吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (6): 1782-1789.doi: 10.13229/j.cnki.jdxbgxb.20220355

• 交通运输工程·土木工程 • 上一篇    

级配碎石基层结构动力响应模型测试及数值分析

李崛1,2(),张安顺1,张军辉1(),钱俊峰3   

  1. 1.长沙理工大学 特殊环境道路工程湖南省重点实验室，长沙 410114
    2.重庆交通大学 交通运输学院，重庆 400074
    3.澳大利亚蒙纳士大学 土木工程系，克莱顿 VIC 3800，澳大利亚
  • 收稿日期:2023-01-31 出版日期:2023-06-01 发布日期:2023-07-23
  • 通讯作者: 张军辉 E-mail:lijue1207@cqjtu.edu.cn;zjhseu@csust.edu.cn
  • 作者简介:李崛（1992-），男，副教授，博士.研究方向：特殊土路基设计与处治.E-mail：lijue1207@cqjtu.edu.cn
  • 基金资助:
    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)

Model testing and numerical analysis of dynamic response of graded crushed rock base structure

Jue LI1,2(),An-shun ZHANG1,Jun-hui ZHANG1(),Jun-feng QIAN3   

  1. 1.Key Laboratory of Special Environment Road Engineering of Hunan Province，Changsha University of Science & Technology，Changsha 410114，China
    2.College of Traffic & Transportation，Chongqing Jiaotong University，Chongqing 400074，China
    3.Department of Civil Engineering，Monash University，Clayton VIC 3800，Australia
  • Received:2023-01-31 Online:2023-06-01 Published:2023-07-23
  • Contact: Jun-hui ZHANG E-mail:lijue1207@cqjtu.edu.cn;zjhseu@csust.edu.cn

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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。

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

Abstract:

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.

Key words: road engineering, graded crushed rock, model test, finite element method, cross-anisotropy

中图分类号: 

  • U416.1

图1

横观各向同性模型示意图"

图2

室内路面结构测试模具"

图3

路面结构和传感器布置"

图4

动土压力盒的应力变化"

图5

加铺层厚对应力的影响"

图6

行车速度对竖向位移的影响"

图7

材料模型子程序计算过程"

表1

级配碎石的材料参数"

序号材料参数数值
1模型参数k11.121
2模型参数k20.48
3模型参数k3-0.037
4各向异性系数gn0.500
5各向异性系数gm0.298
6竖向泊松比μ130.259
7水平泊松比μ330.518
8上覆层密度ρ2300
9水平应力系数K00.9
10最小允许模量Emin3.00E+07
11计算阻尼系数λ0.95

图8

PFWD下碎石层竖向应力分布"

图9

竖向应力随加载时间的变化"

图10

有限元与传感器的应力误差"

图11

加载时间对竖向位移的影响"

图12

加载速度对基层位移的影响"

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