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Study on explosion overpressure and deflagration-to-detonation transition characteristics of shale gas in fractures
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Hao SHAO1, 2, Yi CAI1, 2, Tao YANG3, **, Zhengyan WU1, 2, Huan HU1, 2, Zhiyuan YAO1, 2
China Safety Science Journal | 2025, 35(4) : 51 - 58
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China Safety Science Journal | 2025, 35(4): 51-58
• Safety engineering technology •
Study on explosion overpressure and deflagration-to-detonation transition characteristics of shale gas in fractures
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Hao SHAO1, 2, Yi CAI1, 2, Tao YANG3, **, Zhengyan WU1, 2, Huan HU1, 2, Zhiyuan YAO1, 2
Affiliations
  • 1 School of Safety Science Engineering Management，China University of Mining and Technology，Xuzhou Jiangsu 221116，China
  • 2 National Engineering Research Center for Coal Mine Gas Control，China University of Mining and Technology，Xuzhou Jiangsu 221116，China
  • 3 School of Mining Safety，North China Institute of Science and Technology，Langfang Hebei 065201，China
Published: 2025-04-28 doi: 10.16265/j.cnki.issn1003-3033.2025.04.1040
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To investigate the methane DDT distance and maximum explosion pressure (Pmax) in shale fractures，a multi-scale adjustable 3D planar slit detonation system was developed. Experiments with methane-oxygen premixed gas under 4 different hydraulic diameters，along with numerical simulations，were conducted to examine shale gas combustion under high pressure. Results show that methane-oxygen premixed gas can sustain self-propagating explosion within a hydraulic diameter range of 1.9 to 11.43 mm. Both Pmax and peak pressure rise rate increase linearly with initial pressure. Under a hydraulic diameter of 11.43 mm，Pmax closely approaches theoretical detonation pressure. As the hydraulic diameter decreases，the Pmax-to-initial pressure ratio decreases. The initial pressure and the DDT distance follow a power-law relationship. Increasing the initial pressure or reducing the hydraulic diameter can shorten the DDT distance，thereby accelerating the DDT. The simulation shows that methane-oxygen premixed gas explosions can produce an overpressure of 330 MPa，capable of fully fracturing rock cracks.

shale gas  /  methane  /  fractures  /  explosion  /  deflagration-to-detonation transition (DDT)
Hao SHAO, Yi CAI, Tao YANG, Zhengyan WU, Huan HU, Zhiyuan YAO. Study on explosion overpressure and deflagration-to-detonation transition characteristics of shale gas in fractures[J]. China Safety Science Journal, 2025 , 35 (4) : 51 -58 . DOI: 10.16265/j.cnki.issn1003-3033.2025.04.1040
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Year 2025 volume 35 Issue 4
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doi: 10.16265/j.cnki.issn1003-3033.2025.04.1040
  • Receive Date：2024-12-05
  • Online Date：2025-07-05
  • Published：2025-04-28
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  • Received：2024-12-05
  • Revised：2025-02-27
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Affiliations
    1 School of Safety Science Engineering Management，China University of Mining and Technology，Xuzhou Jiangsu 221116，China
    2 National Engineering Research Center for Coal Mine Gas Control，China University of Mining and Technology，Xuzhou Jiangsu 221116，China
    3 School of Mining Safety，North China Institute of Science and Technology，Langfang Hebei 065201，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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