低黏度超细水泥浆液单裂隙注浆试验效果分析
Analysis on Experimental Results of Single Crack Grouting for Low Viscosity Ultra-fine Cement Slurry
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摘要: 针对城郊煤矿现场注浆堵水问题,通过室内注浆试验来模拟现场的注浆工程,对比3种不同黏度的超细水泥浆液的注浆效果;对泥质砂岩单裂隙试件进行注浆试验,测试砂岩单裂隙试件注浆后的黏结强度恢复能力和抗渗能力,宏观评价注浆效果;运用SEM电镜扫描与数字图像处理技术,统计注浆前后的砂岩单裂隙试件断面的特征孔隙率,微观评价注浆效果。研究表明:优化组低黏度浆液注浆后黏结强度提升了35%,渗水速率平均下降到1.39 mL/h,并且断面特征孔隙率达到最小值1.31%,表明优化组低黏度超细水泥浆液具有良好的注浆效果。Abstract: For the problem of grouting and plugging water in Chengjiao Coal Mine, the indoor grouting experiment is used to simulate the grouting project on site. The grouting effect of three kinds of ultra-fine cement grout with different viscosity is compared. The grouting test was carried out on the single fracture specimen of argillite sandstone to test the bonding strength recovery ability and impermeability after the grouting of the single fracture specimen of sandstone, and to evaluate the grouting effect at a macro level. By means of SEM scanning and digital image processing technology, the characteristic porosity of the sandstone single crack specimen before and after grouting is counted, and the grouting effect is evaluated microscopically. The research shows that the bond strength of the optimized low-viscosity slurry increased by 35%, the water seepage rate decreased to 1.39 mL/h, and the cross-sectional characteristic porosity reached the minimum value of 1.31%, indicating that the optimized group of low-viscosity ultra-fine cement slurry has good grouting effect.
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