黄土和风积砂为骨料的高浓度胶结材料流变特性研究

发布时间：2018-04-25 01:04

本文选题：采空区 + 高浓度充填浆液　；参考：《煤矿安全》2017年12期

【摘要】：为保证高浓度浆液顺利输送及掌握其在采空区中的堆积效果,对高浓度胶结充填材料进行流变特性研究。选取水泥和粉煤灰为胶凝材料,风积砂和黄土为骨料,对不同胶凝材料和不同骨料配比下高浓度充填浆液流变特性的影响规律进行研究,得到了各因素关于高浓度充填浆液的剪切应力、表观黏度、屈服应力、塑性黏度,以及触变性之间的关系。结果表明,不同黄土和风积砂掺比下高浓度充填浆液均有一定触变性,且骨料中黄土所占比例越大,触变性越大。高浓度充填浆液的剪切速率与剪应力曲线在剪切速度增加区间和剪切速率减小区间数据均服从宾汉模型关系,且同一剪切速率下随着黄土掺加比例的增加所需剪切应力增加,表观黏度增加。提出用细料(黄土、水泥和粉煤灰)和骨料(砂)质量比来确定浆液对流变特性的影响关系,细料骨料比越大,屈服应力越小,塑性黏度越小,触变性越小,浆液流动性越好。
[Abstract]:In order to ensure the smooth transportation of high concentration slurry and its accumulation effect in goaf, the rheological characteristics of high concentration cemented filling material were studied. Choosing cement and fly ash as cementitious materials, aeolian sand and loess as aggregate, the effects of different cementing materials and different aggregate ratios on rheological properties of high concentration filling slurry were studied. The relationships among the shear stress, apparent viscosity, yield stress, plastic viscosity and thixotropy of high concentration filling slurry are obtained. The results show that there is thixotropy in the high concentration filling slurry with different loess and eolian sand ratio, and the larger the loess proportion in aggregate is, the greater the thixotropy is. The shear rate and shear stress curve of high concentration filling slurry are in accordance with the Bingham model in the shear rate increasing interval and shear rate decreasing interval data, and the required shear stress increases with the increase of loess mixing ratio at the same shear rate. The apparent viscosity increases. The influence of slurry on rheological properties is determined by the mass ratio of fine material (loess, cement and fly ash) and aggregate (sand). The larger the ratio of fine aggregate to aggregate, the smaller the yield stress, the smaller the plastic viscosity, the smaller the thixotropy and the better the fluidity of the slurry.
【作者单位】：中煤科工集团西安研究院有限公司;
【基金】：国家自然科学基金资助项目(51404295) 陕西省自然科学基础研究计划资助项目(2016JM5056;2015JQ5185) 中煤科工集团西安研究院有限公司科技创新基金资助项目(2017XAYZD04)
【分类号】：TD823.7

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