hole placement ; hole placing
... 炮眼的负裁：drillhole burden 炮眼的布置：hole placement 炮眼吹洗管：air blowpipe ...
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... hole placement 炮眼的布置 hole placing 炮眼的布置 hole reamming 剧大钻孔 ...
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拱形巷道崩落眼布置采用线形炮眼起爆顺序布置，可克服拱形岩石圈的拱效应，有利于岩石的破碎。
The linear hole patterns and ignition sequence is adopted on the easier shots patterns of arch tunnel. The arch effection of arch rock ring can be overcome , It is favorable for rock fragmentation.
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