Effects of Soil Liquefaction to Foundation Bearing Capacity Based on Empirical and Numerical Simulation

Abstract

Soil liquefaction is one of the collateral hazards of earthquakes which can cause a soil layer to lose its bearing capacity, which can affect the stability of structures. Failure of a building structure can cost many lives, especially in strategic buildings. This research discusses bored pile foundations from the planned construction of elevated road in the Purwomartani area which located in moderate liquefaction vulnerability zone. The objective of this study is to estimate the influence of soil liquefaction on pile foundation capacity in elevated road construction plan in Purwomartani. This research uses empirical approach of Reese and O’Neil 1989 to calculate the axial bearing capacity of the pile under static and liquefaction conditions, and numerical simulation with the help of RSPile software to model the soil-pile interaction and the pile displacement under lateral loading. The data used in this research includes liquefaction potential data, foundation profile, soil investigation, standard penetration test, and laboratory tests. The analysis results showed that liquefaction caused a reduction in the foundation bearing capacity where axial bearing capacity reduce about 39,92 – 21,28% and lateral bearing capacity reduce by 5,31%.