榆林曹家滩煤矿井下充填注浆材料制备研究

Study on Preparation of Underground Filling Grouting Material in Caojiatan Coal Mine of Yulin

围绕曹家滩煤矿井下充填工业试验开展了注浆材料制备研究。通过固定水灰比,改变级配,分析浆体对粗颗粒矸石粉(>0.15mm)的容纳极限;改变水灰比,固定级配,分析水灰比对浆体粗颗粒占比的影响。试验显示:固定水灰比为1.7∶1,粗颗粒(>0.15mm)占比40%以下,浆液状态稳定且具备可注性;固定水灰比为1.4∶1,粗颗粒(>0.15mm)占比高达70%,浆体依旧稳定。研究表明:水灰比减小,浆体对粗颗粒(>0.15mm)的容纳极限增大。

Research on the preparation of grouting materials is carried out around the underground filling industrial test in Caojiatan Coal mine.By fixing the water-ash ratio and changing grain composition,the tolerance limit of the slurry on the coarse particle gangue powder(>0.15mm)is analyzed.And by fixing grain composition,the influence of the water-ash ratio on the proportion of coarse particles in the slurry was analyzed.The results show that the slurry state is stable and injectable when the fixed water-ash ratio is 1.7∶1,the coarse particles(>0.15mm)account for less than 40%.The slurry is still stable when the fixed water-ash ratio is 1.4∶1,and the coarse particles(>0.15mm)account for up to 70%.In addition,the tolerance limit of the slurry to coarse particles(>0.15mm)increases when the water-ash ratio decreases.