浅埋深易自燃煤层沿空留巷采空区自燃三带分布特征

doi:10.16265/j.cnki.issn1003-3033.2024.S1.0181

摘要/Abstract

摘要：

为厘清浅埋深、易自燃煤层沿空留巷采空区自燃“三带”分布特征,通过预埋高压胶管、高强度钢管防护测温光纤和监测束管的方式,动态监测沿空留巷采空区氧气和温度变化特征,借助数值模拟软件,判定采空区自燃“三带”分布范围。结果表明:31116沿空留巷采空区架间测点氧气浓度随工作面推进整体呈下降趋势,回风巷测点氧气浓度受隅角漏风干扰出现局部反升趋势,基于光纤测温数据,温度变化不能作为锦界煤矿沿空留巷采空区自燃“三带”划分的依据,受风流运移和局部漏风影响,31116采空区氧气浓度回风侧略高于进风侧,最终得到31116采空区进风侧氧化带范围为140.4~313.3 m,中部201.2~351.6 m,回风侧153.2~328.1 m,依据采空区遗煤量、地质特点等因素,综合判定工作面正常生产条件下最小推进速度为3.3 m/d。

关键词: 沿空留巷, 采空区遗煤, “三带”分布, 氧气浓度, 数值模拟

Abstract:

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.

Key words: gob-side entry retaining, residual coal in goaf area, distribution of three zones, oxygen concentration, numerical simulation

中图分类号:

X936

尚存久, 杨腾龙, 张有刚, 王帅锋. 浅埋深易自燃煤层沿空留巷采空区自燃三带分布特征[J]. 中国安全科学学报, 2024, 34(S1): 185-190.

SHANG Cunjiu, YANG Tenglong, ZHANG Yougang, WANG Shuaifeng. 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.

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采空区位置	散热带/m	氧化带/m	窒息带/m
进风侧	0~140.4	140.4~313.3	313.3~∞
采空区中部	0~201.2	201.2~351.6	351.6~∞
回风侧	0~153.2	153.2~328.1	328.1~∞