soft coal seam的意思|示意

"Pressure relief antireflective" technology is to improve the soft low-permeability coal seam gas extraction rate in an effective way.

“卸压增透”技术是提高松软低透气性煤层瓦斯抽采率的有效途径。

This paper puts forward support plan through analyzing strata behavior regularity of coal roadway in seam with soft roof, soft coal and soft floor.

文章通过对永华煤矿“三软煤层”煤巷矿压规律进行分析，提出了支护方案。

It was succeeded in practical application. It is an useful exploration for the roadway stability control of fully-mechanized top-coal caving long-wall face in soft and thick coal seam.

并成功进行了实践应用，为进一步完善松软厚煤层长壁综放工作面顺槽稳定性控制理论技术体系进行了有益探索。

As the soft coal seam is high gas content and low permeability. it has been difficult and key for the coal seam gas extraction.

由于松软煤层的瓦斯含气量高而透气性又极差，一直是本煤层瓦斯抽采的难点和重点。

Based on the analysis of gas source at the working face with "three-soft" unsteady coal seam, the authors introduce the principle and method of gas suction by roof-rock drilling.

前言： 通过对“三软”不稳定煤层采煤工作面瓦斯来源的分析，介绍了采用顶板岩石钻孔抽放解决瓦斯问题的原理和方法。

However, with the extension of mining depth, the distribution of soft coal seam has been expanding.

然而，随着矿井开采范围的延深，松软煤层的分布范围呈不断扩展趋势。