Development of a portable coal rock charge monitoring instrument and its application for rockburst control

Abstract

Effective monitoring techniques and equipment are essential for the prevention and control of coal and rock dynamic disasters such as rockburst. Based on the fact that there is charge generation during deformation and rupture of coal rock body and the charge signals contain a large amount of information about the mechanical process of deformation and rupture of coal rock, the rockburst charge sensing monitoring technology has been formed. In order to improve the charge sensing technology for monitoring and early warning of rockburst disasters, this paper develops a new generation of portable coal rock charge monitoring instrument on the basis of the original instrument and carries out laboratory and underground field application. The primary advancement involves enhancing the external structure of the sensor and increasing the charge sensing area, which can more comprehensively capture the charge signals from the loaded rupture of the coal rock body. The overall structure of the data acquisition instrument has been improved, the monitoring channels have been increased, and the function of displaying the monitoring data curve has been added, so that the coal and rock body force status can be grasped in time. The results of the experimental study show that the abnormal charge signals can be monitored during the rupture process of rock samples under loading, and the monitored charge signals are in good agreement with the sudden change of stress in the rock samples and the formation of crack extension. There is a precursor charge signal before the stress mutation, and the larger the loading rate is, the earlier the precursor charge signal appears. The charge monitoring instrument can monitor the charge signal of the coal seam roadway under strong mining pressure. In the zone of elevated overburden pressure, the amount of induced charge is large, and anomalously high value charge signals can be monitored when a coal shot occurs. The change trend of the charge at different measuring points of strike and inclination has a good consistency with the distribution of overrunning support pressure and lateral support pressure, which can reflect the stress distribution and the degree of stress concentration of the coal body through the size and location of the charge, foster early warning and analysis of rockburst, and provide target guidance for the prevention and control of rockburst.

Keywords

Rockburst / Charge monitoring instrument / Man-machine dialogue / Stress distribution / Monitor

CRediT authorship contribution statement

Gang Wang: Writing - review & editing, Writing - original draft, Funding acquisition, Conceptualization. Hongrui Zhao: Methodology, Formal analysis, Data curation. Lianpeng Dai: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing - original draft, Writing - review & editing. Haojun Wang: Software, Investigation, Data curation. Jinguo Lyu: Supervision, Investigation, Data curation. Jianzhuo Zhang: Visualization, Validation, Resources.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

The authors would like to thank the anonymous reviewers for their valuable and constructive comments. The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (Grant no.52304219; 52374201) and the Liaoning Provincial Science and Technology Plan Project (Grant no. 2022-BS-117) and Open Project of Liaoning Technical University Liaoning Province Key Laboratory of Mining Environment and Disaster Mechanics (Grant no. MEDM2023-B-5).

References

[1] P. Konicek, J. Ptacek, P. Waclawik, et al., Long-term Czech experiences with rockbursts with applicability to today's underground coal mines, Rock Mech. Rock Eng. 52 (5) (2019) 1447-1458, https://doi.org/10.1007/s00603-018-1489-y.

[2] A.T. Iannacchione, S.C. Tadolini, Occurrence, predication, and control of coal burst events in the U.S, Int. J. Min. Sci. Technol. 26 (1) (2015) 39-46, https://doi.org/ 10.1016/j.ijmst.2015.11.008.

[3] G.F. Wang, Y.S. Pan, S.K. Zhao, et al., How to realize safe, efficient and intelligent mining of rock burst coal seam, Coal Sci. Technol. 52 (1) (2024) 1-14, in Chinese)

[4] Y.S. Pan, A.W. Wang, Disturbance response instability theory of rock bursts in coal mines and its application, Geohazard Mechanics 1 (2022) 41-57, https://doi.org/ 10.1016/j.ghm.2022.12.002.

[5] E.Y. Wang, X.P. Liu, X.Q. He, et al., Acoustic emission and electromagnetic radiation synchronized monitoring technology and early-warning application for coal and rock dynamic disaster[J], vol. 47, Journal of China University of Mining & Technology, 2018, pp. 953-959, https://doi.org/10.13247/j.cnki.jcumt.000849 (in Chinese).

[6] J.W. Archer, M.R. Aydin, A. Dobbs, H.J. Reeves, Measurement and correlation of acoustic emissions and pressure stimulated volt-ages in rock using an electric potential sensor, Int. J. Rock Mech. Min. Sci. 89 (2016) 26-33, https://doi.org/ 10.1016/j.ijrmms.2016.08.002.

[7] V. Rudajev, J. Vilhelm, T. Lokajicek, Laboratory studies of acoustic emission prior to uniaxial compressive rock failure, Int. J. Rock Mech. Min. Sci. 37 (4) (2000) 699-704, https://doi.org/10.1016/S1365-1609(99)00126-4.

[8] U. Nitsan, Electromagnetic emission accompanying fracture of quartz-bearing rocks, Geophysics Research letters 4 (8) (1977) 333-336, https://doi.org/10.1029/ GL004i008p00333.

[9] E.Y. Wang, Z.H. Li, Z.T. Liu, et al., Experimental study on surface potential effect of coal under load, Chin. J. Geophys. 52 (5) (2009) 1318-1325, https://doi.org/ 10.3969/j.issn.0001-5722.2009.05.021 (in Chinese).

[10] G.O. Cress, B.T. Brady, G.A. Rowell, Sources of electromagnetic radiation from fracture of rock samples in laboratory, Geophys. Res. Lett. 14 (4) (1987) 331-334, https://doi.org/10.1029/GL014i004p00331.

[11] A.Y. Cao, F. Chen, Y.Q. Liu, et al., Response characteristics of rupture mechanism and source parameters of mining tremors in frequent coal burst area, J. China Coal Soc. 47 (2) (2022) 722-733, https://doi.org/10.13225/j.cnki.jccs.xr21.1880 (in Chinese).

[12] C.P. Lu, L.M. Dou, H. Liu, et al., Case study on micro seismic effect of coal and gas outburst process, Int. J. Rock Mech. Min. Sci. 53 (7) (2012) 101-110, https:// doi.org/10.1016/j.ijrmms.2012.05.009.

[13] Kirikaev, Electric field of rock under force loading, in:Xu Yufeng, Translation, Earthquake Press, Beijing, 1993.

[14] V.S. Kuksenko, K.F. Makhmudov, A.V. Ponomarev, Relaxation of electric fields induced by mechanical loading in natural dielectrics, Phys. Solid State 39 (7) (1997) 1065-1066, https://doi.org/10.1134/1.1130015.

[15] D. Triantis, C. Anastasiadis, I. Stavrakas, The correlation of electrical charge with strain on stressed rock samples, Nat. Hazards Earth Syst. Sci. 8 (6) (2008) 1243-1248, https://doi.org/10.5194/nhess-8-1243-2008.

[16] I. Stavrakas, C. Anastasiadis, D. Triantis, F. Vallianatos, Piezo stimulated currents in marble samples: precursory and concurrent-with-failure signals, Nat. Hazards Earth Syst. 3 (2003) 243-247, https://doi.org/10.5194/nhess-3-243-2003.

[17] F. Vallianatos, D. Triantis, A. Tzanis, C. Anastasiadis, I. Stavrakas, Electric earthquake precursors: from laboratory results to field observations, Phys. Chem. Earth 29 (2004) 339-351, https://doi.org/10.1016/j.pce.2003.12.003.

[18] Z. Tang, Y.S. Pan, Z.H. Li, et al., Charge induction mechanism in the process of fracture of coal-rock, Chin. J. Geotech. Eng. 35 (6) (2013) 1156-1160, in Chinese)

[19] Y.S. Pan, H. Luo, Y.F. Zhao, Application of charge induction monitoring technology of mine dynamic disasters, Coal Sci. Technol. 41 (9) (2013) 29-33t78, https:// doi.org/10.13199/j.cnki.cst.2013.09.010 (in Chinese).

[20] Y.S. Pan, Y.F. Zhao, G.Z. Li, Charge-induced technique of rockburst prediction and its application, Chin. J. Rock Mech. Eng. 31 (S2) (2012) 3988-3993, https:// doi.org/10.13199/j.cnki.cst.2013.09.01 (in Chinese).

[21] Y.S. Pan, H. Luo, Z. Tang, Z.H. Li, Y.F. Zhao, Study on the charge induction law of tensile instability damage of coal rock body, Journal of Rock Mechanics and Engineering 32 (7) (2013) 1297-1303.

[22] Y.S. Pan, L.M. Xu, G.Z. Li, et al., Characteristics of charge radiation of dynamic disasters in deep coal mine, Chin. J. Rock Mech. Eng. 33 (8) (2014) 1619-1625, May 2024). (in Chinese)

[23] H. Luo, Y.S. Pan, Y.F. Zhao, et al., Experimental research on mine dynamic disaster prediction based on charge monitoring technique, China Saf. Sci. J. 22 (8) (2012) 98-103, https://doi.org/10.16265/j.cnki.issn1003-3033.2012.08.021 (in Chinese).

[24] Y.F. Zhao, Study on the charge induction rules during deformation and fracture of coal or rock[D], in:Fuxin, Liaoning Technical University, 2010, https://www.kns.cnki.net. (Accessed 12 May 2024). (in Chinese)

[25] Z. Tang, Y.S. Pan, Z.H. Li, et al., Application of charge detection of coal-rock in the dynamic disaster prediction, Chin. J. Geol. Hazard Control 21 (3) (2010) 109-112, https://doi.org/10.16031/j.cnki.issn.1003-8035.2010.03.012 (in Chinese).

[26] H. Luo, Study on the law of electric charge induction in gassy coal-rock failure process and its application[D] Fuxin, Liaoning Technical University, 2016, https:// doi.org/10.27210/d.cnki.glnju.2016.000089 (in Chinese).

[27] G. Wang, S.Q. Gao, A.W. Wang, et al., Research on charge induction law and application of coal samples with different fissures, Sci. Rep. 13 (2023) 15653, https://doi.org/10.1038/s41598-023-42100-6.