摘要
为了研究高瓦斯矿井穿层钻孔单孔瓦斯极限抽采量及其流量衰减特征,利用自行研制的煤层钻孔瓦斯流量及浓度检测装置,对底抽巷穿层钻孔单孔瓦斯流量和浓度进行监测,并绘制单孔瓦斯流量和浓度衰减变化规律曲线,基于高负压抽采条件下的单孔瓦斯流量衰减理论、高等渗流力学及弹塑性力学等相关理论综合分析了钻孔瓦斯流量变化衰减规律。结果表明:(1)钻孔瓦斯流量衰减随时间呈现出3个阶段:线性衰减阶段、不稳定波动阶段、稳定平缓衰减阶段;(2)在测定钻孔瓦斯流量衰减系数时,只需进入相对稳定衰减阶段,即监测周期50 d;(3)基于钻孔周围应力与瓦斯抽采流量的相互关系,确定了瓦斯抽采流量与时间呈现负指数关系式。
In order to study a single hole gas limit drainage volume and the flow attenuation characteristics of the borehole passed through beds in the high gassy mine,a gas flow rate and gas concentration detection device in the seam borehole self developed was applied to the measurement on the single hole gas flow and concentration in the borehole passed through beds of the floor gas drainage gateway. The attenuation variation law curves of the single hole gas flow and concentration were drawn. Under the condition of the high negative pressure drainage,based on the single hole gas flow attenuation theory,high seepage mechanics,elastic-plastic mechanics and other related theory,a comprehensive analysis was conducted on the variation and attenuation law of the borehole gas flow. The result showed that：（1）the borehole gas flow attenuation would have three stages with the time passed,including the linear attenuation stage,unstable fluctuation and stable and gentle attenuation stage.（2）When the borehole gas flow attenuation coefficient was measured,the borehole gas flow attenuation was just in a relative stable attenuation stage and the measuring period would be 50 days.（3）Based on the relative relationship between the stress around the borehole and the gas drainage flow,the gas drainage flow and time as determined would be in a negative index relational expression.
作者
张天军
蒋兴科
包若羽
陈佳伟
范亚飞
ZHANG Tianjun;JIANG Xingke;BAO Ruoyu;CHEN Jiawei;FAN Yafei(School of Sciences,Xi＇an University of Science and Technology,Xi＇an 710054,China;School of Safety Science and Engineering,Xi＇an University of Science and Technology,Xi＇an 710054,China)
出处
《煤炭科学技术》
CAS
北大核心
2018年第8期74-79,共6页
Coal Science and Technology
基金
国家自然科学基金资助项目(51374168
51774234
51474172)
关键词
钻孔瓦斯流量
穿层钻孔
瓦斯抽采
高瓦斯矿井
gas flow in borehole
borehole passed through beds
gas drainage
high gassy mine
