摘要
为解决传统动水注浆材料胶凝时间长、动水留存率低、成本高等缺点及“煤电一体化”经营模式下电厂工业固废粉煤灰无法得到有效利用的问题。基于煤矿富水砂层堵水治理需求,以水灰比、粉煤灰掺量、膨润土掺量、缓凝剂掺量为试验因素,以浆液表观黏度、析水率、胶凝时间、动水留存率为指标开展了水泥-粉煤灰-水玻璃注浆材料正交试验,通过极差分析法及综合平衡分析法优选出了满足工程需求的浆液配比。基于最优浆液配比,开展了动水注浆堵水效果模拟试验,分析了注浆压力、注浆量对浆液堵水性能及扩散能力的影响规律,验证了优选浆液在动水条件下的堵水效果。结果表明:最优浆液配比为水灰比1.2、粉煤灰掺量30%(质量分数)、膨润土掺量6%(质量分数)、缓凝剂掺量1.75%(质量分数)、水玻璃掺量5%(质量分数);优选浆液有效扩散距离与注浆量呈正相关关系,随着注浆量增加,浆液的扩散能力逐渐增加,浆液损耗量逐渐减少;当注浆压力不小于40 kPa、注浆量不小于800 mL时,最优浆液配比下注浆材料的平均堵水率超过90%,堵水效果优秀。
To address the drawbacks of traditional dynamic water grouting materials,such as long gelation time,low dynamic water retention rate,high cost,as well as the problem of ineffective utilization of industrial solid waste fly ash in power plants under the“coal electricity integration”business model.Based on the demand for water blocking treatment in coal mine water rich sand layers,orthogonal experiments were conducted on cement-fly ash-water glass grouting materials using slurry water-cement ratio,fly ash content,bentonite content,and retarder content as experimental factors,and slurry apparent viscosity,water separation rate,gelation time,and dynamic water retention rate as indicators.The optimal slurry ratio that meets the engineering requirements was selected through range analysis and comprehensive balance analysis.Based on the optimal slurry ratio,a simulation experiment was conducted on the water blocking effect of dynamic water grouting materials.The effects of grouting pressure and grouting volume on the water blocking performance and diffusion ability of slurry were analyzed,and the water blocking effect of optimal slurry under dynamic water conditions was verified.The results show that the optimal slurry ratio is water-cement ratio of 1.2,fly ash content of 30%(mass fraction),bentonite content of 6%(mass fraction),retarder content of 1.75%(mass fraction),and water glass content of 5%(mass fraction).The effective diffusion distance of optimal slurry shows a positive correlation with grouting volume.As the grouting volume increases,the diffusion capacity of slurry enhances while slurry loss decreases.When the grouting pressure is not less than 40 kPa and the grouting volume is not less than 800 mL,the average water blocking rate of grouting materials under optimal slurry ratio exceeds 90%,demonstrating excellent water blocking effect.
作者
郑颖悟
马泓健
侯宁
申恒明
黄峰
ZHENG Yingwu;MA Hongjian;HOU Ning;SHEN Hengming;HUANG Feng(Shaanxi Nuclear Industry Engineering Investigation Institute Co.,Ltd.,Xi’an 710054,China;School of Engineering and Technology,China University of Geosciences Beijing,Beijing 100083,China)
出处
《硅酸盐通报》
北大核心
2025年第8期2933-2943,共11页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(41807230)
中央高校基本科研业务费科技转化培育项目(4-2-2022-018)。
关键词
粉煤灰
注浆堵水材料
正交试验
动水留存率
堵水率
fly ash
grouting water blocking material
orthogonal experiment
dynamic water retention rate
water blocking rate
