三轴应力下卵石混凝土力学性能与本构关系  

Mechanical Properties and Constitutive Relation of Pebble Concrete under Tri-axial Stress

作　　者：陈宇良[1,2] 吉云鹏 陈宗平 刘杰 晏方[1] CHEN Yuliang;JI Yunpeng;CHEN Zongping;LIU Jie;YAN Fang(College of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]华南理工大学土木与交通学院,广东广州510641 [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：《建筑材料学报》2022年第1期31-36,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51908141);中国博士后科学基金资助项目(2021M693854);广西科技基地和人才专项项目(AD19110068);广西重点实验室开放课题资助项目(2019ZDK038);广西科技大学博士基金资助项目(校科博18Z09)。

摘　　要：为研究卵石混凝土的三轴受压力学性能,进行了27个卵石混凝土试件的常规三轴试验,观察了试件的破坏形态,获取了其应力-应变全过程曲线及特征点参数,深入分析了围压对卵石混凝土力学性能的影响.结果表明:随着围压的增大,卵石混凝土试件破坏形态先由轴向劈裂破坏转变为斜向剪切破坏,再转变为横向剪切破坏;围压越大,峰值应力、峰值应变、初始模量越大,峰值应力后其应力-应变全过程曲线越平缓;提出的卵石混凝土三轴受压时相关力学指标计算公式及参数化本构方程的计算结果与试验结果拟合良好.In order to study the mechanical properties of pebble concrete under tri-axial compression,the conventional tri-axial test of 27 pebble concrete specimens were carried out.The failure patterns of specimens were observed,the whole stress-strain curves and their characteristic point parameters were obtained.The influence of confining pressure on the mechanical properties of pebble concrete was deeply analyzed.The results show that with the increase of confining pressure,the failure pattern of pebble concrete specimens changes from axial splitting failure to oblique shear failure,and then to transverse shear failure.The greater the confining pressure,the greater the peak stress,peak strain and initial elastic modulus,and the smoother and plumper the whole stress-strain curve after the peak stress.The calculation formula of mechanical indexes and parametric constitutive equation of pebble concrete under tri-axial compression are proposed,and the calculated results fit well with the test results.

关 键 词：卵石混凝土 三轴受压 力学性能 本构关系 

分 类 号：TU528.01[建筑科学—建筑技术科学]