The Stability Analysis of the Bored Pile Foundation as Liquefaction Hazard Mitigation at the University of Tadulako Reconstruction Project

Abstract

A Pile foundation is one of the most important structural elements. Pile foundations are used to support buildings when the hard soil layer is located very deep to keep the structure stable and standing when loaded by internal and external forces. The University of Tadulako is located in a moderate liquefaction-prone zone. In planning for rebuilding post-earthquake, where this area suffered massive damage, it was built on loose sandy soil with shallow groundwater levels. As a result, it has a possibility of liquefaction hazards in this area. This study aims to analyze the stability of the bored pile foundation as liquefaction hazard mitigation under service and extreme conditions. The analysis is carried out using two approaches, analytical method and computer-aided numerical simulation using RSPile and GEO5 2019. The type of foundation plan that will be used is the bored pile foundation with a diameter of 0.6 meters with a depth of 10 to 13 meters. The result shows the foundation remains stable under service conditions, but under extreme conditions, the foundation collapsed for type P1.B, and recommended redesign becomes type P1.A. However, after redesigning, the foundation becomes inefficient, and further research is needed on efficient foundation design.