在本煤层抽放瓦斯工程中，有效半径和钻孔间距是合理布置抽放钻孔的两个主要参数。

The effective radius and rational distances between bores of drainage gas in coal seams are two of the fundamental parameters of the rational arrangement bores in the engineering of drainage gas.

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钻孔使用配套冲击电钻。钻孔时，孔洞间距与孔洞深度应满足设计要求。

Supporting the use of impact drilling electric drill. Drilling, hole spacing with hole depth should meet the design requirements.

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这篇短文主要讨论如何在地热系统的设计与安装中，如确定系统钻孔的深度和孔与孔之间的间距，并且给出了向关的应用建议。

In this paper we shall deal with the issue of borehole depth and spacing. in the geothermal insights, and gives Application Recommendations.

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