PENGARUH FREKUENSI GETARAN TERHADAP POTENSI LIKUIFAKSI

Lindung Zalbuin Mase(1),
(1) Jurusan Teknik Sipil, Universitas Bengkulu, 

Abstract


Liquefaction is a lost of shear strength phenomenon in saturated sandy soil due to excess pore
water pressure during earthquake shaking. Several factors influencing liquefaction are relative density of
sand, grain size, ground water level, magnitude of earthquake, and earthquke shaking duration. The
experimental study using shaking table was performed to investigate liquefaction potential. Soil sample is
sandy soil with relative density (RD) less than 33% and can be categorized as loose sand. The dyanmic
modelling in this experimental study included peak ground acceleration (PGA) of 0.4g, shaking duration
of 32 sec, and vibrational frequency of 1.4 Hz; 1.6Hz, and 1.8Hz. The parameter used to determine
liquefaction in this study is excess pore water pressure ratio (ru), which reflects that liquefaction could
happen if ru > 1 and vice versa. The result show that the applied loads were able to trigger liquefaction in
sandy layer. Besides, the liquefaction duration and ru max tend to increase when the vibrational
frequencies increase.

Keywords


liquefaction; shaking table; earthquake; sandy soil

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