大掺量粉煤灰浆体充填材料流动特性研究
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摘要
为了保证浆体能安全顺利输送到矿井下,完成注浆充填工作,进行了大掺量粉煤灰浆体流动试验,探讨了浆体浓度、粉煤灰掺量、水泥掺量及煤矸石掺量等因素对浆体流动性的影响,并构建了流变本构模型对大掺量粉煤灰浆体流动特性进行分析。结果表明:浆体浓度为60%～70%时具有工作性;浆体流变模型属宾汉塑性模型;浆体浓度对流动性影响最大,其次为水泥掺量,粉煤灰掺量影响最小;τ0(初始剪切应力)与坍落度相关性好,呈负相关关系;大掺量粉煤灰浆体具有剪切稀化现象。
In order to ensure that the slurry could be safely and smoothly transported into the mine,and to complete the grouting filling work,the flow test of the slurry with large amount of fly ash was carried out.The influences of the influencing factors,such as slurry concentration,fly ash content,cement content and coal gangue content were discussed,and the rheological constitutive model was constructed to analyze the flow characteristics of slurry material with large amount of fly ash.The results were concluded as follows:Firstly,the slurry had workability when the slurry concentration was 60% to 70%.Secondly,the slurry rheological model belonged to the Bingham plastic model.Thirdly,the slurry concentration had the greatest influence on the fluidity,followed by the cement content and the fly ash content.τ0(initial shear stress)had a good negative correlation with slump.Finally,the slurry with large amount of fly ash had a shear thinning phenomenon.
In order to ensure that the slurry could be safely and smoothly transported into the mine,and to complete the grouting filling work,the flow test of the slurry with large amount of fly ash was carried out.The influences of the influencing factors,such as slurry concentration,fly ash content,cement content and coal gangue content were discussed,and the rheological constitutive model was constructed to analyze the flow characteristics of slurry material with large amount of fly ash.The results were concluded as follows:Firstly,the slurry had workability when the slurry concentration was 60% to 70%.Secondly,the slurry rheological model belonged to the Bingham plastic model.Thirdly,the slurry concentration had the greatest influence on the fluidity,followed by the cement content and the fly ash content.τ0(initial shear stress)had a good negative correlation with slump.Finally,the slurry with large amount of fly ash had a shear thinning phenomenon.
引文
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[24]李浩,刘音,路瑶,崔博强,郭皓.硫酸盐侵蚀对煤矿充填膏体强度影响的试验研究[J].矿业研究与开发,2018,38(3):77-82.
[2]钱鸣高,许家林,缪协兴.煤矿绿色开采技术[J].中国矿业大学学报,2003(4):5-10.
[3]王文龙,苏海健.我国煤炭开采技术现状与实例分析[J].中国高新技术企业,2012(3):162-163.
[4]石建新.浆体膨胀充填材料性能研究与应用[M].徐州:中国矿业大学出版社,2013.
[5]赵龙.浆体膨胀材料充填体的流变性能研究[D].淄博:山东理工大学,2015.
[6]张磊,吕宪俊,金子桥.粉煤灰在矿山胶结充填中应用的研究现状[J].矿业研究与开发,2011,31(4):22-25+129.
[7]刘浪.矿山充填膏体配比优化与流动特性研究[D].长沙:中南大学,2013.
[8]邹友平.煤矿采空区高掺量粉煤灰注浆扩散机理及应用[D].北京:煤炭科学研究总院,2016.
[9]刘音.建筑垃圾粗粉煤灰充填材料性能研究[M].郑州:黄河水利出版社,2015.
[10]林天埜.矸石似膏体充填料浆流动性能研究[D].北京:中国矿业大学(北京),2016.
[11]冯金,马昆林,龙广成.基于不同流变模型下粉煤灰对水泥净浆流变性能的影响[J].铁道科学与工程学报,2015,12(3):534-539.
[12]肖永生.粉煤灰充填材料管道输送特性及其应用研究[D].太原:太原理工大学,2016.
[13]Yun K K,Choi P,Yeon J H.Rheological characteristics of wet-mix shotcrete mixtures with crushed aggregates and mineral admixtures[J].Ksce Journal of Civil Engineering,2017(5):1-11.
[14]Dils J,Boel V,Schutter G D.Influence of cement type and mixing pressure on air content,rheology and mechanical properties of UHPC[J].Construction and Building Materials,2013,41(41):455-463.
[15]卫军.硷可泵性的流变分析[J].郑州工学院学报,1989(2):57-60.
[16]刘春原,庞云泽,左丽明,刘宇飞.碱渣-粉煤灰注浆材料强度影响因素的试验研究[J].四川建筑科学研究,2017,43(6):94-99.
[17]甘志超.煤矿采空区注浆充填材料电阻率影响因素试验研究[J].煤矿开采,2016,21(4):87-89+141.
[18]路阳,何小芳,吴永豪,王运霞,曹新鑫,卿培良.煤矿井下新型水泥基注浆材料的应用研究进展[J].硅酸盐通报,2014,33(1):97-102.
[19]槐衍森.可变浓度大掺量粉煤灰充填材料与流动规律研究[D].北京:中国矿业大学(北京),2017.
[20]王五松.膏体充填流变特性及工艺研究[D].阜新:辽宁工程技术大学,2004.
[21]逄鲁峰,袁惠星,李志明.高性能混凝土可泵性试验研究[J].混凝土,1998(2):11-14.
[22]曹志菲,郭浩.混凝土泵送性能的影响因素与试验评价方法分析[J].智能城市,2016,2(8):66.
[23]郑保才,周华强,何荣军.煤矸石膏体充填材料的试验研究[J].采矿与安全工程学报,2006(4):460-463.
[24]李浩,刘音,路瑶,崔博强,郭皓.硫酸盐侵蚀对煤矿充填膏体强度影响的试验研究[J].矿业研究与开发,2018,38(3):77-82.