中南大学学报（自然科学版）2024，Vol.55Issue(3)：1008-1022,15.DOI:10.11817/j.issn.1672-7207.2024.03.015
不同建筑固废再生骨料取代率下粗粒土填料永久变形特性及安定行为研究
Permanent deformation characteristics and shakedown behavior of coarse-grained fill materials incorporating different proportions of aggregates recycled from building demolition wastes
摘要
Abstract
In order to address the feasibility of the mixed subgrade filling of natural aggregate and recycled aggregates from construction and demolition waste(RAW),laboratory static/dynamic triaxial tests under different conditions of recycled aggregate replacement rate,moisture content,confining pressure and shear stress ratio were carried out,and the effect of index properties and stress states on the shear strength and accumulative plastic strain characteristics of the specimen were explored.Based on the multi-stage characteristics of plastic strain development under semi-logarithmic coordinates,and considering the plastic deformation accumulation rate at different stages and the difference in plastic deformation accumulation rate in adjacent two stages,a new shakedown behavior determination criterion suitable for subgrade filling mixed with RAW was proposed.The results show that the accumulative plastic strain of the specimen increases with the increase of moisture content and shear stress ratio,and the specimens mixed with RAW show similar plastic deformation resistance ability compared to natural aggregate when the shear stress ratio is 0.3 and 0.5.After comprehensive comparative analysis of strength and deformation characteristics,it is recommended to use recycled aggregate subgrade filled with 85%replacement rate.The new shakedown behavior determination criterion has high accuracy and can provide a theoretical basis for the long-term pavement performance evaluation of similar subgrade fillings.关键词
道路工程/建筑固废/再生骨料/永久变形/安定行为Key words
road engineering/construction and demolition waste/recycled aggregates/permanent deformation/shakedown behavior分类
建筑与水利引用本文复制引用
肖源杰,王政,AMINU Umar Faruk,王萌,李昀博,孔坤锋,陈宇亮,周震,李志勇..不同建筑固废再生骨料取代率下粗粒土填料永久变形特性及安定行为研究[J].中南大学学报（自然科学版）,2024,55(3):1008-1022,15.基金项目
国家自然科学基金资助项目(52178443) （52178443）
国家重点研发计划项目(2019YFC1904704) （2019YFC1904704）
交通运输部重点科技项目(2022-MS5-122) （2022-MS5-122）
中南大学研究生自主探索创新项目(2023ZZTS0019)(Project(52178443)supported by the National Natural Science Foundation of China （2023ZZTS0019）
Project(2019YFC1904704)supported by the National Key Research&Development Program of China （2019YFC1904704）
Project(2022-MS5-122)supported by the Ministry of Transport Key Science&Technology Program of China （2022-MS5-122）
Project(2023ZZTS0019)supported by the Graduate Student Free Exploration Innovation Program of Central South University) （2023ZZTS0019）
