EVALUASI PERUBAHAN KEPADATAN RELATIF TANAH PASIR YANG DIPERKUAT TIANG HYBRID BERBASIS PENGUJIAN SHAKING TABLE

Abstract

Earthquakes have the potential to trigger changes in the physical properties of soil, one of which is the relative density value. This parameter is crucial for determining the shear strength of soil, its resistance to liquefaction phenomena and the stability of soil masses when subjected to dynamic loading. This study aims to evaluate changes in the relative density of saturated sand soil reinforced with hybrid piles as a result of cyclic acceleration loading via shaking table testing. A physical model was constructed in a test bed comprising a 600 mm-thick layer of sandy soil, divided into six 100 mm-thick layers with an initial relative density of 40%. Testing involved inputting sinusoidal waves with accelerations of 0.3 g, 0.4 g and 0.5 g at a constant frequency for 60 seconds. The variation in void ratio at each layer depth was analysed to represent the change in relative density due to the loading cycle. The test results showed that using hybrid piles increased the relative density values in saturated sand soils, effectively reducing the degradation of soil strength caused by cyclic acceleration loading. This finding could serve as a reference for developing soil reinforcement methods to mitigate liquefaction in earthquake-prone areas.