综放工作面过向斜构造深孔全封闭注浆加固技术

在综放工作面过向斜构造区时,为加固破碎、裂隙发育的煤层顶板,采取了工作面超前进行深孔全封闭注浆技术。通过现场钻孔窥视煤体内部结构和破坏范围,确定采用水泥浆和低黏度化学浆联合加固方式。结果表明:采用水泥浆可封闭1 mm以上裂隙,同时隔断化学浆表层渗透通道。采用无机与有机材料混合加注的方式,整体注浆效果比使用单一材料注浆好。经巷道向工作面超前深孔全封闭注浆,使注浆施工与回采工作面生产互不影响,对向斜构造区域煤体进行了有效加固,保证了工作面在该构造区域安全快速推进。

Full Length Sealed Grouting Reinforcement Technology with Deep Boreholes for Fully Mechanized Longwall Mining Face Passed Through Syncline Tectonic

In order to reinforce the broken and crack developed seam roof when the fully mechanized top coal caving mining face passed through the syncline tectonic,a deep borehole full sealing pre-grouting technology was applied to the coal mining face.With the site borehole to peep the inner structure and failure scope of the coal seam,the combined reinforcement method with the cement grout and the low viscosity chemical grout was adopted.The results showed that the cement grout could seal the cracking over 1 mm and...