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|Title: ||Simplified laboratory assessment of subgrade performance parameters for mechanistic design of pavement foundations|
|Authors: ||Frost, Matthew W.|
Edwards, Jonathan Paul
Fleming, Paul R.
Arnold, Stuart J.
|Issue Date: ||2005|
|Publisher: ||© National Academy of Sciences|
|Citation: ||FROST, M.W. ... et al, 2005. Simplified laboratory assessment of subgrade performance parameters for mechanistic design of pavement foundations. Transportation research record : journal of the Transportation Research Board, 1913, pp.77-85 [DOI:10.3141/1913-08]|
|Abstract: ||With the increasing agenda for sustainability, the UK is attempting to move away from the empirical
design of pavement foundations to develop a performance specification approach to facilitate analytical
design. For analytical design the measurement of the subgrade performance parameters of resilient
modulus and resistance to permanent deformation are required. These parameters ideally need to be
assessed concurrently under loading and environmental conditions similar to those the materials will
experience in the field. To date, measurement of these parameters is largely confined to research
laboratories using cyclic triaxial testing with advanced on sample strain measurement. This apparatus is
considered too complicated for routine commercial use, hence this potentially limits the
implementation of laboratory performance evaluation for routine pavement foundation design.
A previous program of cyclic triaxial testing on clay subgrades indicated a series of useful
correlations between strength and permanent deformation behavior (via a threshold stress), and
material resilient modulus at this threshold. This paper reviews the previous work and utilizing these
correlations presents data from tests on three different clay materials performed to develop simplified
equipment and procedures for the routine measurement of the required design parameters. It is shown
that simple pseudo-static tests can measure a subgrade modulus for a simplified performance based
design. It re-evaluates the previous data (in the light of the recent work) to show a boundary correlation
that may allow a shear strength based parameter to control (in design) the onset of permanent
deformation, and details how long-term subgrade water content changes can be accommodated.|
|Description: ||This is a journal article. It was published in the journal, Transportation research record : journal of the Transportation Research Board, [© National Academy of Sciences] and the definitive version is available at: http://trb.metapress.com/content/120399/|
|Appears in Collections:||Published Articles (Architecture, Building and Civil Engineering)|
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