Electromagnetic appearing characteristics of damage properties of coal under impact loading

被引：0
|
作者：
Wang J.-G. [1 ]
Zhang S. [1 ]
Xie B.-J. [2 ]
机构：
[1] College of Environment and Resources, Fuzhou University, Fuzhou
[2] Faculty of Resources and Safety Engineering, China University of Mining and Technology, Beijing
来源：
Zhang, Su (zhangsu88@126.com) | 1662年 / Chinese Society of Civil Engineering卷 / 39期
关键词：
Coal; Damage property; Electromagnetic; Impact loading;
D O I：
10.11779/CJGE201709014
中图分类号：
学科分类号：
摘要：
The electromagnetic technology is an important means for predicting coal or rock dynamic disasters. The relationship between characteristic of electromagnetic signals and degree of damage is the premise of accurate prediction. Through coal SHPB experiments and transient electromagnetic monitoring, the characteristics of electromagnetic signals (0~3 kHz) of coal are analyzed in the process of rupture. The damage properties are analyzed from the degree of crushing and rupture energy. Then the relationship between the characteristics of electromagnetic signals (amplitude, energy) and the properties of coal damage is studied. The results show that the laws of fractal dimension and eventual rupture degree are similar. The fractal dimension can be used to quantitatively evaluate the extent of fracture specimens. The electromagnetic signals have transient pulse characteristics, and last only a few microseconds. The amplitude and energy of signals increase with the fragmentation degree. They exhibit a good linear relationship. The characteristics of electromagnetic signals can be used to monitor the damage degree of coal. Owing to the presence of the defects of inherent uncertainty coal materials and the resonance damage phenomenon, the correlation between damage degree and rupture energy is weak. The research results are important to the evaluation of the damage degree and to the prediction of dynamic disasters of coal or rock by use of the characteristics of electromagnetic signals. © 2017, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
引用
收藏
页码：1662 / 1669
页数：7
相关论文
共 19 条
  • [1] Jiang F.-X., Shi X.-F., Wang C.-W., Et al., Mechanical mechanism of rock burst accidents in slice mining face under high pressure, Chinese Journal of Geotechnical Engineering, 37, 6, pp. 1123-1131, (2015)
  • [2] Yang W.-L., Jiang F.-X., Yang P., Et al., Mechanism of repeated rock bursts in extra-thick coal seam, Chinese Journal of Geotechnical Engineering, 37, 11, pp. 2045-2050, (2015)
  • [3] Yao J.-M., Yan Y.-Y., Liu X.-Q., Et al., Study of EME rules during coal or rock mass failure base on energy theory, Rock and Soil Mechanics, 33, 1, pp. 233-242, (2012)
  • [4] Hu S.-B., Wang E.-Y., Li Z.-H., Et al., Nonlinear dynamic characteristics of electromagnetic radiation during loading coal, Journal of China University of Mining and Technology, 43, 3, pp. 380-387, (2014)
  • [5] He X.-Q., Dou L.-M., Mu Z.-L., Et al., Continuous monitoring and warning theory and technology of rockburst dynamic disaster of coal, Journal of China Coal Society, 39, 8, pp. 1485-1491, (2014)
  • [6] Ren X.-K., Wang E.-Y., Li Z.-H., Experimental study of characteristics of surface potential and electromagnetic radiation of pre-cracked rock plate during fracture, Journal of China University of Mining & Technology, 45, 3, pp. 440-446, (2016)
  • [7] Kong B., Wang E.Y., Li Z.H., Et al., Electromagnetic radiation characteristics and mechanical properties of deformed and fractured sandstone after high temperature treatment, Engineering Geology, 209, pp. 82-92, (2016)
  • [8] Yao J.-M., Dong W.-S., Yan Y.-Y., Et al., Multi-fractal characteristics of electromagnetic radiation with loaded coal, Journal of China Coal Society, 41, 6, pp. 1429-1433, (2016)
  • [9] Song D.Z., Wang E.Y., Song X.Y., Et al., Changes in frequency of electromagnetic radiation from loaded coal rock, Rock Mech Rock Eng, 49, pp. 291-302, (2016)
  • [10] Liu X.-H., Zhang R., Liu J.-F., Dynamic test study of coal rock under different strain rates, Journal of China Coal Society, 37, 9, pp. 1528-1534, (2012)
12