玻璃纤维珊瑚海水混凝土三轴受压力学性能试验  

Investigation on triaxial compressive mechanical properties of glass fiber coral seawater concrete

作　　者：潘明棪 李星宇 刘磊果 覃龙寿 梁莹 陈宗平[1,3] PAN Mingyan;LI Xingyu;LIU Leiguo;QIN Longshou;LIANG Ying;CHEN Zongping(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;College of Architecture and Civil Engineering,Nanning University,Nanning 530200,China;Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

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

出　　处：《复合材料学报》2023年第6期3459-3472,共14页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金项目(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);国家级大学生创新创业训练计划项目(202110593069)。

摘　　要：为研究玻璃纤维珊瑚海水混凝土的三轴受压力学性能,以围压值和纤维掺量为变化参数,对36个圆柱体试件进行常规三轴试验。试验观察了试件的破坏形态,获取了其应力-应变全过程曲线;基于试验数据深入分析了变化参数对其各项力学性能的影响规律。结果表明:随着围压值的增大,破坏形态由竖向劈裂转为斜向剪切和挤压流动破坏,应力-应变曲线峰值增大、峰点后曲线平缓,其初始弹性模量、峰值应变、峰值应力、能量耗散均增大,而延性系数先增后降,当围压值为6 MPa时,延性系数分别为其单轴受压状态下的3.64倍、3.32倍、2.86倍;随着纤维掺量的增大,其初始弹性模量、延性系数、峰值应力、能量耗散均先增后降,而峰值应变先降后增,当玻璃纤维掺量为4 kg·m^(−3)时,其平均弹性模量达到5.83 GPa,相比其他两种掺量,其平均延性系数分别增长了3.0%、16.7%,平均峰值应力增长了9.6%;侧向围压与外掺玻璃纤维均可降低损伤发展的速率和程度。In order to study the triaxial compressive mechanical properties of glass fiber coral seawater concrete,36 glass fiber coral seawater concrete cylindrical specimens were subjected to conventional triaxial loading tests.The damage morphology of the specimens was observed,and the stress-strain curves were obtained.Based on the test data,the influence of the surrounding pressure value and glass fiber admixture on the mechanical properties was analyzed.The results show that the damage pattern changes from vertical splitting to oblique shear and central extrusion flow damage as the surrounding pressure increases.The slope of the rising section of the stress-strain curve increases,the peak section increases,and the falling section after the peak point gradually disappears,and the corresponding initial elastic modulus,peak strain,peak stress and energy dissipation increase,while the ductility coefficient shows a trend of first increasing and then decreasing,when the confining pressure value is 6 MPa,the ductility coefficients are 3.64 times,3.32 times and 2.86 times respectively in the uniaxial pressure state.The average values of modulus of elasticity,ductility coefficient,peak stress and energy dissipation all show a trend of increasing and then decreasing,while the average peak strain shows a trend of decreasing and then increasing,when the glass fiber dosage is 4 kg·m^(−3),the average modulus of elasticity reaches 5.83 GPa,which increases the average ductility coefficient by 3.0%and 16.7%and the average peak stress by 9.6%compared with the other two dosages.The lateral surrounding pressure and external glass fiber doping can reduce the development speed and degree of damage,and the lateral surrounding pressure can also delay the appearance of initial damage.

关 键 词：珊瑚海水混凝土 三轴受压 玻璃纤维 力学性能 损伤分析 

分 类 号：TU528[建筑科学—建筑技术科学] TB333[一般工业技术—材料科学与工程]