摘要
Abstract
To reveal the fatigue characteristics of subgrade and building foundation materials under cyclic loading,this study focused on granite crushed stone-silty clay mixture(7∶3)and silty clay-cement stabilized material(95∶5)as research objects.Using an MTS electro-hydraulic servo fatigue testing machine,industrial CT,and digital image correlation technology,cyclic loading tests and macro-micro analyses were conducted under different stress levels.The results show that the fatigue life of both materials significantly decreases with increasing stress level.The foundation reinforcement material exhibits better fatigue stability due to its low porosity and cementitious bonding.The cumulative plastic deformation evolves in"three stages"and micro-damage initiates from pore expansion or weak cementation areas.The initial porosity and damage propagation rate have a significant impact on macroscopic fatigue life.This study provides data support and theoretical reference for the design and durability assessment of geotechnical engineering structures.关键词
循环荷载/路基混合料/地基加固材料Key words
Cyclic loading/Subgrade mixture/Foundation reinforcement materials分类
建筑与水利
