玄武岩纤维珊瑚海水混凝土三轴受压力学性能试验研究  

Experiment on mechanical properties of basalt fiber coral seawater concrete under triaxial compression

作　　者：区王生 庞云升 覃龙寿 莫琳琳 陈宗平 OU-WANG Sheng;PANG Yunsheng;QIN Longshou;MO Linlin;CHEN Zongping(College of Architecture and Civil Engineering,Nanning University,Nanning 530200,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]南宁学院土木与建筑工程学院,广西南宁530200 [2]广西大学土木建筑工程学院,广西南宁530004 [3]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《混凝土》2024年第8期72-78,101,共8页Concrete

基　　金：国家自然科学基金(51578163);广西八桂学者专项研究项目(2019【79】);广西科技基地和人才专项(桂科AD21075031);广西重点研发计划项目(2021AB31027)。

摘　　要：为研究玄武岩纤维珊瑚海水混凝土的三轴受压力学性能,以玄武岩纤维掺量和侧向围压值为变化参数,设计并制作了60个玄武岩纤维珊瑚海水混凝土试件进行三轴受压力学性能试验,观察了试件的破坏形态,获取了其应力-应变曲线,并对玄武岩纤维珊瑚海水混凝土的峰值点应力、峰值点应变、初始弹性模量、能量耗散与损伤演化过程进行了深入分析。结果表明:随侧向围压值的增大,试件破坏形态由竖向劈裂破坏依次向斜向剪切破坏、挤压流动破坏转变,应力应变曲线上升段斜率增大,下降段趋于平缓,各项性能指标均呈非线性上升;随玄武岩纤维掺量的增加,试件的峰值点应力、弹性模量与耗能指标先增后减,而峰值点应变先减后增,纤维体积掺量为0.25%时综合性能最优;侧向围压值的增大与玄武岩纤维的掺入均可减缓试件损伤发展的速率。In order to reveal the triaxial mechanical properties of basalt fiber coral seawater concrete,60 basalt fiber coral seawater concrete were designed for triaxial compression tests with the fiber admixture and the lateral confining pressure value as variation parameters.The damage morphology of the specimens was observed,and the stress-strain curves of specimens were obtained.The peak stress,peak strain,initial elastic modulus,energy dissipation and damage evolution process of basalt fiber all-coral seawater concrete were analyzed in depth.The test results show that with the increase of the lateral confining pressure,the failure mode of the specimen changes from vertical splitting failure to oblique shear failure and extrusion flow failure in turn,the slope of the rising section of the stress-strain curve increases,and the falling section tends to be gentle,and all the performance indicators shows nonlinear rise.With the increase of basalt fiber doping,the peak stress,elastic modulus and energy dissipation index of the specimen increased and then decreased,while the peak strain decreased and then increased,and the comprehensive performance was optimal when the fiber doping was 0.25%.Both lateral confining pressure and basalt fiber incorporation slowed the rate of damage development in the specimens.

关 键 词：玄武岩纤维 珊瑚海水混凝土 三轴受压 力学性能 损伤分析 

分 类 号：TU528.571[建筑科学—建筑技术科学]