摘要
为了理解级配碎石的真实响应,开展了级配碎石基层的室内模型测试和数值分析。根据横观各向同性理论,建立了级配碎石模量的力学-经验模型;通过室内模型试验,分析了级配碎石不同位置的应力和变形规律,并提出了级配碎石的有限元计算方法。测试及数值分析结果表明:级配碎石内部的应力变化具有显著的横观各向同性特征;不同车速下荷载作用时间和层顶位移峰值不同;有限元计算结果与室内模型测试规律基本一致,但在设计时偏于保守。
To understand the actual dynamic response of graded crushed rock(GCR),the laboratory model testing and numerical analysis of GCR base layer were performed.First,based on the cross-anisotropy theory,a mechanical-empirical model for elastic modulus of GCR was established.Then,the stress and deformation laws at different positions of GCR structure were analyzed through laboratory model test.Finally,a novel calculation approach of finite element model was proposed for GCR base layer.The results of model testing and numerical analysis show that changes of stress in the GCR structure present a significant cross-anisotropy characteristic.The loading time and peaking displacement at the top of GCR layer are closely related to vehicle speed.The calculation results of finite element model are basically consistent with the trend of laboratory model test,but it is still conservative in pavement design.
作者
李崛
张安顺
张军辉
钱俊峰
LI Jue;ZHANG An-shun;ZHANG Jun-hui;QIAN Jun-feng(Key Laboratory of Special Environment Road Engineering of Hunan Province,Changsha University of Science&Technology,Changsha 410114,China;College of Traffic&Transportation,Chongqing Jiaotong University,Chongqing 400074,China;Department of Civil Engineering,Monash University,Clayton VIC 3800,Australia)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2023年第6期1782-1789,共8页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金杰出青年项目(52025085)
国家自然科学基金青年项目(52208426)
特殊环境道路工程湖南省重点实验室开放基金重点项目(kfj210501).
关键词
道路工程
级配碎石
模型试验
有限元方法
横观各向同性
road engineering
graded crushed rock
model test
finite element method
cross-anisotropy
