Directivity effect of unloading bedding coal induced fracture evolution and its application

Pan Rongkun; Fu Dong; Yu Minggao; Chen Lei

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Directivity effect of unloading bedding coal induced fracture evolution and its application

机译：卸煤层状煤诱导裂缝演化的方向性效应及其应用

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In the coal mining process, the gas contained in the coalbed is one source of the most serious accident hazards. Stress releasing from the coal deposit is the main controlling factor that leads to such accidents. Based on the bedding of coal samples, the gas permeability well describes the evolution of fracture, so the paper carries out research on the permeability properties of coal under different unloading directions. The research obtains that when the stress unloading direction is perpendicular to bedding, more penetrating fractures and bedding fractures occur, and the permeability significantly increases. Although the axial stress reduced, the confining pressure makes the permeability of the bedding plane fracture exist under constant. The permeability obtained when the unloading direction was perpendicular to the bedding is 52 times larger than that when it is parallel to the bedding. The results show that the efficiency of gas drainage is impacted by the relative direction of gas drainage drilling in relation to the bedding orientations. The maximum amount of gas extraction when drilling is perpendicular to the bedding is 1.3 times than that when drilling is oblique to the bedding, and 1.75 times than that when drilling is parallel to the bedding.

机译：在煤矿开采过程中，煤层中所含的气体是最严重的事故隐患之一。煤层释放的应力是导致此类事故的主要控制因素。基于煤样的层理，透气性很好地描述了裂缝的演化，因此对不同卸荷方向的煤的渗透性进行了研究。研究发现，当应力卸荷方向垂直于层理时，会发生更多的穿透裂缝和层理裂缝，渗透率会显着增加。尽管轴向应力减小了，但限制压力使层理面裂缝的渗透率恒定存在。卸荷方向垂直于地层时的渗透率比平行于地层时的渗透率大52倍。结果表明，瓦斯抽放效率受瓦斯抽放钻孔相对于层理取向的相对方向的影响。垂直于地层钻探时最大抽气量是倾斜地层钻探时最大抽气量的1.3倍，是平行于地层钻进时最大抽气量的1.75倍。

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来源
《矿业科学技术学报：英文版》 |2017年第005期|P.825-829|共5页
作者
Pan Rongkun; Fu Dong; Yu Minggao; Chen Lei;
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作者单位

[1]Department of Safety & Science Engineering, Henan Polytechnic University, Jiaozuo 454003, China;

[2]The Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo 454003, China;

[3]Henan Key Laboratory of Prevention and Cure of Mine Methane & Fires, Jiaozuo 45403, China;

[4]State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 CHI
中图分类矿业工程;
关键词
Unloading direction; Bedding structure; Gas permeability; Fracture evolution;

机译：卸荷方向;层理结构;透气度;断裂演化;

Directivity effect of unloading bedding coal induced fracture evolution and its application

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