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초록

This study investigates the effect of cyclic normal loading on the static pullout behavior of geogrids installed in compacted sandy soils. A series of laboratory pullout tests was performed where geogrid specimens were subjected to cyclic normal loads (CNL) with varying amplitudes. The results show that the geogrid pullout behavior under cyclic normal loading generally falls between those under the static normal stresses corresponding to the cyclic upper and lower normal stresses. For all baseline normal stress levels tested, there is a general trend of increasing peak pullout resistance with increasing CNL amplitude but with a strong dependency of the magnitude of increase on the baseline normal stress level. This observation highlights the importance of considering the cyclic amplitude in relation to baseline normal stress when estimating the pullout resistance of a geogrid under cyclic normal loading. Based on the test results, an equivalent normal stress approach incorporating cyclic amplitude mobilization factor was presented for evaluating the interaction coefficient under cyclic normal loading. The practical implications of the findings were also discussed.

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