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All Journal Jurnal Teknik Sipil Indonesian Geotechnical Journal
Yuamar Imarrazan Basarah
Program Studi Teknik Sipil, Fakultas Teknik Sipil Dan Lingkungan Institut Teknologi Bandung
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences

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Evaluation of Empirical Formulas to Estimate Axial Capacity of Bored Pile in West Java, Indonesia Laura Naomi Roniar; Cevin Hartanto; Masyhur Irsyam; Yuamar Imarrazan Basarah; Tony Budianto Sihite
Indonesian Geotechnical Journal Vol. 2 No. 3 (2023): Vol. 2, No. 3, December 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i3.62

Abstract

Pile foundation is part of the substructure that plays an important role in carrying and supporting the load acting on it. Therefore, a proper foundation design by estimating the bearing capacity of pile foundation is needed to ensure the safety of the building foundation. To achieve better estimation of pile capacity, analysis of the axial bearing capacity should be verified by pile test results such as Static Loading Test or dynamic test with a Pile Driving Analyzer. Based on the pile test data, the values of the skin friction and end bearing resistance can be back calculated, and hence it can be used in the calculation of pile bearing capacity using empirical methods. In this study, bearing capacity analysis was performed for drilled pile foundations, which had been tested using Static Loading Test and Pile Driving Analyzer. The analysis was carried out by comparing the results of empirical calculations for each test pile with the results of field tests. The calculation results were then compared to the empirical adhesion factor (alpha) method, which is commonly used by practicing engineers in Indonesia, according to the methods proposed by Kulhawy (1984), Reese & Wright (1977), and Reese & O'Neil (1988). Based on the 104 test piles data, the results are more in good agreement with the adhesion factor proposed by Kulhawy (1984) with a correlation of undrained shear strength, cu of 8 NSPT, a correlation of unit skin friction for sandy soils of 2.2 NSPT, and a correlation of unit end bearing for sandy soils of 70 NSPT-ave.
Studi Awal Amplifikasi Gerak Tanah Gempa untuk Universitas Indonesia (Depok) Lucky Suryajaya, Lingga Ekaputra; Prakoso, Widjojo Adi; Basarah, Yuamar Imarrazan; Pramono, Sigit
Jurnal Teknik Sipil Vol 31 No 2 (2024): Jurnal Teknik Sipil - Edisi Agustus
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.2.4

Abstract

Abstract This research is motivated by the frequent occurrence of earthquakes in Indonesia in recent years. Meanwhile, the common practice in determining soil and seismic parameters in Indonesia still heavily relies on various empirical studies. Therefore, this study aims to investigate soil and seismic parameters in Indonesia through the phenomenon of earthquake ground motion amplification, with a case study located at the University of Indonesia (Depok). The research methods employed include the analysis of earthquake recording data in the UI Forest at a depth of 300 meters, one-dimensional modeling using DEEPSOIL v7 software, and a comparative analysis of the ground motion recording results of the earthquake in Banten on January 14th, 2022, with a magnitude of 6.6 (low strain) on the surface of UI Forest and FMIPA UI. The research results show visible oscillations at the end of the ground acceleration output and a spike in the peak ground acceleration (PGA) value at around 30 meters in the uppermost layer, with periods and spectral acceleration higher than the expected recorded values. This indicates that the soil modeled based on correlation is softer than anticipated. In other words, the soil is stiffer than previously assumed based on the established correlations.
Co-Authors Cevin Hartanto Laura Naomi Roniar Lucky Suryajaya, Lingga Ekaputra Masyhur Irsyam Prakoso, Widjojo Adi Sigit Pramono Tony Budianto Sihite