upward hole 中文意思是什麼

upward hole 解釋
向上鉆孔
  • upward : adj 向上的,朝上的;上漲的。 an upward glance 抬眼一看。 Prices show an upward tendency 物價趨漲...
  • hole : n 1 洞,穴,孔;(衣服等上的)破洞;傷口;漏洞;窩,坑;水流的深凹處,(河道的)緩流窪。2 (獸的...
  1. By doing single fracture drainage experiments, this paper has successfully presented the logarithm function relationship between ratio of drainage discharge through upward and plumb drainage hole and the ratio of their equivalent diameters. the drainage effect will be the best when the included angle between drainage hole and fracture surface is 21 ~ 36

    4 、通過單裂隙排水試驗,建立了傾斜孔和垂直孔的排水量之比與其交界線的等效直徑比之間的自然對數關系式,排水孔排水量基本隨其與裂隙面的交角減小而增大;對單組裂隙排水的初步分析表明,排水孔與裂隙面的夾角在21 ~ 36范圍內排水效果最佳。
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