超细全尾砂胶结充填体的强度特征分析
一第36卷第1期一一一一一一一一一硅一酸一盐一通一报一一一一一一一Vol.36一No.1一2017年1月一一一一一一一BULLETIN OF THE CHINESE CERAMIC SOCIETY一一一一一January,2017一
超细全尾砂胶结充填体的强度特征分析
杨一磊,邱景平,范一凯,李一浩,胡世强
(东北大学资源与土木工程学院,沈阳一110819)
摘要:以中关铁矿全尾砂为充填骨料二水泥为胶凝材料制作胶结充填体,采用单因素四水平试验设计,分析了全尾砂的物理化学性质,探讨了全尾砂胶结充填体强度与灰砂比二料浆质量浓度和养护龄期之间的定量关系,并对其敏感程度进行了研究三研究结果表明:中关铁矿全尾砂中值粒径仅为14.2μm,碱度系数为2.31,活性系数为2.12,属于碱性超细全尾砂,级配良好二活性较高;全尾砂胶结充填体的强度随灰砂比的增加和料浆质量浓度的增加呈指数函数增长,随养护龄期的增加呈线性增长,拟合相关系数平均值分别为0.97二0.96和0.92;充填体强度对养护龄期的敏感程度最高,灰砂比次之,料浆质量浓度最小三
关键词:充填采矿法;超细全尾砂;胶结充填体;强度特征;定量关系
中图分类号:TD853.34+3一一文献标识码:A 一一文章编号:1001-1625(2017)01-0249-08
Analysis on Strength Characteristics of Super-fine Unclassified Tailiings Cemented Backfills
YANG Lei ,QIU Jing-ping ,FAN Kai ,LI Hao ,HU Shi-qiang
(School of Resources &Civil Engineering,Northeastern University,Shenyang 110819,China)一一一一一一Abstract :Cemented-tailing backfills were produced by taking unclassified tailings of Zhongguan Iron Mine as filling aggregate,and ordinary Portland cement as cementing agent.Physicochemical properties
of unclassified tailings were analyzed,quantitative relationships between backfill strength and cement-tailing ratio,slurry concentration,and curing age were discussed by using single-factor four-level experiment,and sensitivity of backfill strength to these factors were also studied.The results show that,unclassified tailings of test,whose median diameter,alkalinity coefficient and activity coefficient are 14.2μm,2.31and 2.12respectively,belongs to alkaline super-fine tailings with high activity.Strength of full tailings cemented backfill follows exponential function with cemented-tailing ratio and slurry concentration,but linear function with curing age,and the the corresponding correlation coefficients are 0.97,0.96and 0.92respectively.Sensitivity of backfill strength to curing age is the maximum,followed by cement-tailing ratio,and slurry concentration is the minimum.
Key words :filling method;super-fine unclassified tailings;cemented backfill;strength character;quantitative relation 基金项目: 十二五 国家科技支撑计划项目(2011BAB07B02,2012BAJ17B01,2012BAJ17B02)
作者简介:杨一磊(1993-),男,硕士研究生.主要从事充填采矿和资源综合利用研究.
通讯作者:邱景平,博士,副教授.1一引一言
自20世纪60年代以来,充填采矿法得到了迅速发展[1-3],该方法能有效提高矿产资源利用率二控制地表万方数据