水泥-粉煤灰胶结矸石充填材料的流变特性与固结机理  

Rheological Properties and Consolidation Mechanism of Cement-Fly Ash Cemented Gangue Backfill Material

作　　者：王小勇 王照明 许海龙 张思达 张飞龙 WANG Xiaoyong;WANG Zhaoming;XU Hailong;ZHANG Sida;ZHANG Feilong(Xiaobaodang Mining Co.,Ltd.,Shaanxi Coal and Chemical Industry Group,Yulin 719302,China;Shennan Mining Co.,Ltd.,Shaanxi Coal and Chemical Industry Group,Yulin 719302,China;Shaanxi Tiandi Geology Co.,Ltd.,Xi′an 710054,China)

机构地区：[1]陕西煤业化工集团陕西小保当矿业有限公司,陕西榆林719302 [2]陕西煤业化工集团神南矿业有限公司,陕西榆林719302 [3]陕西天地地质有限责任公司,西安710054

出　　处：《有色金属工程》2024年第6期134-143,共10页Nonferrous Metals Engineering

基　　金：陕西省重点研发计划一般项目(2023-YBSF-544);陕西省煤田地质集团重大专项项目(SMDZ-2022ZD-1);陕煤联合基金项目(2021JLM-14)。

摘　　要：将粉煤灰、水泥、煤矸石和水作为充填材料进行充填,既能实现固体废弃物的资源化利用,还能有效控制矿山地表沉降。研究针对胶结矸石充填材料进行了流变测试、力学性能测试以及水化特性试验,分别研究了矸石充填材料的流变特性、抗压强度、水化产物以及微观结构。结果表明:当325普通硅酸盐水泥含量为15%、低钙粉煤灰掺量超20%、料浆质量浓度保持在77%以上时,所制备的矸石充填试样28 d龄期的最小抗压强度超4.229 MPa,可以为井下充填开采提供良好的顶板支撑。通过流变试验探究了粉煤灰掺量和料浆质量浓度变化对矸石充填料浆流变性能的影响,并得到了充填料浆所对应的流变参数以及流变方程拟合。此外,对矸石胶结充填材料的矿物成分、水化产物以及微观结构进行了研究。研究可为大宗固体废弃物在矿山充填领域应用提供一定的理论指导。Fly ash,cement,coal gangue and water are used as backfill materials to backfill in mine,which can not only realize the large-scale utilization of solid waste resources,but also effectively control the surface subsidence of the mine.In this study,the rheological properties,mechanical properties and hydration characteristics of cemented gangue backfill werestudied.The rheological properties,compressive strength,hydration products and microstructure of gangue backfill werestudied respectively.The results showed that when the content of 325 ordinary Portland cement was 15%,the content of low calcium fly ash is more than 20%,and the mass concentration of slurry was kept above 77%,the minimum compressive strength of the prepared gangue backfill sample at 28 d curing age was more than 4.229 MPa,which provided good roof support for underground backfill mining.Secondly,the influence of fly ash content and slurry mass concentration on the rheological properties of gangue filling slurry were investigated by rheological test,the corresponding rheological parameters and rheological equation fitting of filling slurry are obtained.In addition,the mineral composition,hydration products and microstructure of gangue cemented backfill materials were studied.Therefore,this study can provide some theoretical guidance for the application of solid waste in the field of mine backfill.

关 键 词：固废 抗压强度 流变特性 水化特性 固结机理 

分 类 号：TD853.34[矿业工程—金属矿开采]