Composition of Properties of Spbagnum Peat in the Northeast China with Those in Byelorussia;
高位沼泽的形成环境与机制
make section in a low position without high thread-drawing drain of wide trauma spacious set;the control one take low section,make an exit at the top fistula pipe at the high position,slowly cut with rubber thread,tighten the thread 7~10d after operation.
[目的]探讨问题高位(复杂性)肛瘘有效治疗方法。
It introduced one method of extracting the gas in 23702 working surfaces through elevated lanes to solve the gas problem in upper corners.
介绍23702工作面利用高位巷道抽放瓦斯解决上隅角瓦斯的一种方法。
Theory and practices on high level borehole gas drainage technology;
高位钻孔瓦斯抽放技术理论与实践
Gas drainage with high level borehole in roof applied to gas control;
顶板高位钻孔抽放在瓦斯治理中的应用
Application of gas drainage technology with high level boreholes in Zhuzhuang Mine;
朱庄煤矿高位钻孔瓦斯抽放技术的应用
The goaf gas drainage is carried out by drilling holes with strike and middle-high-order at the π type caving coal face in the inflammable and high coal seam.
易发火特厚煤层π放工作面利用走向中高位钻孔实施采空区瓦斯抽放,解决了工作面瓦斯超限制约工作面生产的问题,效果显著,为低瓦斯矿井实现高体积分数瓦斯抽放提供了可行性依据。