人民长江2024，Vol.55Issue(2)：195-202,8.DOI:10.16232/j.cnki.1001-4179.2024.02.025
三轴加卸载下混凝土损伤特性及抗渗性能研究
Study on damage characteristics and impermeability of concrete under triaxial loading and unloading
摘要
Abstract
The concrete linings of underground river-crossing tunnels bear the cyclic load of vehicles during its service,which leads to different degrees of mechanical damage in concrete linings,thus weakens the impermeability of concrete lining.Therefore,the triaxial cyclic loading and unloading test was carried out for high performance concrete.The evolution of the deformation and mechanical properties,mechanical damage characteristics and impermeability of high performance concrete in the whole process of triaxial cyclic loading and unloading were studied.The results show that:①The mechanical damages of concrete caused by cyclic loading and unloading increase with the increase of cycles,and it shows a good exponential evolution relationship with the plastic strain.②The evolution of concrete permeability under cyclic loading and unloading can be divided into three stages:stable peri-od,rapid growth period and slow change period.Among them,the confining pressure level has an obvious influence on the first stage and the third stage.③The three-stage evolution law between permeability and mechanical damage of concrete can be well described by Logistic empirical model,and both of them decrease with the augmenting of confining pressure.The research results are helpful to understanding the evolution mechanism of impermeability and mechanical damage of high performance concrete in the whole process of triaxial cyclic loading and unloading,and provide a reference for determining the mechanical damage and im-permeability of concrete structures under different stress levels.关键词
高性能混凝土/力学性能/抗渗性能/力学损伤/损伤演化模型/经验模型Key words
high performance concrete/mechanical property/impermeability/mechanical damage/damage evolution model/em-pirical model分类
建筑与水利引用本文复制引用
杨福见,滕茂,宋秋强,丁祥..三轴加卸载下混凝土损伤特性及抗渗性能研究[J].人民长江,2024,55(2):195-202,8.基金项目
国家自然科学基金项目(52179114) （52179114）
