Development and technical practice of liquid explosive based on deep-hole blasting problem

被引：0
|
作者：
Yang J. [1 ]
Yu B. [1 ,2 ]
Kuang T. [2 ]
Liu C. [1 ]
Li W. [2 ]
机构：
[1] School of Mines, China University of Mining & Technology, Xuzhou
[2] Datong Coal Mine Group Company, Datong
来源：
Meitan Xuebao/Journal of the China Coal Society | 2021年 / 46卷 / 06期
关键词：
Blasting pre-splitting; Directional blasting; Hard roof; Jet blast tube; Liquid explosive; Pressure relief through roof cutting;
D O I：
10.13225/j.cnki.jccs.2020.0438
中图分类号：
学科分类号：
摘要：
Aiming at the technical problems in deep-hole blasting technology, and the high explosive power at the moment of explosion, but the limited range of fracturing and insufficient rock breaking energy, a deep-hole explosive fracturing technology of liquid explosive was proposed. Based on the superior fluidity of liquid explosive and its small critical initiation diameter, and the components of water glue explosive of third safety level in coal mine, a water glue liquid explosive formulation for coal mine was developed, which has stable performance, low sensitivity and fluid physical form, solves the problem of large-angle and deep-hole charging, and provides condition for single-hole repeated blasting, through removing the gelling agent and crosslinking agent from the components of water glue explosive, and changing the proportion of the methylamine nitrate, ammonium nitrate and sodium nitrate etc. Research shows that the crystallization temperature of liquid explosive is controlled at 15.0-16.9 ℃, which is suitable for the temperature environment of coal mine. The sodium nitrite chemical foaming method is adopted to adjust the density of liquid explosive to 1.2 g/cm3. The average detonation velocity of the liquid explosive is 3 852 m/s, and the explosive mechanical properties obtained based on these data have reached the coal mine safety explosive standard. Taking the deep hole blasting test of the No. 408 track roadway in Yungang Coal Mine of Datong Coal Mine Group as the background, the liquid explosive has stable performance, and can be detonated normally with detonating cord. Through deep hole blasting test on hard roof, the explosive power of liquid explosive, water glue explosive, and emulsion explosive are basically the same, and the liquid explosive meets the performance requirements of coal mine safety. The use of liquid explosive in conjunction with jet blast tube can truly couple the liquid explosive with tube, which makes the explosion shock wave accurately collide in the predetermined cutting direction, enhances the explosive energy utilization rate in fracture direction, and achieves the effect of large-spacing deep hole directional blasting of hard roof. © 2021, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：1874 / 1887
页数：13
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共 28 条
  • [1] KANG Hongpu, FENG Yanjun, Hydraulic fracturing technology and its applications in strata control in underground coal mines, Coal Science and Technology, 45, 1, pp. 1-9, (2017)
  • [2] HE Manchao, MA Xingen, NIU Fulong, Et al., Adaptability research and application of rapid gob-side entry retaining formed by roof cutting and pressure releasing with composite roof and medium thick coal seam, Chinese Journal of Rock Mechanics and Engineering, 37, 12, pp. 2641-2654, (2018)
  • [3] YANG Xiaojie, LIU Chenkang, JI Yuguo, Et al., Research on roof cutting and pressure releasing technology of directional fracture blasting in dynamic pressure roadway, Geotechnical and Geological Engineering, 10, 3, pp. 1-13, (2018)
  • [4] LI Zehua, DENG Peng, YANG Chunhe, Et al., Experimental study on mechanical properties and fracability evaluation of carbonate reservoirs, Journal of Guangxi University, 44, 5, pp. 1450-1460, (2019)
  • [5] LI Haitao, LUO Wei, JIANG Yusheng, Et al., Initiation and extension of gas-driven fracture during compound perforation, Explosion and Shock Waves, 34, 3, pp. 307-314, (2014)
  • [6] ZHU Weiyao, YUE Ming, LIU Junfeng, Et al., Research progress on tight oil exploration in China, Chinese Journal of Engineering, 41, 9, pp. 1103-1114, (2019)
  • [7] LI Decong, CHEN Li, LIN Songying, Et al., Advances in the technology of explosion in fractures used in low permeability reservoirs, Engineering Science, 12, 9, pp. 52-57, (2010)
  • [8] WU Yongzheng, KANG Hongpu, Pressure relief mechanism and experiment of directional hydraulic fracturing in reused coal pillar roadway, Journal of China Coal Society, 42, 5, pp. 1130-1137, (2017)
  • [9] JIANG Tingxue, WANG Haitao, BIAN Xiaobing, Et al., Volume fracturing technology for horizontal well and its application, Northwest Oil & Gas Exploration, 30, 3, pp. 1-11, (2018)
  • [10] ZHANG Hao, SHENG James, Optimization of horizontal well fracturing in shale gas reservoir based on stimulated reservoir volume, Journal of Petroleum Science and Engineering, 190, (2020)
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