珊瑚海水海砂混凝土三轴力学性能  

Triaxial Mechanical Properties of Coral Seawater Sea Sand Concrete

作　　者：陈宇良[1,2,3] 李培泽 陈宗平 CHEN Yuliang;LI Peize;CHEN Zongping(School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;Key Laboratory of Disaster Prevention&Mitigation and Prestress Technology of Guangxi Colleges and Universities,Liuzhou 545006,Guangxi,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety,Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]广西高校防灾减灾与预应力技术重点实验室,广西柳州545006 [3]广西大学工程防灾与结构安全教育部重点试验室,南宁530004

出　　处：《硅酸盐学报》2023年第11期2814-2823,共10页Journal of The Chinese Ceramic Society

基　　金：中国博士后科学基金(2021M693854);八桂学者专项经费资助项目([2019]79);广西研究生教育创新计划项目(YCSW2023474)。

摘　　要：为研究珊瑚海水海砂混凝土的三轴力学性能,通过常规三轴试验研究了不同骨料组合与侧向围压对试件破坏形态、应力-应变曲线、屈服应力、屈服应变及损伤演变的影响规律。结果表明:珊瑚粗骨料试件更易受围压值影响,在9MPa的围压值下试件表面出现裂缝形式转变与塑性流动,在12 MPa的围压值下其应力-应变曲线出现“应力平台段”,碎石粗骨料试件则分别在15 MPa与24 MPa的围压值下出现上述变化;在围压值达到15 MPa后,珊瑚粗骨料试件的应力-应变曲线呈现具有第二线性分支的双线性形状;随着围压值增加,试件的屈服应力、屈服应变及耗散能均逐渐提高,损伤发展逐渐延缓。最后,提出了珊瑚海水海砂混凝土的屈服应力计算式,可为相关理论分析与工程应用提供借鉴。To analyze the triaxial mechanical properties of coral seawater sea sand concrete,the effects of aggregate and lateral confining pressure on the failure mode,stress-strain curve,yield stress,yield strain,and damage evolution of specimens were investigated via conventional triaxial tests.The results show that the coral coarse aggregate specimen is more susceptible to the influence of confining pressure value.The cracks form transformation and plastic flow appear on the surface of the specimen at a confining pressure value of 9 MPa.The stress-strain curve appears a stress platform section'at a confining pressure value of 12 MPa,while the gravel coarse aggregate specimen appears the above changes at confining pressure values of 15 MPa and 24 MPa,respectively.After a confining pressure value reaches 15 MPa,the stress-strain curve of the coral coarse aggregate specimen shows a bilinear shape with a second linear branch.The dissipation energy of the specimens gradually increases and the damage development gradually delays with the increase of confining pressure,yield stress and yield strain.In addition,the yield stress calculation formula of coral seawater sea sand concrete was aslo proposed,thus providing a reference for the relevant theoretical analysis and engineering application.

关 键 词：珊瑚海水海砂混凝土 三轴受压 应力–应变曲线 能量耗散 损伤分析 

分 类 号：TU528[建筑科学—建筑技术科学]