综放工作面初采期煤与瓦斯共采试验研究  

Study and Test on the Integrated Coal and Gas Extraction of Full Mechanized Caving Face at Initial Mining Period

作　　者：马延崑 郭勇义[1,2] 吴世跃[1] 李川田[2] 闫晋文[1] 秦贵成 

机构地区：[1]太原理工大学矿业工程学院,太原030024 [2]太原科技大学,太原030024 [3]潞安集团余吾煤业,山西长治046031

出　　处：《太原理工大学学报》2014年第1期65-70,共6页Journal of Taiyuan University of Technology

基　　金：国家科技支撑计划资助项目(2007BAK29B01);山西省科技攻关资助项目(2007031120-02)

摘　　要：回采工作面初采期间瓦斯涌出异常，通常被称为困难时期。文中以余吾煤业N2105工作面为例，理论分析了工作面煤与瓦斯共采机理，采用数值模拟的手段，用走向模型分析初采期覆岩中裂隙演化规律，倾向模型判断覆岩卸压稳定后采动裂隙发育区分布。研究得出，初采期间，伴随顶板来压现象，覆岩采动裂隙逐步向高层位发育，采空区内冒落岩层被压实时，裂隙发育达到最高层位；距采空区上端头0～50m范围和煤层顶板上方30～50m范围空间交汇处，形成高浓度瓦斯富集区。工程试验表明，N2105工作面初采期间，覆岩采动裂隙逐渐发育，推进距达100～120m之间时，50#高位钻场瓦斯抽采量稳定在最高水平10m^3／min，采动裂隙发育达到最高层位，并提出了高瓦斯工作面初采期定义，认为采空区内压实区形成时初采困难期结束。The initial mining period of working face is usually called hard times owing to abnormal gas effusion. The principles of the integrated coal and gas extraction on N2105 working face of Yuwu mine were illuminated in this paper. By using the numerical simulation method, the law of fissures evolution is studied by the strike model and the distribution of highly developed fissure zones was determined by dip model. It was obtained that the development of fractures in overburden tends towards high horizons with roof weighting, and reaches the highest horizons while the caving rocks in gob is being compacted. The intersection of the range spacing upper end of gob 0-50m and the range spacing seam roof 30-50m can be the gassy area. The Engineering test indicates that mining-induced fractures at the initial mining of N2105 face developed gradually and the quantity of gas extracting in No. 50 drilling yard maintains highest level of 10 ma/min when the cumulative footage was in the range of 100-120 m, which means fissures reached the maximum of horizons. Then, the definition of initial mining period was proposed, which shows the formation of the compaction area marks an end of initial mining.

关 键 词：初采期 卸压 裂隙演化 煤与瓦斯共采 

分 类 号：TD712.623[矿业工程—矿井通风与安全]