基于正交试验充填体力学性能及配比优化研究  

Study on Mechanical Properties and Ratio Optimization of Backfill Based on Orthogonal Test

作　　者：张友锋 付玉华 ZHANG Youfeng;FU Yuhua(School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Gannan University of Science and Technology,Ganzhou 341000,China;Key Laboratory of Mining Engineering in Jiangxi Province,Ganzhou 341000,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]赣南科技学院,江西赣州341000 [3]江西省矿业工程重点实验室,江西赣州341000

出　　处：《有色金属工程》2021年第10期114-122,共9页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51464015)。

摘　　要：针对矿山充填开采成本较高、尾砂和废石等固废处置困难等问题,以废石、尾砂为试验材料,通过正交试验法确定质量浓度、灰砂比及废石掺量对粗骨料胶结充填体流动性及力学性能的影响规律,并确定合理的配比参数。结果表明:质量浓度、废石掺量及灰砂比均为充填料浆坍落度的显著性影响因素,其中质量浓度的影响最为关键;方差分析结果表明,质量浓度、灰砂比能够对充填体3 d及28 d抗压强度有显著性影响,而当废石掺量为5%~20%时,废石掺量对粗骨料充填体抗压强度无显著性影响;多元线性回归模型能够准确地反映出粗骨料胶结充填体抗压强度及坍落的变化规律,且构建三维可视化模型能够直观反映出质量浓度、灰砂比及废石掺量的复合作用对充填体性能的影响;基于建立的充填体配比参数寻优模型可得出一组合理的配比参数为:灰砂比为1∶9.5、质量浓度为80%、废石掺量为20%。Aiming at the problems of high mining cost and difficulty in disposal of solid wastes such as waste rocks and tailings,waste rock and tailings are used as experimental materials to determine influence laws of the mass concentration,cement sand ratio and waste rock content on the fluidity and mechanical properties of the coarse aggregate cemented backfill by orthogonal test.In addition,the reasonable ratio parameters are determined.The results show that:Mass concentration,waste rock content and cement sand ratio are all significant factors affecting filling slurry slump,and the influence of mass concentration is the most critical.The results of variance analysis show that the mass concentration and cement sand ratio can significantly affect the 3 d and 28 d compressive strength of the backfill,while the content of waste rock has no significant effect on the compressive strength of coarse aggregate filling when the content of waste rock is 5%-20%.The multiple linear regression model can accurately reflect the variation law of compressive strength and slump of coarse aggregate cemented backfill,and the construction of three-dimensional visualization model can directly reflect the combined effect of mass concentration,cement sand ratio and waste rock content on the performance of backfill.Based on the established optimization model of backfill proportioning parameters,a set of reasonable proportioning parameters can be obtained:The cement sand ratio is 1∶9.5,the mass concentration is 80%,and the content of waste rock is 20%.

关 键 词：粗骨料 单轴抗压强度 坍落度 离析率 多元线性回归 

分 类 号：TD853.34[矿业工程—金属矿开采]