Water inrush from the bottom coal layer in mining work faced now is rather serious in Northern China coalfield, which constraints seriously the normal economical benefits.
在我国华北煤矿区，回采工作面煤层底板突水问题相当严重，困扰着煤矿经济效益的正常发挥。
The coal and limestone storage yard must have a bottom impermeabilization system. This system may be constituted by a clay layer, a geomembrane layer, or other impervious material.
煤料和石灰石存放场必须有底部防渗系统。该系统可由粘土层、地质处理用膜层、或其他防渗材料组成。
The magma under coal layer bottom does support action.
而煤系地层底部的岩浆侵入体，起了砥柱作用。
The stress distribution and displacement variation of the coal top and bottom layer at different distances from the face are discussed;
探讨了煤体顶、底分层在距工作面不同距离上应力分布及位移变化特征的差异性；
The stress distribution and displacement variation of the coal top and bottom layer at different distances from the face are discussed;
探讨了煤体顶、底分层在距工作面不同距离上应力分布及位移变化特征的差异性；
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