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为了在瓦斯抽采钻孔施工过程中对帷幕注浆加固材料进行优选,通过黏度和抗压强度,确定高延性水泥基复合材料的基本水灰比。采用粉煤灰、微硅粉以及聚乙烯醇作为掺合剂,研究了不同掺合剂配比对注浆加固材料性能的影响,包括浆液黏度、凝结时间及固结煤体渗透率和抗压强度。试验结果表明:高延性水泥基复合材料的基本水灰比为0.75∶1;水灰比对注浆材料的黏度和抗压强度影响显著,注浆材料黏度与固结煤体渗透率、抗压强度、弹性模量受掺合剂配比影响明显;与其它体系相比,体系1(粉煤灰、微硅粉以及聚乙烯配比分别为(5%、15%、3%)注浆材料黏度适中,固结煤体渗透率较低,抗压强度最高,其注浆效果最优。
In order to optimize the curtain grouting reinforcement material during the process of gas drainage drilling, the basic water cement ratio of high ductility cementitious composites is determined by the viscosity and compressive strength. Using fly ash, silica fume and polyvinyl alcohol as admixture, the effect of different admixtures on the properties of grouting reinforcement was studied, including the viscosity of slurry, setting time and the permeability and compressive strength of consolidated coal. The results show that the basic water-cement ratio of high ductility cement-based composites is 0.75:1. The water-cement ratio has a significant effect on the viscosity and compressive strength of grouting materials. The viscosity of grouting material and the permeability of consolidated coal, compressive strength The strength and modulus of elasticity were significantly affected by the blending ratio of the mixture. Compared with other systems, the viscosity of the system 1 (5%, 15%, 3%, respectively) Moderate, consolidated coal permeability is lower, the highest compressive strength, the grouting effect of the best.