MECHANISTIC-EMPIRICAL MODELLING OF THE PERMANENT DEFORMATION OF UNBOUND PAVEMENT LAYERS

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MECHANISTIC-EMPIRICAL MODELLING OF THE PERMANENT DEFORMATION OF UNBOUND PAVEMENT LAYERS

Mensagem por Manuela » 05 Set 2016, 14:32

Autor: H L Theyse.

Abstract. This paper describes recent research the aim
of which was to develop permanent deformation design
transfer functions for unbound pavement layers from
Heavy Vehicle Simulator (HVS) test data. Two types of
data generated during an HVS test are used to develop
the permanent deformation models on which the design
transfer functions are based. These are the in-depth
deflection and permanent deformation data obtained
from the Multi-Depth Deflectometer (MDD)
measurements taken at regular intervals during an HVS
test. Test data from a number of HVS tests, selected
from the moderate and wet regions in South Africa, were
used for the development of the permanent deformation
models.
A multi-dimensional, conceptual model for
permanent deformation was developed and calibrated
with HVS test data for pavement foundation and
structural layers of different material qualities. These
models provide permanent deformation design transfer
functions at different expected performance reliabilities
for unbound pavement layers in South Africa.
The use of these design transfer functions is
illustrated by a number of examples. The design
approach allows each of the pavement structural layers
and the pavement foundation to contribute to the total
deformation or surface rut of the pavement structure.
Keywords. Heavy Vehicle Simulator test data, Granular
material, Permanent deformation, Design transfer
functions.
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