基于正交试验的充填体力学及微观特性研究  

Mechanical performances and microscopic properties of cemented backfilling based on orthogonal experiment

作　　者：许茜[1,2] 王彦明 张雯超 XU Qian;WANG Yanming;ZHANG Wenchao(School of Civil Engineering,Nantong Vocational University,Nantong 226007,China;Geotechnical and Structural Engineering Research Center of Shandong University,Ji'nan 250061,China;School of Rail Transportation,Soochow University,Suzhou 215006,China)

机构地区：[1]南通职业大学建筑工程学院,江苏南通226007 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]苏州大学轨道交通学院,江苏苏州215006

出　　处：《采矿与岩层控制工程学报》2022年第6期86-94,共9页Journal of Mining and Strata Control Engineering

基　　金：江苏省建设系统科技计划资助项目(2017ZD062);2020年江苏高校“青蓝工程”培养资助项目(20200414)。

摘　　要：针对粉煤灰、水泥掺量及料浆质量浓度3种因素对粉煤灰-废石胶结充填体力学性能的影响,进行正交试验设计。通过对粉煤灰-废石胶结充填体抗压、抗拉强度进行极差和方差分析,得到3种因素对充填体抗压、抗拉强度的影响程度和显著性影响因素。通过扫描电镜显微镜(SEM)对粉煤灰-废石胶结充填体的微观结构进行扫描并分析。试验结果表明:3种因素均为充填体早期抗压强度的显著性影响因素,而其后期抗压强度的显著性影响因素只有水泥掺量,在养护龄期为3,7,28d时,对充填体抗压强度影响程度为:料浆质量浓度>粉煤灰掺量>水泥掺量;充填体抗拉强度的显著性影响因素只有水泥掺量和粉煤灰掺量,对充填体抗拉强度的影响程度为:水泥掺量>粉煤灰掺量>料浆质量浓度。充填体内部微观结构的致密性随着水泥掺量或料浆质量浓度的增加而提高,进而表现为充填体抗压、抗拉强度的提高。The orthogonal experiment was conducted to investigate the effects of fly ash,cement and mass concentrations on mechanical performances of cemented backfill with fly ash and mullock. By range and variance analysis of the compressive and tensile strength,the influence of the three factors on the compressive and tensile strength of the cemented backfill can be analyzed. The microstructure of cemented backfill with fly ash and mullock was observed by using the SEM. It is concluded that the three factors have significant influence on the compressive strength of cemented backfill at early age,and the dosage of cement is the dominant factor of the long-term compressive strength. At the curing ages of 3,7 and 28 d,the degree of influence on the compressive strength of the cemented backfill is as follows:Slurry mass concentration > fly ash admixture > cement admixture. The only significant factors influencing the tensile strength of the cemented backfill are the cement and fly ash admixture,and the degree of influence on the tensile strength of the filler is:Cement admixture > fly ash admixture > slurry mass concentration. The denseness of the internal microstructure of the cemented backfill increases with the mass of the cement admixture or slurry mass concentration,which in turn shows the increase of compressive and tensile strength of the cemented backfill.

关 键 词：胶结充填体 正交试验 微观结构 抗压强度 粉煤灰 

分 类 号：TD853[矿业工程—金属矿开采] TU458[矿业工程—矿山开采]