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。
In order to ensure the smooth transportation of high concentration filling slurry and the effect of accumulation in goaf,the rheological properties of high concentration filling materials were studied.This paper makes a preliminary study of the effect of cement and fly ash as cementitious materials and aeolian sand and loess as aggregates on the rheological properties of high concentration filling material under a series of samples with different binder-aggregate ratios.The relationship between the factors and the shear stress,apparent viscosity,yield stress,plastic viscosity,and thixotropy of the high concentration filling slurry was obtained.The results show that,high concentration filling materials with loess and aeolian sand as aggregate all have a certain thixotropy,and the larger the proportion of loess in aggregate,the greater the thixotropy.The shear rate and shear stress curve of the high concentration filling slurry are all subject to the Bingham model relationship either in the range of the shear rate increase interval data or the shear rate decrease interval data.The shear stress and the apparent viscosity increase with the increase of loess ratio at the same shear rate.We proposed to use the fine particle material(loess,cement and fly ash) and aggregate(aeolian sand) mass ratio to determine the rheological properties of the filling material.The greater the fine particle material and aggregate mass ratio,the smaller the yield stress,plastic viscosity and thixotropy,the better the slurry fluidity.
作者
王晓东
许刚刚
朱世彬
武博强
袁克阔
WANG Xiaodong;XU Ganggang;ZHU Shibin;WU Boqiang;YUAN Kekuo(China Coal Technology & Engineering Group X i ' an Research Institute, Xi ' an 710077, China)
出处
《煤矿安全》
北大核心
2017年第12期57-62,共6页
Safety in Coal Mines
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)
关键词
采空区
高浓度充填浆液
胶骨比
流变特性
充填材料
goaf
high concentration filling slurry
binder-aggregate ratio
rheological properties
filling material