文章详细信息 关键词： 松软煤层;;钻孔护壁;;管套;;拖动式下套 [gap=679]Keywords: soft coal seam;drilling support;casing;dragging
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very soft coal seam 极软厚煤层
loose soft coal seam 松散软煤层
steep soft coal seam 急倾斜松软煤层
Large angle soft coal seam 大倾角松软煤层
thickness of soft coal seam 软煤厚度
soft-broken coal seam 松软破碎煤层
soft outburst coal seam 松软突出煤层
soft projecting coal seam 松软突出煤层
There are many kinds of forms of gas discharge, but the main form is soft coal seam gas discharge.
瓦斯抽放形式有多种，本煤层抽放是其主要形式。
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。
The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.
前言： 石台煤矿II3123工作面为“三软”煤层轻放工作面，顶板破碎易掉，片帮、冒顶时常发生。
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