沙漠砂可发性聚苯乙烯混凝土的蠕变特性及其本构模型  

Creep Characteristics and Constitutive Model of Desert Sand Expandable Polystyrene Concrete

作　　者：牛晟 康亚明[1,2] 陈静波 刘鹏 NIU Cheng;KANG Yaming;CHEN Jingbo;LIU Peng(Chemical Science and Engineering College,,North Minzu University,Yinchuan 750021,Ningxia,China;Key Laboratory of Chemical Engineering and Technology,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,Ningxia,China;Ningxia Qiangong Prestressing Technology Engineering Limited Company,Yinchuan 750200,Ningxia,China;Ningxia Hengcheng Construction Engineering Consulting Co.,Ltd.,Yinchuan 750001,Ningxia,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]宁夏千弓预应力技术工程有限公司,宁夏银川750200 [4]宁夏恒诚建设工程咨询有限公司,宁夏银川750001

出　　处：《济南大学学报（自然科学版）》2020年第6期543-547,共5页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51569001,51369001)。

摘　　要：针对沙漠砂可发性聚苯乙烯混凝土应用于路基及边坡工程时受力多处于压应力且当前尚无相关研究的情况,采用分级加载方式,研究沙漠砂可发性聚苯乙烯混凝土在轴向压应力状态下的蠕变特性,建立相关的本构模型。结果表明:沙漠砂可发性聚苯乙烯混凝土在不同应力水平下的蠕变曲线表现较相似,在低应力作用下蠕变曲线表现出较明显的衰减蠕变特征,随着应力的逐渐增大,蠕变曲线开始更多地呈现出稳态蠕变特征;试块蠕变应变主要由瞬时应变及蠕变量组成,轴向瞬时应变及总应变随应力的增大而增大,蠕变量与蠕变比随应力的增大而总体呈现先减小、后增大的趋势;等时应力-应变曲线显示,沙漠砂可发性聚苯乙烯混凝土呈现较明显的非线性黏弹性特征,六参量Burgers模型可对该特性进行较好地描述。In view of the fact that the desert sand expandable polystyrene concrete was mostly under compressive stress when applying to subgrade and slope engineering,and there was no relevant research at present,creep characteristics of the desert sand expandable polystyrene concrete under axial compressive stress state were studied by using the graded loading mode.The related constitutive model was established.The results show that creep curves of the desert sand expandable polystyrene concrete are similar under different stress values.At low stress levels,the creep curves show obvious attenuation creep characteristics.With the gradual increase of the stress,the creep curves begin to exhibit more steady creep characteristics.The creep strain of the concrete mainly consists of instantaneous strains and creep variations.The axial transient strain and total strain increase with the increase of the stress.The creep variation and creep ratios generally decrease first and then increase with the increase of the stress.The isochronous stress-strain curves indicate that the desert sand expandable polystyrene concrete exhibits obvious nonlinear viscoelastic characteristics,and the six-parameter Burgers model can better describe the creep characteristics.

关 键 词：沙漠砂可发性聚苯乙烯混凝土 本构模型 分级加载 蠕变 

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