Sub-grade support: a review of short-term and long-term performance requirements

Nataatmadja, Andreas (2014) Sub-grade support: a review of short-term and long-term performance requirements. In: 4th International Conference on Geotechnique, Construction Materials and Environment (GEOMATE 2014), 19-21 Nov 2014, Brisbane, Australia.

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Subgrade performance is a function of a soil's strength and its behaviour under traffic loading. The subgrade should be stable to prevent excessive rutting and shoving during construction, provide good support for placement and compaction of pavement layers, keep pavement rebound deflections to acceptable limits, restrict the development of excessive rutting during the service life of the pavement and minimise effect of changes in moisture level.
In the case of weak subgrades, a capping layer of some thickness may be placed on top of the subgrade to facilitate field construction. This paper demonstrates that a semi-infinite effective subgrade stiffness can in fact be calculated for a combination of a capping layer and a semi-infinite subgrade. Furthermore, this paper discusses the importance of thickness and quality of capping layer, for both short- and long-term loading conditions. The recommended capping thicknesses have been benchmarked against the UK and US requirements.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright 2014 by The GEOMATE International Society. In principle, no part of this publication may be reproduced without prior permission in writing from the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 08 Apr 2015 06:25
Last Modified: 07 Jan 2019 05:32
Uncontrolled Keywords: pavement; subgrade; capping layer; modulus; elastic analysis
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering
09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering
05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
Socio-Economic Objective: B Economic Development > 88 Transport > 8801 Ground Transport > 880106 Road Infrastructure and Networks

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