Liquefaction Due to September 30th 2009 Earthquake in Padang

Hakam, Abdul; Suhelmidawati, Etri

doi:10.1016/j.proeng.2013.03.013

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…The data was obtained in the form of data for 1 point Cone Penetration Test (CPT), relative density (Dr), and average grain size (D50) in Air Tawar, Padang. The area has the potential for liquefaction with indicating evidence of sand boils during the Padang earthquake on September 30, 2009 [12]. The stages of the research to be carried out are:…”

Section: Methodsmentioning

confidence: 99%

Liquefaction Mitigation Analysis Using Vertical Drain

Novasari

Hakam

Andriani

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Liquefaction in semi-permeable soils such as fine sands occurs when the required time to transfer the pore water pressure into the form of effective stress is longer than the increased time of pore water pressure. Therefore, liquefaction mitigation needs to be done to speed up the air pressure flow time during an earthquake such as using vertical drains in this study. The data used here are adopted from previous studies that have been taken from a field test in Air Tawar, Padang. The results showed there is liquefaction potential based on soil data processing. The equivalent circle diameter value for the vertical drain is 1.2 m or a radial equivalent value of 0.6 m. Based on the analysis, the 60% pore water pressure dissipation within 20 seconds was obtained at a distance of 0.291 m in the radial direction. From the data above, it can be obtained that the vertical drain is capable of dissipating 60% of water pressure within 20 seconds to avoid liquefaction within the soil mass. Then it can be concluded that the application of vertical drain at a certain distance and depth can mitigate liquefaction in soil layers.

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Section: Methodsmentioning

confidence: 99%

Liquefaction Mitigation Analysis Using Vertical Drain

Novasari

Hakam

Andriani

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Berdasarkan hasil penelitian mengenai jenis tanah likuefaksi akibat gempa di Padang pada September 2009, jenis tanah berupa tanah dengan kandungan butiran pasir halus sebanyak 65 % [5].Tanah yang dapat menyebabkan likuefaksi yaitu dengan 3 kriteria yaitu:…”

Section: Tinjauan Pustakaunclassified

Permodelan 2D Tanah Likuefaksi menggunakan Quake/W

Arif

Adriyati

2021

JCEP

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Likuefaksi merupakan kejadian dimana konsistensi tanah berubah dari padat menuju cair akibat berkurangnya tegangan efektif tanah. Hal ini dapat terjadi karena adanya beban siklik ataupun gempa bumi. Kejadian likuefaksi umumnya terjadi pada tanah dengan distribusi butiran pasir halus dan muka air tanah yang dangkal. Likuefaksi dapat menimbulkan kegagalan pada konstruksi maupun tanah seperti seperti sand boils, flow failures, lateral spreads, ground oscillation, kehilangan daya dukung, bangunan turun masuk ke dalam tanah, dan lain sebagainya. Penelitian ini bertujuan untuk dapat mengetahui potensi likuefaksi tanah dengan menggunakan permodelan 2 dimensi menggunakan perangkat lunak Quake/W. Data yang digunakan dalam permodelan ini yaitu data stratigrafi tanah yang berasal dari pemboran dan data karakteristik tanah meliputi distribusi ukuran butir, persentase butiran halus, dan indeks plastisitas tanah hasil dari pengujian laboratorium. Selain data kondisi tanah, data gempa juga digunakan dalam permodelan. Data gempa yang digunakan yaitu berupa kurva time history perubahan percepatan terhadap waktu. Permodelan dilakukan dengan skenario kondisi statis dan kondisi dinamis agar memberikan gambaran bagaimana perubahan kondisi tanah sebelum dan setelah gempa. Perubahan tegangan efektif tanah ditinjau pada kedalaman 1m; 1,5m; 2m; dan 2,5m. Hasil permodelan menunjukkan bahwa terjadi penurunan tegangan efektif tanah hingga 30% pada masing-masing kedalaman.

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“…A preliminary study on liquefaction potential was conducted through empirical analysis using Standard Penetration Test (SPT) data [5,6,7]. The primary concept of empirical analysis entails comparing the Cyclic Resistance Ratio (CRR) and Cyclic Stress Ratio (CSR).…”

Section: Introductionmentioning

confidence: 99%

The Correlation of Liquefaction With Excess Pore Water Pressure in Langkat, North Sumatra

Aini

2024

GEOMATE

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An earthquake is a natural occurrence that has the potential to trigger liquefaction. In fine sandy soil layers with a shallow water table, earthquakes can cause a rapid increase in excess pore water pressure (PWP), compromising the soil's effective strength and increasing the risk of liquefaction. According to the Indonesian Liquefaction Vulnerability Zone, North Sumatra is categorized as a liquefaction area. Langkat is one of the regencies in North Sumatra that is categorized as having a moderate liquefaction vulnerability. Therefore, Langkat was chosen as a research area to investigate liquefaction potential using pore water pressure (PWP) with empirical methods by Yegian and Vitelli (1981) and numerically using Deepsoil V7.0. The study area consists mostly of sand with shallow groundwater levels due to its proximity to rivers and high seismic zones associated with the Sumatran fault. The analysis is based on Standard Penetration Test data and laboratory tests from 2 boreholes with a depth of 30 m. The lts show that full liquefaction potential exists at BH 01, a depth of 9-11 m below the ground surface with 𝑟𝑟𝑢𝑢 > 0.8 and a limit of γmax ≥ γ. Marginal liquefaction occurs at BH 02 at a depth of 3.5 m with 𝑟𝑟𝑢𝑢 > 0.8 and γmax < γlimit. Evaluation of the excess pore water pressure ratio in area prone to liquefaction is important because this condition can cause rapid damage. The low bearing capacity of the building foundation is proven by the 𝑟𝑟𝑢𝑢 value approaching 0.8.

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Liquefaction Due to September 30th 2009 Earthquake in Padang

Cited by 12 publications

References 1 publication

Liquefaction Mitigation Analysis Using Vertical Drain

Liquefaction Mitigation Analysis Using Vertical Drain

Permodelan 2D Tanah Likuefaksi menggunakan Quake/W

The Correlation of Liquefaction With Excess Pore Water Pressure in Langkat, North Sumatra

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