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Galuh Chrismaningwang
Department of Civil Engineering-Faculty of Engineering-Sebelas Maret University, Surakarta, Indonesia
Civil Engineering, Building, Construction & Architecture

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Application of Lai and Juang Methods for Liquefaction Probability Analysis in Petobo, Palu Nia Dwi Ariyanti; Galuh Chrismaningwang; Yusep Muslih Purwanai; Raden Harya Dananjaya
Media Teknik Sipil Vol. 22 No. 2 (2024): Agustus 2024
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jmts.v22i2.35768

Abstract

Liquefaction is a phenomenon where the soil loses its strength and rigidity, rendering it unable to support structures, often triggered by seismic activity. In Petobo, Palu City, a 7,4 magnitude earthquake caused significant subsidence and casualties, underscoring the area's susceptibility to liquefaction. This study investigates the liquefaction potential in Petobo using N-SPT data and evaluates the probability of liquefaction based on Factor of Safety (FS) values. The analysis employs probabilistic methods by Lai et al. (2006) and Juang et al. (2008), using an empirical approach based on FS. Results from six test points (LP-1 to LP-6) reveal that liquefaction potential exists at LP-2, LP-4, and LP-5, with varying risks influenced by the earthquake's magnitude. LP-5 demonstrates a high liquefaction potential, with a Liquefaction Potential Index (LPI) between 4 and 15 across different seismic magnitudes. Additionally, LP-5 shows a high probability of liquefaction, with the Lai method indicating "Almost Certainly Liquefied" at 0,99, while the Juang method suggests "Not Likely to Liquefy" at 0,32. The findings highlight that higher earthquake magnitudes significantly increase LPI values and liquefaction probabilities, emphasizing the importance of seismic considerations in the region.
Co-Authors Nia Dwi Ariyanti Raden Harya Dananjaya Yusep Muslih Purwanai