Study on propagation characteristics of ultrasonic wave in coal

doi:10.16265/j.cnki.issn1003-3033.2017.12.012

Abstract

Abstract: In order to predict and control coal and rock dynamic disasters better, coal samples of Gengcun coal mine of Yima coal company in Henan province were studied by using an ultrasonic comprehensive test instrument for testing, and the propagation characteristics of ultrasonic wave in coal samples were studied by ANSYS numerical simulation method. The influence of the length of coal sample on the amplitude of ultrasonic longitudinal wave was examined emphatically. The results show that the amplitude of ultrasonic wave is negatively correlated with the coal sample length, at the same ultrasonic frequency in a certain coal sample length range. But outside the range, the coal sample length has no effect on the ultrasonic wave amplitude, that when the ultrasonic frequency increases from 20 kHz to 1 MHz, the ultrasonic reliable detection distance will be shorted from 8.4 to 0.252 m.

Key words: ultrasonic wave, propagation characteristics, detection distance, first wave amplitude, numerical simulation

CLC Number:

X924.3

WANG Yungang, YANG Tingting, WANG Qiongyang, ZHANG Hongtu, XU Xiangyu. Study on propagation characteristics of ultrasonic wave in coal[J]. China Safety Science Journal, 2017, 27(12): 68-73.

References

[1] 成林,王赟,张玉贵,等.煤岩声波特征研究现状及展望[J]. 地球物理学进展, 2013, 28(1) : 452-461.
CHENG Lin, WANG Yun, ZHANG Yugui, et al. The present situation and prospect of the acoustic properties research in coal[J]. Progress in Geophysics, 2013, 28(1): 452-461.
[2] MCKENZIE C K, STACEY G P, GLADWIN M T. Ultrasonic characteristics of a rock mass[J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1982, 19(1): 25-30.
[3] DIPALEE M Kate, CHOUDHARI N K, CHOUDHARI A R. Measurement of velocity and attenuation of coal by using ultrasonic NDT[J].International Journal of Engineering Development and Research, 2016, 4(1): 449-452.
[4] 孟召平, 张吉昌, JOACHIM Tiedemann. 煤系岩石物理力学参数与声波速度之间的关系[J]. 地球物理学报, 2006, 49(5): 1 505-1 510.
MENG Zhaoping, ZHANG Jichang, JOACHIM Tiedemann. Relationship between physical and mechanical parameters and acoustic wave velocity of coal measures rocks[J]. Chinese Journal of Geophysics, 2006, 49(5): 1 505-1 510.
[5] 王赟, 许小凯, 张玉贵. 六种不同变质程度煤的纵横波速度特征及其与密度的关系[J]. 地球物理学报, 2012, 55(11): 3 754-3 761.
WANG Yun, XU Xiaokai, ZHANG Yugui. Characteristics of P-wave and S-wave velocities and their relationships with density of six metamorphic kinds of coals[J]. Chinese Journal of Geophysics, 2012, 55(11): 3 754-3 761.
[6] 王云刚, 李满贵, 李盟, 等. 构造煤超声波参数影响因素的分析[J]. 中国安全生产科学技术, 2014, 10(7): 82-86.
WANG Yungang, LI Mangui, LI Meng, et al. Tectonic coal ultrasonic parameters influencing factors analysis [J]. Journal of Safety Science and Technology, 2014, 10(7): 82-86.
[7] 李满贵. 煤体超声波速度影响因素的实验研究[D]. 焦作: 河南理工大学, 2015.
LI Mangui. Study on dynamics features of ultrasonic velocities in loading coal[D]. Jiaozuo: Henan Polytechnic University, 2015.
[8] 刘德志. 声波透射法准确判定桩身完整性的应用研究[D]. 兰州: 兰州交通大学, 2012.
LIU Dezhi. The applied research on pile integrity judgment with acoustic transmission method[D]. Lanzhou: Lanzhou Jiaotong University, 2014.
[9] 姜春晖. 基于有限元数值模拟的含缺陷介质弹性波传播特性分析[D]. 北京:中国科学院大学, 2016.
JIANG Chunhui. Medium containing defects based on the finite element numerical simulation of elastic wave propagation analysis [D]. Beijing:University of Chinese Academy of Sciences, 2016.
[10] 余涛. 超声波在混凝土中传播的数值模拟[D]. 长沙: 中南大学, 2013.
YU Tao. Numerical simulation of ultrasonic propagation in concrete [D]. Changsha: Central South University, 2013.
[11] 曹均, 贺振华, 黄德济, 等. 储层孔(裂)隙的物理模拟与超声波实验研究[J]. 地球物理学进展, 2004, 19(2): 386-391.
CAO Jun, HE Zhenhua, HUANG Deji, et al. Physical modeling and ultrasonic experiment of pore-crack in reservoirs[J]. Progress in Geophysics, 2004, 19(2): 386-391.
[12] 王云刚, 李满贵, 陈兵兵, 等. 干燥及饱和含水煤样超声波特征的实验研究[J]. 煤炭学报, 2015,40(10): 2 445-2 450.
WANG Yungang, LI Mangui, CHEN Bingbing, et al. Experimental study on ultrasonic wave characteristics of coal samples under dry and water saturated conditions[J]. Journal of China Coal Society, 2015, 40(10): 2 445-2 450.
[13] 王云刚, 巨广刚, 陈兵兵, 等.耦合剂对煤样超声波测试影响的实验研究[J].河南理工大学学报:自然科学版, 2016, 35(2): 173-177.
WANG Yungang, JU Guanggang, CHEN Bingbing, et al. Experimental study on the effect of coupling agent on ultrasonic testing of coal samples [J]. Journal of Henan Polytechnic University:Natural Science Edition, 2016, 35 (2): 173-177.
[14] LUDWING R, LORD W. Developments in the finite element modeling of ultrasonic NDT phenomena[M]. New York:Springer US, 1986: 73-81.
[15] ALLEYNE D, CAWLEY P. A two-dimensional Fourier transform method for measurement of propagating multimode signals[J].Journal of the Acoustical Society of America, 1991, 89 (3): 1 159-1 168.
[16] SARMA G S, MALLICK K, GADHINGLAJKAR V R. Nonreflecting boundary condition in finite-element formulation for elastic wave equation[J]. Society of Exploration Geophysicists, 1998, 63(3): 1 006-1 015.