Comparison Between Liquefaction Potential Index And Liquefaction Risk Index In Solo – Yogyakarta – YIA Kulon Progo Toll Road (STA. 07+500 – STA. 16+700)

Abstract

The construction of Solo – Yogyakarta – YIA Kulon Progo Toll Road aims to facilitate community economic connectivity from various sectors and increase the accessibility of tourism around southern Java. This research area has geological conditions consisting of tuff (volcanic ash sand) and shallow groundwater, which can trigger liquefaction. Historical earthquake data from The IRIS Earthquake Browser showed that an earthquake with Mw 5.2 occurred in Klaten Regency. This study investigated the index of potential liquefaction and the risk of ground failure potential due to liquefaction. The potential liquefaction analysis uses 10 SPT points at STA. 07+500 – STA. 16+700. The calculation safety factor of liquefaction analysis uses the method of Idriss-Boulanger. The index of liquefaction potential uses the LPI method, and the risk of ground failure potential due to liquefaction uses the LRI method. The result of this study shows the index of potential liquefaction and risk of ground failure potential due to liquefaction from low to very high. The correlation between the index of liquefaction potential and the risk of ground failure due to liquefaction is linear. Based on this study, further research is needed regarding liquefaction mitigation to be carried out in this study area.