Vibration Impact on Potentially Liquefactions Slope Deformation

Abstract

In an area that has potential for earthquake has possibility of losing soil stability and causing physical soil damage, one of them is liquefaction. This research was conducted to determine the magnitude of deformation on slopes with potentially liquefaction. The soil slope samples were tested using shaking table with slope 6°, 12°, 18°, 24° and the frequency was set 6.6 Hz, 7.4 Hz, 8 Hz, 9.5 Hz. Research began with examination of soil physical properties which had unit weight of density 1.81 gr/cm3, moisture content 2.31%, specific gravity 2.72, sand with coefficient of uniform is 2.1, coefficient curvature is 0.98 and angle of repose is 23.962°. By giving earthquake acceleration of 0.4g, 0.5g, 0.6g and 0.7g in the soil slope sample that was tested by shaking table, it was liquefaction occurred. Results of research, the greater slope and frequency given, so the lateral and axial deformation will increase. Minimum lateral deformation occurs at frequency 6.6 Hz with a slope 6° and maximum lateral deformation is 17 cm at frequency 9.5 Hz with a slope 24°, while minimum axial deformation is 0.5 cm at frequency 8 Hz with a slope 6° and a maximum axial deformation is 5 cm at frequency 9.5 Hz with a slope 24°, but 12-degree slope can considered as a safe slope for slope which holding vibration

Experimental analysis of liquefaction potential with variations of soil relative density and earthquake frequency

“…It added mark speed in something range time called acceleration. This study used acceleration earthquake, however conversion acceleration to frequency for input to in tool, with formula as follows according to [23]. 5 can monitor the movement of the ground, which in this case, measures the subsidence in the ground during the shaking test.…”

“…This is the same as the research conducted by [2], this study found that as the relative density of the soil increases, the decrease will be smaller. Research by [23] concluded that the greater the frequency given, the greater the deformation that occurs. Comparison of the decrease that occurs with the increase in relative density values of 40% and 70% at a frequency of 1 Hz is 10%, and at a frequency of 1.2 Hz is 29%.…”