The reasonable layer selection is the main influencing factors for gas drainage by high level borehole, the borehole parameters is based on the caving & fracture zone height of gob.
高位钻孔抽放最主要的影响因素是合理层位选择，其钻孔参数应根据采空区冒落带及裂隙带高度来设计。
In controlling factors of high permeability, the deformation of coal, coal fracture direction, ground stress and drainage rate were discussed.
在渗透率控制因素方面，从煤体变形、煤层裂隙方向、地应力和排采方面对其进行探讨。
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