ANALYSIS OF LIQUEFACTION EFFECT ON SETTLEMENT USING ROCSCIENCE SETTLE AT MALALAYANG BEACH AREA, NORTH SULAWESI

J Prayogo^[1]*, F Faris², H C Hardiyatmo³

¹Master student in Natural Disaster Management Engineering, Department of Civil and Environmental Engineering Universitas Gadjah Mada, Yogyakarta, Indonesia

²Directorate General of Human Settlements, The Ministry of Public Works and Housing, South Jakarta, Indonesia

³Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia

^[1]* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art38

Abstract.

The Malalayang Beach area is a strategic tourist destination close to Manado city. Arrangement of the area is carried out by building several buildings that can support this area as a tourist destination. Liquefaction is a phenomenon when the soil loses its strength of contact between particles. This is due to earthquake shocks that trigger an increase of water pressure in areas with loose sand characteristics (not dense). The settlement of soil due to liquefaction is a vertical deformation of the soil in the soil layer caused by soil compaction due to earthquakes. The study purpose is to determine how much reduction could occur at the research site as an early stage of the early stages of risk management. With the N-SPT data, the Yoshimine method and the computational method Rocscience Settle 3D can be used to analyze the settlement. Yoshimine method indicates settlement with a very low classification in BH-MLY-01 and high in BH-MLY-05. In RS Settle 3D, the location of BH-MLY-01 has a very low classification, and the location of BH-MLY-05 is dominated by low classification. The maximum settlement resulted from the Rocscience Settle 3D at the BH-MLY-05 location by 11,588 cm.

Keywords: Liquefaction; The settlement of soil; Risk Management

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