矿用灌浆注胶防灭火材料流动性能的实验研究

Experimental study of mine grout injection plastic fire prevention materials flow properties

基于粉煤灰的灌浆技术是常用的一种矿井火灾防治方法,为解决灌浆过程中高浓度浆液远距离输送易堵塞管路的问题,研究了聚丙烯酰胺复合胶体添加剂PA加入前后粉煤灰浆液的悬浮性及其在管路中的固液两相流动特性。研究结果表明：随着粉煤灰添加量的增加,自悬浮性增强,且PA的适量加入可提高粉煤灰浆液悬浮效果;随着粉煤灰添加量的增加,PA添加量的增加对悬浮效果影响不大;从增稠和悬浮性能考虑,PA添加剂用量应控制在0.01%~0.02%;同时复合胶体材料在管道中以较高速度流动时具有的减阻性,有利于管道输送胶体;低速流动时,阻力大于水,胶体可大量滞留大煤层裂隙中,有利于堵漏风和灭火。

Fly ash-based grouting technology is commonly used as a mine fire prevention method. In order to solve the problem of pipeline blocking in long-range transport of high concentration slurry, by adding polyacrylamide gel additive composite PA,this study investigated the fly ash slurry suspension,and solid-liquid two-phase flow characteristics before and after the PA addition. The results show that with the increase of fly ash amount added, the fly ash slurry suspension is enhanced;also the PA can improve the fly ash slurry suspension results. With the amount increase of PA added, there is little effect on the suspension. From thickening and suspension performance considerations, PA additive dosage should be controlled at 0. 01% -0. 02%. Meanwhile the composite colloidal material in the pipeline with a high speed now reduces the drag force, which is favorable to pipeline colloid transportation. Low flow resistance for colloid material is larger than that in water, and the colloid retention in seam cracks is in favor of plugging air and fire.