Technique of coal mining and gas extraction without coal pillar in multi-seam with low permeability

被引:5
|
作者
YUAN Liang ( Huainan Mining (Group) Co. Ltd.
机构
关键词
coal seam with low permeability; without coal-pillar; gob-side roadway retaining; roadway retaining and borehole drilling; coal mining and gas extraction;
D O I
暂无
中图分类号
P618.11 [煤];
学科分类号
0709 ; 081803 ;
摘要
Aimed at the low mining efficiency in deep multi-seams because of high crustalstress,high gas content,low permeability,the compound "three soft" roof and the trouble-somesafety situation encountered in deep level coal exploitation,proposed a new idea ofgob-side retaining without a coal-pillar and Y-style ventilation in the first-mined key pressure-relieved coal seam and a new method of coal mining and gas extraction.The followingwere discovered:the dynamic evolution law of the crannies in the roof is influenced bymining,the formative rule of "the vertical cranny-abundant area" along the gob-side,thedistribution of air pressure field in the gob,and the flowing rule of pressure-relieved gas ina Y-style ventilation system.The study also established a theoretic basis for a new miningmethod of coal mining and gas extraction which is used to extract the pressure-relievedgas by roadway retaining boreholes instead of roadway boreholes.Studied and resolvedmany difficult key problems,such as,fast roadway retaining at the gob-side without a coalpillar,Y-style ventilation and extraction of pressure-relieved gas by roadway retainingboreholes,and so on.The study innovated and integrated a whole set of technical systemsfor coal and pressure relief gas extraction.The method of the pressure-relieved gasextraction by roadway retaining had been successfully applied in 6 typical working faces inthe Huainan and Huaibei mining areas.The research can provide a scientific and reliabletechnical support and a demonstration for coal mining and gas extraction in gaseous deepmulti-seams with low permeability.
引用
收藏
页码:120 / 128
页数:9
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