沙漠砂可发性聚苯乙烯混凝土的应力-应变曲线及其本构模型  

Stress-Strain Curves and Constitutive Model of Desert Sand Expandable Polystyrene Concrete

作　　者：牛晟 康亚明[1,2] 周建民 陈静波 NIU Cheng;KANG Yaming;ZHOU Jianmin;CHEN Jingbo(Chemical Science and Engineering College,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China;Key Laboratory of Chemical Engineering and Technology,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China;Coal Mine Design and Research Institute,Shenhua Ningxia Coal Industry Group Corporation Energy Engineering Company,Yinchuan 750021,China;Ningxia Xuri Zhongli Environmental Protection Technology Co.,Ltd.,Yinchuan 750200,China)

机构地区：[1]北方民族大学化学与化学工程学院,宁夏银川750021 [2]北方民族大学国家民委化工技术基础重点实验室,宁夏银川750021 [3]神华宁煤集团公司能源工程公司煤矿设计研究院,宁夏银川750021 [4]宁夏旭日众粒环保科技有限公司,宁夏银川750200

出　　处：《济南大学学报（自然科学版）》2020年第1期22-29,共8页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51569001,51369001);北方民族大学校级重点项目(2017KJ16)

摘　　要：针对有关沙漠砂可发性聚苯乙烯(EPS)混凝土尚无相关研究的情况,分别对6组不同密度的沙漠砂EPS混凝土进行单轴压缩实验,并通过与常用普通混凝土本构模型进行对比评估及对数据进行拟合,得出适用于沙漠砂EPS混凝土的本构模型。结果表明:沙漠砂EPS混凝土初始加载时存在压密过程,峰后应力衰减至峰值应力的40%~60%后,应变以延性为主,并且存在多次压实-破坏过程;现有常用混凝土本构模型均与实验曲线存在一定区别,在未对其进行改进前并不适用沙漠砂EPS混凝土;所得的沙漠砂EPS混凝土本构模型与实验曲线贴合度较高,可较好地描述该材料的本构关系。In view of the lack of relevant research on desert sand expandable polystyrene(EPS)concrete,6 groups of desert sand EPS concrete with different densities were subjected to uniaxial compression experiments.Through the comparison and evaluation with the common ordinary concrete constitutive model and the fitting of data,the constitutive model suitable for desert sand EPS concrete was obtained.The results show that when the sand EPS concrete is initially loaded,there is a compaction process.After the post-peak stress decreases to 40%to 60%of the peak stress,the strain is dominated by ductility,and there are multiple compaction-failure processes.The existing constitutive model of common concrete is different from the experimental curve,it is not applicable to EPS concrete of desert sand before improvement.The obtained constitutive model of sand EPS concrete fits well with the experimental curve and can describe the constitutive relationship of materials.

关 键 词：沙漠砂可发性聚苯乙烯混凝土 单轴压缩 应力-应变曲线 本构模型 

分 类 号：TQ172[化学工程—水泥工业] TU528.79[化学工程—硅酸盐工业]