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Deformation Analysis of a Geogrid-Reinforced Pavement

Resumo

In the last decades, geosynthetics for pavement

base and subgrade reinforcement have been used with increasing tendency

worldwide, enabling the reduction of layers thickness and time of construction.

The advantageous effect of the inclusion of geosynthetic reinforcement can be

quantified by incorporating the geogrid properties into conventional design

methods for different subgrade conditions. However, the most of the available

approaches are concerned about laboratory studies since just a few numbers of

field experiences that take into account the real conditions of the structure

during its service life can be found in literature. This article presents a measurement and

monitoring program which was carried out in a polypropylene geogridreinforced

pavement section during the construction period and after the operational traffic

opening. Besides, it shows the results of a deflection analysis obtained by

using Benkelman beam tests, confirming the efficiency of the reinforcement in

the reduction of layers thicknesses and in the improvement of the general

structural behavior of the pavement.

Conclusão

Based on the study pavement was found that the

use of polypropylene geogrid as reinforcement of base pavement is an excellent

solution for locations where the subgrade has low bearing capacity and also in

places where the pavement structure has to be thin due to urban interference,

thanks to the high modulus of rigidity of geogrid that allows a considerable

reduction in the deflections of the reinforcement pavement. The method used for the design of the structure

proved to be very efficient, indicating a thin structure and excellent

structural coefficient. Despite the deflections in some stakes were

above what is allowable, the solution perfectly fits the expectations of the

project because of the urban interference, as can be seen in Figure 7, it was

not possible to run higher than the base layer performed with geogrid. In addition (Table 4), the polypropylene

geogrid promoted an increase of 2.25 times the stiffness of the module of

graded gravel.