Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (6): 1782-1789.doi: 10.13229/j.cnki.jdxbgxb.20220355

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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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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

CLC Number: 

  • U416.1

Fig.1

Schematic diagram of cross-anisotropy model"

Fig.2

Test mold for indoor pavement structure"

Fig.3

Pavement structure and sensor layout"

Fig.4

Stress changes of dynamic soil sensor"

Fig.5

Effect of layer thickness on stress"

Fig.6

Effect of traffic speed on vertical displacement"

Fig.7

Calculation process of material model subroutine"

Table 1

Material parameters of graded gravel"

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

Fig.8

Vertical stress distribution under PFWD test"

Fig.9

Vertical stress changes with loading time"

Fig.10

Stress difference between FEM and sensors"

Fig.11

Effect of loading time on vertical displacement"

Fig.12

Effect of speed on base layer displacement"

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