Design of road foundations

Thom, Nicholas (1988) Design of road foundations. PhD thesis, University of Nottingham.



Research has been conducted into the fundamental mechanical properties of a granular material. This has involved the use of both a repeated load triaxial apparatus and a new hollow cylinder apparatus, which has required development and modification. Building on the foundation of earlier research at Nottingham, models have been developed which predict the stress-strain behaviour of a dry granular material under any combination of applied stresses. This includes repeatable elastic behaviour and the development of irrecoverable plastic strain. The accuracy of these models has been tested as far as possible using available test equipment.

The effects of varying particle gradation, degree of compaction, maximum particle size and mineral type have been explored using a repeated load triaxial apparatus. The effect of moisture has also been investigated with respect to both full and partial saturation.

A computer program (GRANMAT) has been written, which makes use of the stress-strain equations developed, to analyse a road pavement structure consisting of thin bituminous surfacing, granular base and subgrade. The reliability of the program has been assessed and areas of necessary improvement indicated.

In-situ testing at a number of road sites is described and analysed with respect to both the effect of compaction on a granular road foundation and the use of a number of in-situ test devices.

Finally, the information gained, in the laboratory and on site, is brought together in a series of design suggestions for granular road foundations, with particular reference to results from the GRANMAT computer program.

Item Type:Thesis (PhD)
Supervisors:Brown, S.F.
Uncontrolled Keywords:granular, sub-base, triaxial, hollow cylinder,pavements, foundations
Faculties/Schools:UK Campuses > Faculty of Engineering > School of Civil Engineering
ID Code:281
Deposited By:Nicholas Howard Thom
Deposited On:14 Jun 2007
Last Modified:06 Feb 2009 14:43

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