Implementação de ensaios de arrancamento cíclico de geossintéticos
Cyclic pull out tests have been used to evaluate the behavior of reinforced soil systems when subjected to cyclic loading. These tests are applied in areas such as geosynthetic reinforced pavements or geosynthetics reinforced soil systems when subjected to seismic loadings. Cyclic behavior of reinforced systems is not yet well understood. In this sense, cyclic test apparatus are desirable to study this behavior. Pull out test apparatus of the School of Engineering of São Carlos of the
... os of the University of São Paulo was modified to perform cyclic pull out tests of geosynthetics. Two types of tests were conducted to evaluate cyclic behavior of geogrid reinforced systems: soil-geogrid interface resilient shear modulus test, G i , and postcycling resistance test. Twenty tests were carried out such as monotonic, cyclic and calibration tests of geogrids. Two systems were evaluated: the first called long inclusion, with 510 mm length and 310 mm width, and the second system called short inclusion, with 240 mm length and 310 mm width. Concerning the long inclusion system, G i tests showed that it was possible to adjust the values obtained through various calibration models; the short inclusion system presented deficiency to measure displacements due to LVDT's accuracy. Post-cycling resistance tests were performed on a system similar to the short inclusion test. Post-cycling resistance tests showed good performance when compared to the literature values regarding to resistance and cyclic displacements. These tests showed that the reinforced system evaluated could suffer rupture when subjected to high amplitude cyclic loading, even when this system is stable for the same monotonic load levels. Besides that, the system behaved stably under a low amplitude cyclic loading in terms of cyclic displacements evolution, even under cyclic condition. Uncertainty in measures, transmitted vibrations, lack of inclusion length representativeness, electric noises, and equipment limitations need improvements in test procedures to evaluate G i as well to enhance the evaluation quality of the post-cycling resistance.