Large scale tests on geosynthetic reinforced unpaved roads subjected to surface maintenance

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Manuela
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Large scale tests on geosynthetic reinforced unpaved roads subjected to surface maintenance

Mensagem por Manuela » 05 Set 2016, 13:41

Autores: Ennio M. Palmeira*, Luiz G.S. Antunes.

Geotextiles and Geomembranes 28 (2010) 547e558.

a b s t r a c t:
Geosynthetic can be effectively used as reinforcement in paved and unpaved roads. This paper presents
a study on the use of geosynthetic to reinforce unpaved roads on poor subgrade. A large equipment was
used to perform the tests under cyclic loading and a nonwoven geotextile and a geogrid were used as
reinforcing layers installed at the fill-subgrade interface. Displacements along the fill surface and stresses
and strains in the subgrade were measured during the tests. Three cyclic loading stages were applied in
each test up to a rut depth at the fill surface of 25 mm be reached in each stage. At the end of a loading
stage the fill surface was repaired for the following loading stage. Monotonic loading tests were also
carried out for comparisons. The results obtained show the significant contribution of the presence of the
reinforcement layer in increasing the number of load cycles for a given rut depth to be reached and in
reducing the stresses and strains in the subgrade, particularly when geogrid reinforcement was used. It
was also observed that monotonic loading tests underestimated the contribution from the reinforcement.
A simple cost-effectiveness analysis showed that the reduction of maintenance works due to the
use of geosynthetic reinforcement may yield to significant savings in this type of problem, seldom
considered in the analysis of the economics of this type of application on a routine basis.

Keywords:
Geosynthetics
Unpaved roads
Reinforcement
Surface maintenance.
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