[J].中南大学学报:自然科学版,2010, 41(3):1 152-1 157.
HOU Yanjuan, ZHANG Dingli, GUO Fuli.Influences of support on mechanical property of rock in water-containing tunnel[J]. Journal of Central South University: Science and Technology, 2010, 41(3): 1 152-1 157.
[7] 周瑞光,曲永新,成彬芳,等.山东龙口北皂煤矿软岩力学特性试验研究[J].工程地质学报,1996,4(4):55-60.
ZHOU Ruiguang, QU Yongxin, CHENG Binfang, et al. Mechanical properties of soft and weak rock in Longkou coal mine, Shandong[J]. Journal of Engineering Geology, 1996, 4(4): 55-60.
[8] 吴耀焜,王淑坤,张万斌.煤层注水预防冲击地压的机理探讨[J].煤炭学报,1989,14(2): 69-79.
WU Yaokun, WANG Shukun, ZHANG Wanbin. Analysis on water affected to mechanical property and acoustic-electricity characteristics of coal sample[J]. Journal of China Coal Socity, 1989, 14(2): 69-79.
[9] 熊德国,赵忠明,苏承东,等.饱水对煤系地层岩石力学性质影响的试验研究[J].岩石力学与工程学报, 2011, 30(5): 999-1 003.
XIONG Deguo, ZHAO Zhongming, SU CHENGdong, et al. Experimental study of effect of water-saturated state on mechanical properties of rock in coal measure strata[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(5): 999-1 003.
[10] 肖晓春,朱洪伟,潘一山,等.瓦斯煤岩变形破裂过程声发射预警信号变化规律研究[J].中国安全科学学报,2013,23(6): 122-127.
XIAO Xiaochun, ZHU Hongwei, PAN Yishan, et al. Acoustic emission warning singals change law research during deformation and failure of gassy coal rock[J]. China Safety Science Journal, 2013, 23(6): 122-127.
[11] 肖晓春,金晨,潘一山,等.组合煤岩破裂声发射特性和冲击倾向性试验研究[J].中国安全科学学报,2016,26(4): 103-107.
XIAO Xiaochun, JIN Chen, PAN Yishan, et al. Experimental study on acoustic emission characteristic and outburst-proneness of coal-rock combinations during failure process[J]. China Safety Science Journal, 2016, 26(4): 103-107.
[12] 肖晓春,潘一山,吕祥锋,等.含水煤岩变形破坏过程中瓦斯运移规律的实验研究[J].煤炭学报,2012,37(增1): 123-126.
XIAO Xiaochun, PAN Yishan, LYU Xiangfeng, et al. Experimental research on gas flow law of containing water coal specimens in deformation and fracture process [J]. Journal of China Coal Society, 2012, 37(S1): 123-126.
[13] 李庶林,尹贤刚,王泳嘉,等.单轴受压岩石破坏全过程声发射特征研究[J].岩石力学与工程学报,2004,23(15):2 499-2 503.
LI Shulin, YIN Xiangang, WANG Yongjia, et al. Study on acoustic emission characteristics of uniaxial compressive rock failure[J].Chinese Journal of Rock Mechanics and Engineering, 2004, 23(15): 2 499-2 503.
[14] 曹树刚,刘延保,张立强.突出煤体变形破坏声发射特征的综合分析[J].岩石力学与工程学报,2007,26(增1):2 794-2 799.
CAO Shugang, LIU Yanbao, ZHANG Liqiang.Study on characteristics of acoustic emission in outburst coal[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(S1):2 794-2 799.
[15] 肖晓春,丁鑫,潘一山,等.颗粒煤岩破裂过程声发射与电荷感应试验[J].煤炭学报,2015,40(8): 1 796-1 804.
XIAO Xiaochun, DING Xin, PAN Yishan, et al. Experiment of acoustic emission and charge induction in granular coal rock failure[J]. Journal of China Coal Society, 2015, 40(8): 1 796-1 804.
[16] 罗浩,潘一山,赵扬峰,等.含瓦斯煤体加卸载破坏前兆信息试验研究[J].煤炭学报,2015,40(3): 548-554.
LUO Hao, PAN Yishan, ZHAO Yangfeng, et al. Experimental study on acousto-charge precursory information of coal containing gas during loading failure process[J]. Journal of China Coal Society, 2015,40(3):548－554.
[17] 肖晓春,罗浩,潘一山,等.深井动力灾害电荷感应监测系统开发与应用[J].中国安全科学学报,2014,24(3): 97-102.
XIAO Xiaochun, LUO Hao, PAN Yishan, et al. Development and application of charge monitoring system of deep mine dynamic disaster[J]. China Safety Science Journal, 2014, 24(3): 97-102.
[18] 张艳博,黄晓红,李莎莎,等.含水砂岩在破坏过程中的频谱特性分析[J].岩土力学, 2013, 34(6): 1 574-1 578.
ZHANG Yanbo, HUANG Xiaohong, LI Shasha, et al. Spectral character analysis of sandstone under saturation condition in rupture procedure[J]. Rock and Soil Mechanics, 2013, 34(6): 1 574-1 578.
[19] VOZENESENSKII A S, ERTUGANOVA E A, VILYAMOV S V, et al. Studying the mechanism of acoustic emission in failure of rock salt by dissolving[J]. Journal of Mining Science, 2006, 42(1): 35-42.
[20] LAVROV A. The Kaiser effect in rocks: principles and stress estimation techniques[J]. International Journal of Rock Mechanics and Mining Sciences, 2003, 40(2): 151-171.
[21] CAI M, KAISER P K, MORIOKA H, et al. FLAC/PFC coupled numerical simulation of AE in large-scale underground excavations[J]. International Journal of Rock Mechanics and Mining Sciences, 2007, 44(4): 550-564.