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Influence of Subgrade Stiffness on Flexible Pavement Responses – A Case Study-Alexandria City, Egypt.

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Last updated: 04 Jan 2025

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Tags

Public Works Engineering

Abstract

Alexandria city lies at the north of Egypt on the Mediterranean Sea. The top layers of soil in Alexandria differs from bed rock (Borg El-Arab), sand (near the sea, north Abo-Qir street) to silt and clay (Elsyouf, Smouha, Khorshed, etc..). Thus, a great attention should be considered in the design of pavements on these dissimilar subgrades because the performance of a pavement depends on the quality of its subgrade and subbase layers.
The non-linear finite element program MICHPAVE is used in this study to analyze the flexible pavement responses. Displacements, stresses and strains are computed only within the region modeled by finite elements. At the end of the analysis, MICHPAVE outputs an equivalent resilient modulus for each pavement layer. Results from the non-linear mechanistic analysis, together with other parameters, are used as input to two performance models, to predict the fatigue life and rut depth. These performance models are currently restricted to three-layer pavements with asphalt concrete (AC) surface, base and roadbed soil, and four-layer pavements with AC surface, base, subbase and roadbed soil.
Analysis of research results has shown that using a reasonable subbase layer reduces the rut depth of pavement while the increase in subbase thickness causes increase in rutting. Total expected rut depth of pavement as well as expected rut depth in the asphalt course increase with the decrease of subgrade stiffness, while fatigue life of pavement increases with the increase of subgrade stiffness

DOI

10.21608/bfemu.2020.96398

Keywords

Subgrade, Rutting depth, Axle loads, Fatigue damage, Finite Element, MICHPAVE

Authors

First Name

Saad

Last Name

El-Hamrawy

MiddleName

-

Affiliation

Prof. of Highway Eng., Pharos University, Alexandria, Egypt

Email

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City

-

Orcid

-

First Name

Ragaa

Last Name

Abd El-Hakim

MiddleName

Talaat

Affiliation

Assistant professor, Public Works Engineering Department, Faculty of Engineering, Tanta University

Email

ragaa.abdelhakim@f-eng.tanta.edu.eg

City

-

Orcid

0000-0003-4148-6855

Volume

40

Article Issue

5

Related Issue

14486

Issue Date

2015-12-01

Receive Date

2016-01-04

Publish Date

2021-12-01

Page Start

49

Page End

56

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 40_Issue 5_Pages 49-56.pdf

PDF . 783.5kB

Link

https://bfemu.journals.ekb.eg/article_96398.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=96398

Order

21

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Influence of Subgrade Stiffness on Flexible Pavement Responses – A Case Study-Alexandria City, Egypt.

Details

Type

Article

Created At

22 Jan 2023