摘要
为了研究浅埋煤层覆岩采动裂缝发育特征对采空区漏风的影响,以安山煤矿5^(-2)煤工作面为研究背景,基于覆岩采动裂缝发育特征与流体力学理论,通过现场实测与理论分析相结合的方法对裂缝的导气特征进行了研究。研究表明,5^(-2)煤工作面开采后,地表裂缝呈近似等间距平行分布,周期来压步距平均为14m;在负压通风条件下,回风巷附近采空区漏风量较大,且裂缝张开量小于0.4m时,其漏风量变化不大;沿工作面走向方向,采空区覆岩采动裂缝的贯通发展区范围为210m,工作面应在该煤层的最短自然发火期内推过此范围,来保障采空区遗煤不发生自燃。
In order to analyze the influence of the development fractures to air leakage when mining in the goaf of shallow coal seams,we took the 5^(-2)coal face of Anshan Coal Mine and studied the air conduction characteristics of fractures though field measurement and theoretical analysis based on the development characteristics of mining-induced overburden fracture and hydromechanics theory.The result shows that after the mining of the 5^(-2)coal face,the surface fractures are distributed parallel with approximately equal intervals,and the periodic weighting step is 14m on average;under sub atmospheric pressure ventilation,the amount of air leakage in the goaf near the return air way is large,and when the fracture opening is less than 0.4m,the amount of air leakage does not change much;along the direction of the mining face strike,the development area of cut-through mining-induced fractures is within 210m in overburden,and the mining face should advance through that area before the shortest spontaneous combustion period of the coal seam,to prevent spontaneous combustion of left-over coal in the goaf.
作者
刘清洲
张杰
赵加才
宋守亚
王高云
董博
LIU Qing-zhou;ZHANG Jie;ZHAO Jia-cai;SONG Shou-ya;WANG Gao-yun;DONG Bo(Shaanxi Guojiahe Coal Industry Co.,Ltd.,Baoji 721500,China;School of Energy Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2021年第12期131-135,共5页
Coal Engineering
基金
国家自然科学基金资助项目(51774229)
陕西省创新能力支撑计划-科技创新团队项目(2018TD-038)
陕西省自然科学基础研究计划(陕煤联合基金)项目(2019JLM-41)。
关键词
浅埋煤层
采动裂缝
裂缝尺度
漏风
流体力学
shallow coal seam
mining-induced fracture
fracture scale
air leakage
hydromechanics
