摘要
为研究负压在瓦斯抽采过程中的影响,提出了负压影响因子的观点,对其进行了赋值分析,并在赋存条件相同,抽采时间不同的煤层巷道建立若干试验观测点钻孔,通过周期性调整钻孔的负压大小记录其抽采钻孔的瓦斯浓度、流量等值,进行数据分析。研究结果表明,钻孔抽采初期,负压影响系数β较低,高负压抽采对提高抽采浓度和抽采流量意义不大,抽采后期,在煤层透气性系数显著提高时,β值增大,适当提高抽采负压,可大幅度提高钻孔瓦斯流量,提高钻孔抽采的瓦斯浓度,缩短抽采周期。
In order to study the impact of negative pressure on the gas extraction process,we proposed the view of negative pressure influence factor β and carry out assignment analysis,and established a number of experimental observation drillings in the same seam with occurrence conditions in different extraction time,through the adjustment of negative pressure of the borehole record including its gas concentration,flow and other factors,analyzing the data,research results show that in early gas drainage of the drilling,negative pressure influence coefficient β is lower,high negative pressure drainage flow is not meaningful to improve drainage concentration and extraction; in the later of the extraction,permeability in coal seam significantly increases,coefficient β value increases; an appropriate increase of the negative pressure drainage can largely increase drilling gas flow,improve the gas extraction concentration of borehole and shorten the cycle of gas drainage.
出处
《煤矿安全》
CAS
北大核心
2015年第2期12-16,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51074066)
国家科技支撑计划资助项目(2013BAA03B02)
关键词
负压影响因子
瓦斯抽采
瓦斯浓度
抽采负压
瓦斯流量
negative pressure influence factor
gas extraction
gas density
drainage negative pressure
gas flow
