Wear resistance of geosynthetic interfaces constituted by geomembranes and geospacers

Abstract

Esse artigo apresenta os resultados de um estudo experimental que visa a avaliar o efeito do desgaste superficial sobre as propriedades de atrito de interfaces geossintéticas constituídas por geomembranas. Os ensaios foram realizados em equipamento de plano inclinado e os resultados demonstram as diferentes sensibilidades das interfaces, testadas ao processo de desgaste. Para os tipos particulares de interfaces consideradas no programa experimental, constatou-se que o desgaste superficial pode aumentar, diminuir ou manter as propriedades originais de atrito da interface geossintética, repercutindo, diretamente, sobre a estabilidade desta sob condição de serviço. Palavras-chave:

Geosynthetic Interface Friction at Low Normal Stress: Two Approaches with Increasing Shear Loading

“…The data show a good agreement between the two Following an approach already presented in other research [22,23], after the first evaluation, carried out on virgin specimens, the tests were repeated several times, repositioning the block, after each sliding, in the initial position and proceeding in the same way for both the inclined plane and the direct shear SSI tests. Numerous values of the friction angle were thus obtained, related to the amount of the cumulated displacement experienced by the interface, which was pushed up to approximately 1.6 m, thus allowing us to investigate the wear effect [24]. Three pairs of specimens were studied, for each device, in the dry condition; moreover, the tests were repeated in the wet condition on three different pairs of specimens, for the inclined plane, and three others for the direct shear, for a total of 12 pairs of specimens and about 72 tests achieved.…”

Dry friction behaviour of a geosynthetic interface using inclined plane and shaking table tests

“…The first process is mainly related to the ageing of the polymer, while the second may be a consequence of managing (Giroud, 2012;Pitanga et al, 2013). In order to simulate the effect of mechanical damage in terms of wear, a series of repeated inclined plane tests were carried out under the same experimental conditions and using the same interface (virgin and retested), thus causing a progressive rubbing of the surfaces in contact.…”