Study on the Reasonable Number of Demolished Pre-Drainage Boreholes Drilled along Coal Seams

Jump To References Section

Authors

  • Junxiang Zhang
     School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454 000 ,CN
  • Bo Li
     College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454 000 ,CN

Keywords:

Demolished Pre-Drilled Boreholes, Advance Rate, Drainage Radius, Pressure-Relief Range, Gas Extraction.

Abstract

In order to determine the reasonable number of demolished pre-drainage boreholes drilled along coal seams, against the backdrop of actual coal mines, the paper considered the comprehensive impact of pressure-relief ranges of the coal seams in front of the mining face, the advance rate of the working face, and drainage radius on the number of demolished pre-drainage boreholes. By means of numerical simulation and engineering verification, the paper determined the pressure-relief range of the coal seams in front of the mining face as 8.0m. Based on in situ mining progress and the relative production program, on the premise that the advance rate of the mining face remained constant, the paper analyzed the number of boreholes to demolish in front of the mining face at different gas predrainage time. The result showed that: when the gas predrainage time was defined as 30d, 60d and 90d, respectively, and the daily advancing distance of the working face was set as 3.6m at the same time, the number of boreholes to demolish was calculated to be 3, 3 and 2, respectively. This research result may act as a guidance to the reasonable deployment of mining programs in the coal mine, and may coordinate underground mining and gas extraction. It can also help realize coal seam outburst elimination and safety production to the greatest extent at the same time when economic benefits are maintained.

Downloads

Download data is not yet available.

Downloads

Published

2022-10-19

How to Cite

Zhang, J., & Li, B. (2022). Study on the Reasonable Number of Demolished Pre-Drainage Boreholes Drilled along Coal Seams. Journal of Mines, Metals and Fuels, 64(12), 625–630. Retrieved from http://informaticsjournals.com/index.php/jmmf/article/view/31626

Issue

Volume 64, Issue 12, December 2016

Section

Articles

License

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

References

Xie, H. P., Zhou, H. W., Xue, D. J., Zhou, H. W., Zhang, R. and Gao, F. (2012): “Research and consideration on deep coal mining and critical mining depth.” Journal of China Coal Society, 37(4): 535-542.

Hou, Q. T. (2002): “Research on the technology of protecting efficiently coal and gas from gushing.” Journal of Huainan Institute of Technology, 22(4): 11-14.

Liang, B., Yuan, X. P., Sun, W. J., Wang, Y. and Zhao, H. B. (2013): “Grouped pressure test to determine effective gas drainage radius.” Journal of Mining & Safety Engineering, 30(1): 132-135.

Li, S. W., Zhang, Z. F. and Xuan, D. Q. (2014): “Determination on effective influence radius of inseam borehole based on gas drainage flow method.” Coal Science and Technology, 42(4): 43-45.

Zheng, L. (2015): “Determination of the gas drainage radius of low permeability and high gas coal seam by SF6 gas tracer.” Coal Geology & Exploration, 43(3): 122-124.

Si, H., Tao, G. and Li, X. H. (2011): “Analysis and numerical simulation of fluid-structure coupling of gas drainage from boreholes.” Journal of Chongqing University, 34(11): 105-110.

Wang, H. T., Jiang, J. J., Wang, Z. Q., Zhong, H. G. and Yuan, Z. G. (2011): “Numerical simulation of seepage field of gas extraction drilling of single bedding of mining-coal bed.” Journal of Chongqing University, 34(4): 24-29.

Wu, Y. Z., Meng, L. and Jiang, Y. D. (2015): “Study on the gas flowing model containing diffusion and seepage to determine gas drainage radius.” China Mining Magazine, 24(1): 100-103.

Yin, G. Z., Li, X. S., Wei, Z. A., Li, Y. J. and Wang, Q. S. (2011): “Similar simulation study of deformation and failure response features of slope and stope rocks.” Chinese Journal of Rock Mechanics and Engineering, 30(s1): 2914-2922.

Li, B. (2013): Seepage characteristics of loaded coal containing gas and its application. Ph.D. dissertation, Dept. College of Resources & Safety Engineering, CUMTB. Univ., Beijing, China.

Wang, K., Zheng, J. Y., Xia, W., Li, P. and Li, C. (2014): “Application and study on permeability improvement effect by pressure relief in mining-induced coal body.” Coal Science and Technology, 42(6): 65-70.