Experimental Liquefaction Study of Southern Yogyakarta Using Shaking Table
Abstract: An experimental
study using shaking table was conducted to learn liquefaction. Samples used
were sandy soils from South of Yogyakarta Special Region Province. Analysis of
liquefaction potential was performed by considering several factors, i.e. peak
ground acceleration (PGA) of 0.3 g to 0.4 g, vibrational frequency of 1.8 Hz,
and vibration duration of 8, 16, and 32 seconds which reflect earthquake
magnitudes of 5, 6, and 7. The pore water pressure was measured by using a
pressure transducer. Liquefaction potential was determined by using the
parameter of excess pore water pressure ratio (ru). Liquefaction potentially
occurred when ru > 1, whereas ru < 1 indicated liquefaction didn’t occur.
The results of test showed that liquefaction potentially occur in each applied
dynamic load, that maximum excess pore wate pressure (ru max) measured was
equal to or larger than 1. The larger peak ground acceleration applied, the
faster beginning time of liquefaction. The bigger peak ground acceleration
applied, the slower dissipation time of pore water pressure. The duration of
liquefaction become longer, along with the increase of applied peak ground
acceleration. The bigger applied peak ground acceleration, the larger maximum
excess pore water pressure.
Keywords: Sandy soil,
liquefaction, vibrational frequency, excess pore water pressure ratio, shaking
table
Penulis: Lindung Zalbuin Mase
Kode Jurnal: jptsipildd170109
