摘要:
针对现行瓦斯抽采钻孔封孔存在的封孔工艺繁琐、操作要求高、适用范围有限、抽采瓦斯浓度偏低、钻孔有效抽采周期短等技术难题,提出了采用新型封孔装置进行封孔,阐述了新型封孔装置的封孔的原理。对新型封孔装置+水泥浆封孔与聚氨酯+水泥浆封孔后的瓦斯抽采浓度进行了对比试验,试验结果表明:应用新型封孔装置+水泥浆封孔,单孔封孔仅需25 min,而聚氨酯+水泥浆封孔需55 min;封孔抽采48 d后,新型封孔装置+水泥浆封孔钻孔平均瓦斯体积分数在33%左右,远高出聚氨酯+水泥浆封孔钻孔抽采的瓦斯体积分数4%。新型封孔装置封孔工艺简单,封孔后钻孔抽采瓦斯浓度高、时间长,具有推广应用价值。
Abstract:
According to the complicated borehole sealing technique and high operation requirements existed in the available borehole sealing of the gas drainage, t he limited application scope, low gas drainage concentration, short effective gas drainage period of the borehole and other technical difficulties, a new borehole sealing device was applied to seal the borehole. The paper stated the borehole sealing principle of the new borehole sealing device. A comparison analysis was conducted on t he gas drainage concentrations between the new borehole sealing device + cement grout borehole sealing and the polyurethane + cement grout borehole sealing, the e xperiment results showed that with the application of the new borehole sealing device + cement grout borehole sealing, a single borehole sealing would only require 25 min and the polyurethane + cement grout borehole sealing would require 55 min for a single borehole. After 48 days of the borehole sealing and gas drainage, the aver age gas volume fraction of the new borehole sealing device + cement grout borehole sealing was about 33% and was higher than the gas volume fraction 4% drained fr om the polyurethane + cement grout sealing borehole. The borehole sealing technique of the new borehole sealing device was simple and after the borehole sealing, th e gas drainage concentration from the borehole would be high and the gas drainage time would be longer with a promotion and application value.
下载:
