放顶煤工作面立体自燃带动态变化特性研究

doi:10.16265/j.cnki.issn1003-3033.2022.03.009

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (3): 65-74.doi: 10.16265/j.cnki.issn1003-3033.2022.03.009

放顶煤工作面立体自燃带动态变化特性研究

赵文彬¹(), 刘方顺¹, 石新岩¹, 刘辉², 王忠密³, 李振武⁴

¹山东科技大学安全与环境工程学院,山东青岛 266590
²山东东山古城煤矿有限公司, 山东济宁 272100
³山东东山王楼煤矿有限公司,山东济宁 272100
⁴山东济宁能源发展集团,山东济宁 272073

收稿日期:2021-12-11 修回日期:2022-02-18 出版日期:2022-08-23 发布日期:2022-09-28
作者简介:
赵文彬 (1976—),男,山东泰安人,博士,副教授,主要从事矿井“一通三防”技术等方面的研究。E-mail: zhwb1976@163.com。
赵文彬副教授
基金资助:
国家自然科学基金资助(51974179); 国家自然科学基金资助(52174193)

Research on dynamic change characteristics of three-dimensional spontaneous combustion zone in caving coal face

ZHAO Wenbin¹(), LIU Fangshun¹, SHI Xinyan¹, LIU Hui², WANG Zhongmi³, LI Zhenwu⁴

¹College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao Shandong 266590, China
²Shandong Dongshan Gucheng Coal Mine Co., Ltd., Jining Shandong 272100, China
³Shandong Dongshan Wanglou Coal Mine Co., Ltd., Jining Shandong 272100, China
⁴Shandong Jining Energy Development Group, Jining Shandong 272073, China

Received:2021-12-11 Revised:2022-02-18 Online:2022-08-23 Published:2022-09-28

摘要/Abstract

摘要：

为探究采空区自燃带动态分布特征,采用理论分析、数值模拟与现场实测相结合的方法,研究空隙、裂隙结构及氧化速率改变对采空区漏风及氧气体积分数分布特征的影响,揭示综采放顶煤自燃带由采空区后部向工作面顶煤动态变化特性。结果表明:受采动应力及上覆岩层垮落滞后影响,顶煤裂隙及采空区空隙结构随暴露时间延长发生改变;支架后方中上部伞檐空场形成自由扩散漏风;随冒落煤岩体暴露时间增加,耗氧速率增大,顶煤裂隙结构发育,采空区垮落空间上移,中下部内部空隙结构下降,导致自燃带范围由采空区后部向综采支架顶煤范围扩展。

关键词: 综采放顶煤, 立体自燃带, 煤体裂隙, 耗氧速率, 动态变化特性

Abstract:

In order to explore dynamic distribution characteristics of spontaneous combustion zone in goaf, a combination of theoretical analysis, numerical simulation and field measurement were used to study effects of changes in voids, fracture structure and oxidation rate on features of air leakage and oxygen volume fraction distribution, and it was revealed that spontaneous combustion zone of fully mechanized top coal caving changed from the back of goaf to top coal in working face. The results show that the fracture of top coal and void structure of mined-out area change with extension of exposure time due to influence of mining stress and overburden caving lag. Free diffusion air leakage is formed in open field of upper and middle eaves behind the support, and as exposure time of caving coal and rock mass increase, oxygen consumption rate increases, top coal fracture structure develops, caving space in goaf moves up, and internal void structure in middle and lower part declines, leading to the expansion of spontaneous combustion zone from the back of goaf to top coal of fully mechanized mining support.

Key words: fully mechanized top coal caving, three-dimensional spontaneous combustion zone, coal crack, oxygen consumption rate, dynamic change characteristics

赵文彬, 刘方顺, 石新岩, 刘辉, 王忠密, 李振武. 放顶煤工作面立体自燃带动态变化特性研究[J]. 中国安全科学学报, 2022, 32(3): 65-74.

ZHAO Wenbin, LIU Fangshun, SHI Xinyan, LIU Hui, WANG Zhongmi, LI Zhenwu. Research on dynamic change characteristics of three-dimensional spontaneous combustion zone in caving coal face[J]. China Safety Science Journal, 2022, 32(3): 65-74.

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模块名称	数值	模块名称	数值
采空区深度×长×高/(m×m×m)	20×120×9	岩体碎胀系数	1.2
工作面长×宽×高/(m×m×m)	120×5×3.5	氧气体积分数的衰减率/(mol·s^-1)	3.169×10^-5
进回风巷长×宽×高/(m×m×m)	5×5×3.5	下限氧体积分数	0.002 3
工作面倾角/(°)	0	反应指前因子	60
直接顶高度/m	6	煤的活化能/(kJ·mol^-1·K^-1)	100
采高/煤厚,m	3.5/9	氧气体积分数/%	21
垮落岩石容重/(N·m^-3)	2×10⁴~3×10⁴	进回风口压差/Pa	50

放顶煤工作面立体自燃带动态变化特性研究

Research on dynamic change characteristics of three-dimensional spontaneous combustion zone in caving coal face

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