Tomography method for adjacent channel frequency shift of transmitted in-Seam waves

Authors

TIAN Han, School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, ChinaFollow
WU Rongxin, School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Huainan 232001, China
HU Ze’an, School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Huainan 232001, ChinaFollow
YANG Qiaonan, School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China

Abstract

In-Seam Seismic is one of the main detection methods for small geological structures in the coal mining working face. In this method, the energy attenuation feature of in-seam waves is mainly utilized. In case of any significant geological anomaly or receivers coupling difference in coal working face, the energy distribution of the in-seam wave at different frequency bands will be significantly affected, and the stability and accuracy of in-seam wave detection results will be decreased. Using the centroid frequency change features of the in-seam wave signals for inversion imaging is an innovative, effective method. However, for this method, there are difficulties in eliminating diversity influence of seismic source. Therefore, the tomography method base on the adjacent in-seam frequency shift of transmitted in-seam waves, for the estimation of the relative variety of the centroid frequency, was proposed. On the basis of the theoretical analysis, the formula for calculating relative variation of the centroid frequency shift (M_i) based on the adjacent in-Seam transmitted channel waves was derived; the positive linear correlation between M_i and the propagation distance of in-seam wave was verified by two-dimensional numerical simulation; and the normal and new imaging results of field test signals were compared and analyzed. As demonstrated by the above experiment results, there is a frequency shift in in-seam wave signals, and the tomography method with the M_i value is effective. The above method overcomes the effects that are caused by the source difference and the improper artificial selection of source centroid frequency on imaging results, providing a new approach for the processing of in-seam wave data.

Keywords

in-seam seismic，centroid frequency，frequency shift，tomography

DOI

10.12363/issn.1001-1986.22.04.0221

Recommended Citation

TIAN Han, WU Rongxin, HU Ze’an, et al. (2022) "Tomography method for adjacent channel frequency shift of transmitted in-Seam waves," Coal Geology & Exploration: Vol. 50: Iss. 11, Article 20.
DOI: 10.12363/issn.1001-1986.22.04.0221
Available at: https://cge.researchcommons.org/journal/vol50/iss11/20

Reference

[1] 袁亮. 我国煤矿安全发展战略研究[J]. 中国煤炭,2021,47(6):1−6

YUAN Liang. Study on the development strategy of coal mine safety in China[J]. China Coal,2021,47(6):1−6

[2] 袁亮,张平松. 煤炭精准开采透明地质条件的重构与思考[J]. 煤炭学报,2020,45(7):2346−2356

YUAN Liang,ZHANG Pingsong. Framework and thinking of transparent geological conditions for precise mining of coal[J]. Journal of China Coal Society,2020,45(7):2346−2356

[3] 董书宁,刘再斌,程建远,等. 煤炭智能开采地质保障技术及展望[J]. 煤田地质与勘探,2021,49(1):21−31

DONG Shuning,LIU Zaibin,CHENG Jianyuan,et al. Technologies and prospect of geological guarantee for intelligent coal mining[J]. Coal Geology & Exploration,2021,49(1):21−31

[4] 杨辉. 反射槽波在阳煤和顺矿区小构造探查中的应用[J]. 煤田地质与勘探,2018,46(增刊1):37−40

YANG Hui. Application of reflected in–seam waves in detecting small structure in Heshun mining area of Yangquan Coal Group[J]. Coal Geology & Exploration,2018,46(Sup.1):37−40

[5] 李刚. 煤矿井下工作面内隐伏断层透射槽波探测技术[J]. 煤田地质与勘探,2016,44(5):142−145

LI Gang. Detection technique of transmission in–seam wave for concealed fault in working face of underground coal mine[J]. Coal Geology & Exploration,2016,44(5):142−145

[6] WANG Bo,LIU Shengdong,ZHOU Fubao,et al. Dispersion characteristics of SH transmitted channel waves and comparative study of dispersion analysis methods[J]. Journal of Computational and Theoretical Nanoscience,2016,13(2):1468−1474.

[7] 杨思通,程久龙. 煤巷小构造Rayleigh型槽波超前探测数值模拟[J]. 地球物理学报,2012,55(2):655−662

YANG Sitong,CHENG Jiulong. The method of small structure prediction ahead with Rayleigh channel wave in coal roadway and seismic wave field numerical simulation[J]. Chinese Journal of Geophysics (in Chinese),2012,55(2):655−662

[8] LEI Feng，WANG Wei，LI Songying，et al. Research on the channel wave field characters of goaf in coal mine and its application[M]. Springer Singapore，2017.

[9] 崔伟雄,王保利,王云宏. 基于透射槽波的工作面煤层厚度高精度反演方法[J]. 煤炭学报,2020,45(7):2482−2490

CUI Weixiong,WANG Baoli,WANG Yunhong. High–precision inversion method of coal seam thickness based on transmission channel wave[J]. Journal of China Coal Society,2020,45(7):2482−2490

[10] ZHU Mengbo,CHENG Jianyuan,CUI Weixiong,et al. Comprehensive prediction of coal seam thickness by using in–seam seismic surveys and Bayesian Kriging[J]. Acta Geophysica,2019,67:825−836.

[11] WANG Wei，XUE Guoqiang，GAO Xing，et al. Channel wave tomographic imaging method and its application in detection of collapse column in coal[C]// 2016 7^th International Conference on Environment and Engineering Geophysics & Summit Forum of Chinese Academy of Engineering on Engineering Science and Technology，2016.

[12] 王季,李刚,吴国庆,等. 采煤工作面地质异常体透射槽波探测技术[J]. 煤炭科学技术,2016,44(6):159−163

WANG Ji,LI Gang,WU Guoqing,et al. Transmitted channel wave detecting technology of geologic anomalous body in coal mining face[J]. Coal Science and Technology,2016,44(6):159−163

[13] 姬广忠,程建远,胡继武,等. 槽波衰减系数成像方法及其应用[J]. 煤炭学报,2014,39(增刊2):471−475

JI Guangzhong,CHENG Jianyuan,HU Jiwu,et al. In–seam wave imaging using attenuation coefficient:Method and application[J]. Journal of China Coal Society,2014,39(Sup.2):471−475

[14] 李松营,廉洁,滕吉文,等. 基于槽波透射法的采煤工作面煤厚解释技术[J]. 煤炭学报,2017,42(3):719−725

LI Songying,LIAN Jie,TENG Jiwen,et al. Interpretation technology of coal seam thickness in mining face by ISS transmission method[J]. Journal of China Coal Society,2017,42(3):719−725

[15] QUAN Youli,HARRIS J M. Seismic attenuation tomography using the frequency shift method[J]. Geophysics,1997,62(3):895−905.

[16] HU Z A，CAO L K，WU R X，et al. Article：Estimation method of coal channel Q value based on frequency shift phenomenon of transmitting channel wave[J]. Exploration Geophysics，2022. doi: https://doi.org/10.1080/08123985.2022.2054323.

[17] BUCHANAN D J. The propagation of attenuated SH channel waves[J]. Geophysical Prospecting,1978,26(1):16−28.

[18] YANG Sitong,WEI Jiuchuan,CHENG Jiulong,et al. Numerical simulations of full–wave fields and analysis of channel wave characteristics in 3–D coal mine roadway models[J]. Applied Geophysics,2016,13(4):621−630.

[19] LI Hui,ZHU Peimin,JI Guangzhong,et al. Modified image algorithm to simulate seismic channel waves in 3D tunnel model with rugged free surfaces[J]. Geophysical Prospecting,2016,64(5):1259−1274.

[20] LUXBACHER K,WESTMAN E,SWANSON P,et al. Three–dimensional time–lapse velocity tomography of an underground longwall panel[J]. International Journal of Rock Mechanics and Mining Sciences,2008,45(4):478−485.