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Division of spontaneous combustion risk zones in coal mine gob areas using gas kernel density distribution
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Qing GUO1, Wanxing REN**, 2, Shengcheng WANG1, Hao WANG3
China Safety Science Journal | 2025, 35(12) : 96 - 102
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China Safety Science Journal | 2025, 35(12): 96-102
• Safety engineering technology •
Division of spontaneous combustion risk zones in coal mine gob areas using gas kernel density distribution
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Qing GUO1, Wanxing REN**, 2, Shengcheng WANG1, Hao WANG3
Affiliations
  • 1School of Civil Engineering, Xuzhou University of Technology, Xuzhou Jiangsu 221018, China
  • 2School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
  • 3College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 200135, China
Published: 2025-12-28 doi: 10.16265/j.cnki.issn1003-3033.2025.12.1445
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To prevent coal spontaneous combustion disasters in the gob area and precisely delineate hazardous zones, the variation patterns of CO and O2 volume fractions along the gob length were statistically analyzed based on field measurements. Critical warning threshold ranges for spontaneous combustion were established and a gob hazard zoning method based on gas volume fraction kernel density was proposed. The results demonstrate that O2 volume fraction exhibits a linear variation with distinct stages, and the variation rate before the inflection point is lower than that after the point. The CO volume fraction follows a quadratic polynomial variation. The kernel densities of both CO and O2 volume fractions decrease with increasing gob length. Their highest kernel density distributions occur within 0-10m and 0-30m, respectively. O2 volume fraction is more stable before the inflection point but exhibits greater fluctuation afterward. The average upper and lower acceptable limits for O2 volume fraction before and after the inflection point are 3.3% and 6.3%, respectively. The critical CO and O2 volume fraction values for hazard zoning based on kernel density are 0.009% and 15.1%, which divides the gob area into four quadrants and three risk levels (safe, potentially hazardous, and hazardous).

coal spontaneous combustion  /  gob hazardous zone  /  coal fire early warning  /  kernel density  /  statistical characteristics
Qing GUO, Wanxing REN, Shengcheng WANG, Hao WANG. Division of spontaneous combustion risk zones in coal mine gob areas using gas kernel density distribution[J]. China Safety Science Journal, 2025 , 35 (12) : 96 -102 . DOI: 10.16265/j.cnki.issn1003-3033.2025.12.1445
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Year 2025 volume 35 Issue 12
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doi: 10.16265/j.cnki.issn1003-3033.2025.12.1445
  • Receive Date：2025-05-21
  • Online Date：2026-07-09
  • Published：2025-12-28
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  • Received：2025-05-21
  • Revised：2025-08-05
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Affiliations
    1School of Civil Engineering, Xuzhou University of Technology, Xuzhou Jiangsu 221018, China
    2School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
    3College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 200135, 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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