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OOO ХЮСКЕР
Ленинградское шоссе 69-1
125445 Москва
Россия

Deformation Analysis of a Geogrid-Reinforced Pavement

Abstract

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.

Conclusion

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.