Physical Modelling of Earthquake-induced Liquefaction on Uniform Soil Deposit and Settlement of Earth Structures

The Palukoro fault, an active sinistral fault that cuts through Sulawesi Island, was the cause of the earthquake and liquefaction disaster in Palu and Sigi Regency in 2018. A series of studies related to liquefaction have been carried out since then but more focused on the west side of the Palu River. This research will raise the potential for liquefaction on the eastern side of the Palu river, precisely in the sabo dam area at Poi and Bangga River. These rivers are located on the opposite side of the Sibalaya liquefaction area. Liquefaction potential was calculated using the Simplified Procedure Method based on NSPT values. Fifteen and twelve boreholes are located at Bangga and Poi rivers, respectively. The qualitative analysis assessed the criteria of vulnerability based on geological factors, groundwater levels, and seismicity. The Liquefaction Potential Index method was used and calculated using several earthquake scenarios based on historical data and potential earthquakes of The Palu-koro fault. Based on LPI analysis, the Poi River has meager potential at the middle stream area and moderate level potential at the downstream. Bangga River has moderate to high liquefaction potential downstream and low to very low potential at the middle stream.

Section: Qualitative Analysis 311 Geological Review Of Poi and Bangga Riversmentioning

confidence: 99%

Study of Liquefaction Potential at Sabo dam Construction on Poi and Bangga River, Sigi Regency, Central Sulawesi

Fauzan

Rifa’i

Ismanti

2021

“…Although some of them have a well-graded classification, the downstream part of this area is dominated by sandy soil with a uniform-graded category. Areas with cohesive soil conditions and uniformly graded soil types are the areas that have high liquefaction potential, so specific methods are needed for handling them [23].…”

Section: Discussionmentioning

confidence: 99%

Potential Study of Liquefaction in the Downstream Area of Jono Oge-Paneki River, Central Sulawesi

Widyatmoko

Legono

Hardiyatmo

2021

Liquefaction during an earthquake is likely to occur in the quaternary geological layer of sediment. Based on the geological process, the mainland of Central Sulawesi was initially a sea lifted upward to become land Palu-Koro fault. Therefore, the land is basically of basic alluvium soil formation, sand deposits, and loose rock. The earthquake in Central Sulawesi in September 2018 was the cause of liquefaction, one of which was in the Jono Oge area, where most of the flow entered the Paneki river. This paper analyzed the potential for recurrent liquefaction by considering the soil structure and water level conditions. The authors focused on the downstream areas of the Paneki River, which passes through Langaleso and Kabobona Village. The data used is N-SPT data, followed by examining post-liquefaction settlement and lateral displacement. This study uses several variations of the earthquake magnitude and potential earthquakes that may occur. The results of observations indicate that the soil conditions of the study area are cohesionless soil. The liquefaction analysis shows that most of the research areas have liquefaction, land subsidence, and lateral displacement potential.

“…Disasters that often occur in the construction of this toll road are earthquakes. Earthquakes are one the catastrophic phenomena that cause destruction and damage to the surrounding area and can trigger liquefaction [2].…”

Section: Introductionmentioning

confidence: 99%

Liquefaction Potential Index Analysis in Solo – Yogyakarta - NYIA Kulon Progo Toll Road (Section Karanganyar to Klaten Regency) at Central Java

Askaviolita,

Ismanti,

Fathani

2023

Liquefaction had occurred in Yogyakarta due to an earthquake of moment magnitude, Mw 6.3 on May 27, 2006. This earthquake caused severe damage in several areas in Central Java. The study area in this construction was located mostly in some areas of Central Java Province that had a shallow groundwater table and often occurred earthquakes that might trigger liquefaction. The objective of this study was to analyze liquefaction potential in the construction of Solo – Yogyakarta – NYIA Kulon Progo toll road especially sta. 00+000-07+500 From Colomadu, Karanganyar Regency to Delanggu, Klaten Regency using two scenarios based on the existing earthquake history according to USGS data. That were earthquakes with Mw 6.3 and Mw 5.2 on a total of 47 boreholes. This study used data from Standard Penetration Tests (SPT) and laboratory tests. The liquefaction potential analysis used the simplified procedure and Liquefaction Potential Index method. Based on liquefaction potential analysis, an earthquake of Mw 5.2 has a very low liquefaction potential compared to an earthquake of Mw 6.3. According to analysis results and hazards caused, an earthquake with Mw 6.3 is recommended to be used as a basis for mitigation against liquefaction planning.