top coal caving in steep seam face
Seam with Outburst in Potential
outburst
瓦斯
突发
防突
煤
突
突出
爆发
瓦
喷出
爆
煤与瓦斯突出
突出
破裂
爆炸
闪光
尖头信号
脉冲
瓦斯突出
外爆气流
爆突
外行向
冰川洪水
外爆流
爆燃
deep inclined seam with potential outburst
out of control outburst
outburst prone coal seam
OUTBURST OF COAL AND GAS
exposing coal seam to prevent gas outburst
gas outburst and controlling