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Distribution characteristics of three zones of spontaneous combustion in goaf area of gob-side entry retaining in shallowly buried and easily spontaneous combustion coal seam
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Cunjiu SHANG, Tenglong YANG, Yougang ZHANG, Shuaifeng WANG
China Safety Science Journal | 2024, 34(S1) : 185 - 190
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China Safety Science Journal | 2024, 34(S1): 185-190
Safety engineering technology
Distribution characteristics of three zones of spontaneous combustion in goaf area of gob-side entry retaining in shallowly buried and easily spontaneous combustion coal seam
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Cunjiu SHANG, Tenglong YANG, Yougang ZHANG, Shuaifeng WANG
Affiliations
  • Jinjie Coal Mine,Guoneng Shendong Coal Group Co.,Ltd.,Shenmu Shaanxi 719315,China
Published: 2024-06-30 doi: 10.16265/j.cnki.issn1003-3033.2024.S1.0181
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In order to study the distribution characteristics of the three zones of spontaneous combustion in the goaf area of the gob-side entry retaining in the shallowly buried and easily spontaneous combustion coal seam,the variation laws of oxygen and temperature in the goaf area of the gob-side entry retaining were dynamically monitored by embedding high-pressure rubber hoses,high-strength steel pipe-protected optical fibers for temperature measurement,and monitoring beam tubes. With the help of numerical simulation software,the distribution range of the three zones of spontaneous combustion in the goaf area was determined. The results show that the oxygen concentration at the measurement points between the supports in the goaf area of the 31116 gob-side entry retaining shows an overall downward trend with the advancement of the working face,and the oxygen concentration at the measurement points in the return air channel is locally reversed due to the interference of air leakage at the corner. Based on the temperature measurement data of optical fibers,the temperature change cannot be used as the basis for the division of the three zones of spontaneous combustion in the goaf area of the gob-side entry retaining in Jinjie Coal Mine. Affected by the airflow migration and local air leakage,the oxygen concentration in the goaf area of the 31116 is slightly higher on the return air side than on the intake air side. Finally,it is obtained that the oxidation zone range on the intake air side of the 31116 is 140.4-313.3 m. In the middle part,the range is 201.2-351.6 m,and on the return air side,it is 153.2-328.1 m. According to factors such as the amount of residual coal in the goaf area and geological characteristics,it is comprehensively determined that the minimum advancing speed under normal production conditions of the working face is 3.3 m/d.

gob-side entry retaining  /  residual coal in goaf area  /  distribution of three zones  /  oxygen concentration  /  numerical simulation
Cunjiu SHANG, Tenglong YANG, Yougang ZHANG, Shuaifeng WANG. Distribution characteristics of three zones of spontaneous combustion in goaf area of gob-side entry retaining in shallowly buried and easily spontaneous combustion coal seam[J]. China Safety Science Journal, 2024 , 34 (S1) : 185 -190 . DOI: 10.16265/j.cnki.issn1003-3033.2024.S1.0181
Year 2024 volume 34 Issue S1
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2024.S1.0181
  • Receive Date:2024-03-14
  • Online Date:2025-07-09
  • Published:2024-06-30
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  • Received:2024-03-14
  • Revised:2024-05-17
Affiliations
    Jinjie Coal Mine,Guoneng Shendong Coal Group Co.,Ltd.,Shenmu Shaanxi 719315,China
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表12种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

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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