Research into comprehensive gas extraction technology of single coal seams with low permeability in

来源 :矿业科学技术(英文版) | 被引量 : 0次 | 上传用户:w19282
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
For a low permeability single coal seam prone to gas outbursts,pre-drainage of gas is difficult and inefficient,seriously restricting the safety and efficiency of production.Radical measures of increasing gas extraction efficiency are pressure relief and infrared antireflection.We have analyzed the effect of mining conditions and the regularity of mine pressure distribution in front of the working face of a major coal mine of the Jiaozuo Industrial (Group) Co.as our test area,studied the width of the depressurization zone in slice mining and analyzed gas efficiency and fast drainage in the advanced stress relaxation zone.On that basis,we further investigated and practiced the exploitation technology of shallow drilling,fan drilling and grid shape drilling at the working face.Practice and our results show that the stress relaxation zone is the ideal region for quick and efficient extraction of gas.By means of an integrated extraction technology,the amount of gas emitted into the zone was greatly reduced,while the risk of dangerous outbursts of coal and gas was lowered markedly.This exploration provides a new way to control for gas in working faces of coal mines with low permeability and risk of gas outbursts of single coal seams in the Jiaozuo mining area.
其他文献
Millimeter-wavelength radar has proved to be an effective instrument for cloud observation and research.In this study,8-mm-wavelength cloud radar (MMCR) with Do
As the excavation of roadway,new fractures will be formed and the pre-existing fractures extend with the redistribution of stress in surrounding rocks.Eventuall
1故障现象一辆2003款的北京现代索纳塔轿车2.7GLS,行驶里程为5万公里。按下遥控钥匙上行李厢开关,指示灯亮但行李厢无反应。使用遥控钥匙按下中控门锁的开启和关闭按钮.门锁可正
Satellite data obtained over synoptic data-sparse regions such as an ocean contribute toward improving the quality of the initial state of limited-area models.B
中国车手的胜利,让我们在12个小时的等待后激动无比,毫无倦意。继8月的精彩赛事之后,“大众汽车中国赛车Scirocco R-Cup”第五场分站赛再次登陆马来西亚雪邦赛道。与以往不同
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
Evapotranspiration is one of the key components of hydrological processes.Assessing the impact of climate factors on evapotranspiration is helpful in understand
The ability to predict the future behavior of solar activity has become extremely import due to its effect on the environment near the Earth. Predictions of bot
Polythiophene/WO3 (PTP/WO3) organic-inorganic hybrids were synthesized by an in situ chemical oxidative polymerization method,and characterized by X-ray diffrac
On the Tibetan Plateau,the alpine meadow is the most widespread vegetation type.The alpine meadow has a low biological productivity and low vegetation coverage