NDLI: Evaluation of Finite Element, Finite Difference and Elasticity Methods for Hypothetical Raft Foundations Installed on Layered Strata

Content Provider	Springer Nature Link
Author	Omer, J. R. Arbabi, A.
Copyright Year	2015
Abstract	Different numerical methods including 2-D finite element (FE) analysis were implemented for hypothetical raft foundations of high length/breadth ratios to evaluate the reliability of (1) Boussinesq’s method, (2) “rigid-punch” (RP) elastic methods and (3) finite difference (FD) incorporating subgrade reaction theory. A dedicated computer program was developed and used in addition to professional software packages to analyse uniformly loaded rafts of various length/width ratios and stiffnesses, interacting with multi-layered soils of different properties. It was found that the greater the flexibility of the raft the closer was the agreement between the deformations computed from FE and FD methods and the settlements predicted from FE and RP methods. Additionally, the FE method yielded the most realistic predictions principally because of its capability to model and account for the interactions between soil layers as well as the continuity of the soil support. The results revealed that soil stresses computed from elastic methods were inaccurate in cases where a relatively incompressible bedrock existed within depths equivalent to 4 times the raft width or less. This led to a recommendation that in order to predict raft deformations accurately, only those methods that account for both soil-structure and soil–soil interaction should be used in designing raft foundation in practice.
Starting Page	1129
Ending Page	1140
Page Count	12
File Format	PDF
ISSN	09603182
Journal	Geotechnical and Geological Engineering
Volume Number	33
Issue Number	4
e-ISSN	15731529
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-02-28
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Raft foundations Finite elements and finite differences Elastic solutions Geotechnical Engineering & Applied Earth Sciences Hydrogeology Terrestrial Pollution Waste Management/Waste Technology Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Soil Science Geology Architecture Geotechnical Engineering and Engineering Geology

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