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1·Ventilation modeling goes hand in hand with gas drainage strategies.

通风系统建模与瓦斯抽放系统相互相成。

2·The above stated method was successfully applied to 23 large diameter gas drainage boreholes.

采用上述方法已经成功施工23口大口径瓦斯抽排钻孔。

3·By gas drainage, the negative pressure isn't stable in the goal, the coal oxidation accelerates.

由于瓦斯抽放，造成采空区负压不稳定，加速了煤体氧化过程。

4·Practice indicated that the surface boreholes have better effect on gas drainage from mining area.

实践表明，地面钻井对抽放采动区域瓦斯效果较好。

5·During the gas drainage test in No. 12 Mine of Pingdingshan Coal Mining Group, good gas prevention...

通过在平顶山十二矿的试验，取得了良好的瓦斯防治效果。

6·Having analysed the test on the gas drainage under suction in goaf, the failure cause has been found.

通过对采空区抽放瓦斯试验进行分析，找出了试验失败的原因。

7·Essential way of solving the gas drainage problem of low permeability coal seam is to increase coal seam permeability.

解决低透气性煤层瓦斯抽放问题的根本途径是增加煤层的透气性。

8·Directional drilling technique has already become a key link in long broach construction for gas drainage of the mine.

定向钻进技术已经成为煤矿井下抽放瓦斯长钻孔施工成套技术的关键环节。

9·During overlying rock strata being fractured, the surface gas drainage boreholes may be damaged due to ground movement.

在长壁工作面通过的过程中，地面垂直钻孔可能随岩层移动而发生破坏。

10·Therefore, the development of coal-bed gas should be studied according to the principle of gas drainage and its practice.

因此，煤层气开发应充分研究和借鉴抽放瓦斯的原理和实践经验。