基于响应面法的膨胀性充填体强度演化规律及配比优化  

Research on the strength evolution law and ratio optimization of expansive backfill based on response surface methodology

作　　者：张敏哲 王贻明[1] 王志凯 王剑 杨世兴 ZHANG Minzhe;WANG Yiming;WANG Zhikai;WANG Jian;YANG Shixing(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;CC Tongsin Resources Ltd.,Beijing 100028,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]中冶集团铜锌有限公司,北京100028

出　　处：《工程科学学报》2024年第5期800-811,共12页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(52130404)。

摘　　要：针对某铁矿采场充填接顶率低和接顶效果差的问题,通过添加复合膨胀剂可实现采场主动接顶.采用响应面法,借助Design-Expert软件中的Box-Behnken design(BBD)方法,开展了膨胀性充填体强度配比试验,研究了料浆质量分数、胶固粉质量分数和复合膨胀剂质量分数对膨胀性充填体抗压强度的影响规律.结果表明,单一因素及各因素间交互作用对膨胀性充填体抗压强度均有显著影响,其中胶固粉质量分数影响最大,复合膨胀剂质量分数次之,料浆质量分数最小;料浆质量分数与胶固粉质量分数的交互作用对充填体的早、中期抗压强度影响最为显著,胶固粉质量分数与复合膨胀剂质量分数的交互作用对充填体的后期抗压强度影响最为显著.通过目标规划法确定了膨胀性充填体最优配比:料浆质量分数为69%,胶固粉质量分数为10%,复合膨胀剂质量分数为3×10^(-4).利用X射线衍射(XRD)和扫描电镜(SEM)分析发现,复合膨胀剂可使充填体的内部结构疏松而引起膨胀,提高充填接顶率.To address the challenges of low roof-contacted filling rates and poor roof-contacted filling effects in an iron mine stope in the Anhui province,a composite expansive agent is introduced into the last roof-contacted filling slurry.This approach allows for active roof-contacted filling and reduces filling costs simultaneously.This paper analyzes the physical and chemical properties of the test materials to assess the strength evolution law and determine the optimal ratio for expansive backfill.Herein,a response surface methodology(RSM)is employed for performing the strength ratio test of expansive backfill using Box-Behnken design(BBD)in Design-Expert software.Further,the influence rules of slurry mass fraction,cementitious powder mass fraction,and composite expansive agent mass fraction on the compressive strength of expansive backfill are studied.Subsequently,the paper establishes response surface regression models for analyzing the compressive strength of expansive backfill.The results show that the regression coefficients for 3 d,7 d,and 28 d compressive strength regression equations are 0.9813,0.9758,and 0.9857,respectively.These figures suggest that the regression models have a high degree of fitting.Further analysis of variance and comparison between measured and predicted values suggest the accuracy and reliability of these models.The results reveal that the compressive strength of expansive backfill is considerably affected not only by a single factor but also by the interaction between various factors.Among the single factors,cementitious powder mass fraction exerts the greatest influence,followed by composite expansive agent mass fraction,while slurry mass fraction has the least effect.The interaction between slurry mass fraction and cementitious powder mass fraction considerably affects the compressive strength during the early and middle stages.Meanwhile,the interaction between the cementitious powder mass fraction and composite expansive agent mass fraction substantially affects the later compressiv

关 键 词：复合膨胀剂 响应面法 抗压强度 配比优化 微观结构 

分 类 号：TD853.34[矿业工程—金属矿开采]