摘要
本文以纤维体积率和围压为研究变量,基于24组试件的受压试验,研究了高水胶比PVA-FRCC材料在单轴受压与三轴受压之下的强度特性.研究结果表明:掺加纤维后水泥基材破坏时的完整性提高,但随纤维掺量增大,PVA-FRCC的单轴与三轴抗压强度均降低;随围压增大,PVA-FRCC的三轴抗压强度提高,且纤维体积率较小时强度提高幅度较大,反之则较小.文章最后提出了修正的Mohr-Coulomb破坏准则和Willam-Warnke五参数破坏准则,分别用于描述PVA-FRCC三轴抗压强度与单轴抗压强度,以及三轴受压抗剪强度与平均正应力之间的关系,准则计算结果与试验结果吻合较好.
The strength characteristics of PVA-FRCC with high water-binder ratio under uniaxial compression and triaxial compression were studied based on the compression tests of 24 groups of specimens with different fiber volume ratios and confining pressures.The results show that the strength of PVA-FRCC with high water-binder ratio is lower than that of PVA-FRCC with low water-binder ratio.The uniaxial and triaxial compressive strengths of PVA-FRCC decrease with the increase of fiber content.With the increase of confining pressure,the triaxial compressive strength of PVA-FRCC increases,and the increase is greater when the fiber volume ratio is smaller,and less when the fiber volume ratio is larger.The modified Mohr-Coulomb failure criterion and the five-parameter William-Warnke failure criterion are proposed to describe the relationship between the triaxial compressive strength and the uniaxial compressive strength and the relationship between the triaxial compressive shear strength and the mean normal stress of PVA-FRCC,respectively.The calculated results are in good agreement with the experimental results.
作者
云泽亚
郝贠洪
刘曙光
王玉清
张亚乐
YUN Ze-ya;HAO Yun-hong;LIU Shu-guang;WANG Yu-qing;ZHANG Ya-le(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Mining and Technology,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《内蒙古工业大学学报（自然科学版）》
2021年第5期371-378,共8页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
国家自然科学基金项目(51968056,51768051)
内蒙古自治区科技成果转化项目(2019CG072)
国家级大学生创新创业训练计划项目(202010128006)。
关键词
PVA-FRCC
高水胶比
单轴受压
三轴受压
强度特性
PVA-FRCC
High water binder ratio
Uniaxial compression
Triaxial compression
Strength characteristic
