coal seam

The surrounding rock of roadways in soft coal seam has low strength and bad stability.

软煤巷道围岩强度低,稳定性差.

Coal Mine, its coal seam is easily spontaneous fire.

大雁二矿煤种为褐煤, 属易自燃发火煤层.

Factors affected coal seam permeability change and its law is analyzed.

分析了煤层透气性变化的影响因素及变化规律.

The Gaussian curvature of No.3 coal seam in Qinshui basin is calculated.

计算了沁水盆地3号煤层的高斯曲率.

Essential way of solving the gas drainage problem of low permeability coal seam is seam permeability.

高瓦斯低透性煤层的瓦斯抽放,一直是煤矿安全生产过程中的重大技术难题.

This paper goes further into blast-winning technology of the composite coal seam face.

深入探讨了复合煤层回采工作面“松动放炮”落煤的工艺问题.

The spontaneous combustion of coal seam endangers the safe production.

井下煤层自燃严重危害着安全生产.

Coal Mine and the coal seam 13-1 has especially complex hydrogeology condition.

新集二矿在特定推覆体水体下的煤层开采, 13-1 煤开采水文地质条件尤为复杂.

The average UK coal seam is one metre thick.

英国煤层的平均厚度为1米。

The migrating methane by cross-borehole in coal seam is used in this condition.

交又钻孔抽放本煤层瓦斯正是在这种条件下产生的.

Exploration evaluation coal seam gas is a base of coal seam gas exploration and developing.

煤层气的勘探评价,是开展煤层气勘探与开发工作的基础.

On a global scale, there are many coalfields suffered from spontaneous combustion of coal seam problems.

在全球范围内, 许多煤田都存在煤层自燃问题.

This paper is a guide to precise determination of the content of coal seam methane.

对正确测定煤层瓦斯含量有一定的指导意义.

Grave protrusion coal seam tunnelling hydraulic cutting protrusion-dispelling measures is a new technology in the world.

严重突出煤层掘进水力掏槽防突措施在国际上是一种防突新技术.

There are of forms of gas discharge , but the form is soft coal seam gas discharge.

目前在瓦斯抽放中急待解决的问题是软煤层瓦斯抽放的打钻技术,尤其是深孔打钻技术.