混合骨料充填体强度发展规律与配比优化  

Strength Development Law and Proportion Optimization of Mixed Aggregate Backfill

作　　者：杨金维 寇永渊[1] 王瑛 YANG Jinwei;KOU Yongyuan;WANG Ying(Jinchuan Group Co.,Ltd.,Jinchang,Gansu 737102,China;Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]金川集团股份有限公司,甘肃金昌市737102 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《矿业研究与开发》2022年第10期35-39,共5页Mining Research and Development

基　　金：国家重点研发计划项目(2018YFC1900603).

摘　　要：混合骨料充填体强度受混合骨料配比、充填料浆质量分数和水泥掺量等多因素影响。为探究不同因素对充填体强度的影响规律,并确定最佳充填配合比,采用Box-Behnken响应面法(RSM-BBD)开展了混合骨料充填配合比试验。以河砂占比、料浆浓度和水泥掺量作为影响因素,以充填体7 d、14 d和28 d强度值作为响应量,构建了不同养护龄期的充填体强度试验回归模型。试验结果表明:混合骨料堆积密实度随着河砂占比增大先增大后减小,充填体强度亦表现出了相同的发展趋势。在多因素影响下,河砂占比越大同时料浆质量分数越小时,充填体强度越低;河砂占比越小同时水泥掺量越大时,充填体强度越高;充填体强度随着水泥掺量和料浆质量分数的提高而增大。The strength of mixed aggregate backfill is affected by many factors such as the ratio of mixed aggregate,the concentration of filling slurry and the cement content.In order to explore the influence of different factors on the strength of backfill and determine the optimal mix proportion,RSM-BBD method was used to carry out the mix proportion experiment of mixed aggregate.Taking the proportion of river sand,slurry concentration and cement content as the influencing factors and the strength values of backfill at 7 d,14 d and 28 d as the response quantities,the strength regression model of backfill at the corresponding curing age was constructed.The results show that the packing density of mixed aggregate first increases and then decreases with the increase of the proportion of river sand,and the strength of backfill also shows the same development trend.Under the influence of many factors,the greater the proportion of river sand is and the smaller the slurry concentration is,the lower the strength of backfill is.The smaller the proportion of river sand is and the greater the cement content is,the higher the strength of backfill is.The strength of backfill increases with the increase of cement content and slurry concentration.

关 键 词：胶结充填体 混合骨料 堆积密实度 充填配合比 回归模型 

分 类 号：TD853.343[矿业工程—金属矿开采]