硅酸盐通报2024，Vol.43Issue(11)：4036-4046,4082,12.
含初始孔隙的堆石混凝土动态抗压性能研究
Dynamic Compressive Properties of Rock-Filled Concrete with Initial Pores
摘要
Abstract
Initial defects are identified as one of the root causes affecting the mechanical properties of concrete.In this paper,expanded polystyrene(EPS)particles were utilized to prefabricate initial defects of rock-filled concrete(RFC),and the defect content was quantified by porosity.Uniaxial compression tests of four porosities of RFC at four strain rates were systematically conducted,and the effects of strain rate and porosity on RFC failure modes,compressive strength,elastic modulus,and critical strain were studied.The results show that the RFC failure modes under different operating conditions are similar to the"hourglass"type.The compressive strength,elastic modulus and critical strain of RFC all have strain rate strengthening effect.As the porosity increases,the sensitivity of RFC compressive strength,elastic modulus,and critical strain to strain rate decreases.Compared with strain rate,the effect of porosity on compressive strength,elastic modulus,and critical strain of RFC is more significant.Additionally,based on the Sargin model,a dynamic constitutive model of RFC with initial pores is constructed.It is used to illustrate the mechanical behavior of RFC with initial pores at low strain rates.关键词
堆石混凝土/聚苯乙烯颗粒/单轴压缩/应变速率/孔隙率/本构模型Key words
rock-filled concrete/expanded polystyrene particle/uniaxial compression/strain rate/porosity/constitutive model分类
建筑与水利引用本文复制引用
余雷,乔浩洋,王国冀,刘云柯,任涛,杨韬..含初始孔隙的堆石混凝土动态抗压性能研究[J].硅酸盐通报,2024,43(11):4036-4046,4082,12.基金项目
国家自然科学基金(52069004) （52069004）
贵州省科学技术基金(黔科合基础-ZK[2021]一般293) （黔科合基础-ZK[2021]一般293）
