西安科技大学学报2015，Vol.35Issue(6)：682-687,6.DOI:10.13800/j.cnki.xakjdxxb.2015.0602
覆岩采动卸压瓦斯高位钻孔抽采技术
High level borehole drainage technique of the overlying strata mining-induced pressure-relief gas
摘要
Abstract
To solve the problem of the gas consistence exceeding limit at the corner of coalface,a new method that pressure-relief gas in fractured zone of the upper section coalface's overlying strata was ex-tracted by high level boreholes in lateral high drainage roadway was proposed. Based on the mining tech-nology conditions of the No. 2-603 coalface of Liyazhuang coal mine,mechanical model of the high level borehole was established,the reasonable final hole position of the high level borehole was determined by theoretical analysis,numerical simulation and field observing analysis. Firstly,the fractured zone was at the height of 13~25 m,38. 6~50 m to the floor,and in the rise-entry mining angle of 62°,and in the down-entry mining angle of 65°,and the final location have been layouted at the second zoon. Secondly, the borehole's final hole position was 44 m high over the roof,and the projection length of the borehole was not less than 28 m in the gob,and the value of the gas concentration was high,and the draining time was long. Finally,the engineering application effect showed that the problem of the gas consistence ex-ceeding limit was solved,the gas consistence at the upper corner were 0. 50% ~0. 95% and 0. 47% ~ 0. 89%,and the coalface was mined safely and effectively.关键词
低透气性煤层/外错高抽巷/采动裂隙/卸压瓦斯/高位钻孔Key words
low permeability coal seam/lateral high drainage roadway/mining-induced fissure/pressure-relief gas/high level borehole分类
矿业与冶金引用本文复制引用
双海清,王红胜,李树刚,杜政贤,由临东,郭卫彬..覆岩采动卸压瓦斯高位钻孔抽采技术[J].西安科技大学学报,2015,35(6):682-687,6.基金项目
国家重点基础研究计划(973计划)资助项目(2015CB251600) （973计划）
国家自然科学青年基金项目(51304156) （51304156）
