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All Journal Teknisia Civil and Environmental Science Journal (CIVENSE) Civil Engineering and Technology Journal
Marasabessy, Muhammad Irfan
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Environmental Science Transportation

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PENGARUH DAYA DUKUNG TANAH DALAM PENENTUAN PONDASI BORED PILE DAN PILE CAP PADA GEDUNG BERTINGKAT Nurokhman, Nurokhman; Iskandar, Muhammad Ryan; Hanafi, Nufrizal Farid; Marasabessy, Muhammad Irfan
CivETech Vol. 5 No. 1 (2023): CivETech
Publisher : Fakultas Teknik Universitas Cokroaminoto Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47200/civetech.v5i1.1553

Abstract

In building design, the problem of soil investigation is to determine the property value and property engineering which determines the selection of the foundation type and its depth. Generally, soil investigations are carried out by means of sondir and drilling which are then calculated with a certain formula to determine the bearing capacity of the soil. The purpose of this study is to identify soil properties at the project site, evaluate the results of soil investigations, and bored pile foundation design. The research method is to collect data from reference sources that are directly related to designing, especially PT. Poladata Consultant Consultants, and direct surveys to the location through systematic stages. Results soil investigation, the Cone Penetration Test (CPT) soil test at the site location of the UGM Faculty of Law Building was carried out at 2 points (S-1 and S-2) which shows the groundwater level at an elevation of -4.00 m, and soil drilling or Standard Penetration Test (SPT) at a depth of -13.40 m, the value of qc conus resistance reaches> 600 kg / cm2. The carrying capacity of the bored pile from the SPT data uses the Reese & Wright method for the case study F1 foundation is installed with 4 bored piles diameter (d) = 0.8 m2, depth (L) = 23-28 m, carrying capacity (qp) = 272.328 T/m2, Safety Factor (SF) = 3, with a piece size of 3.6 m x 3.6 m thick 1.2 m with reinforcement D16-120 mm.
Numerical Analysis of Stability in Basement Excavations: The Influence of Undrained and Drained Conditions on Soft Soils in Surabaya Marasabessy, Muhammad Irfan
Civil and Environmental Science Journal (CIVENSE) Vol. 8 No. 1 (2025)
Publisher : Fakultas Teknik Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2024.008.01.5

Abstract

Excavation in soft soil significantly affects stress-strain behaviour and pore water pressure, influencing overall stability. However, previous studies have primarily focused on excavation stability in moderate soil conditions, with limited analysis of highly saturated soft clay environments. This study addresses the gap by analyzing the stability of basement excavation walls in Surabaya’s highly saturated soft clay (NSPT = 1) under undrained (short-term) and drained (long-term) conditions. The objective is to evaluate the impact of pore water pressure dissipation on excavation stability and compare safety factors over time. A numerical analysis was conducted using the Finite Element Method (FEM) in PLAXIS 2D with the Hardening Soil (HS) model. The excavation, staged in 2-meter increments to a depth of 10 meters, is supported by a 25-meter-deep secant pile wall with horizontal struts. The analysis shows that the Safety Factor (SF) remains within acceptable limits throughout all excavation stages. However, under drained conditions, the SF decreases over time due to pore water pressure dissipation, highlighting the importance of long-term stability assessments. Practical recommendations include optimizing strut placement, increasing secant pile depth, and applying soil improvement techniques to maintain excavation safety. The study emphasizes the necessity of Effective Stress Analysis (ESA) in capturing long-term behaviour, ensuring reliable and safe geotechnical design in soft soil environments.
Evaluation of seismic site amplification factors in Yogyakarta using One-Dimensional site response analysis Marasabessy, Muhammad Irfan; Saputra, Elvis; Basarah, Yuamar I
Teknisia Vol 30 No 1 (2025): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol30.iss1.art1

Abstract

This study evaluates seismic site amplification in Yogyakarta using one-dimensional (1D) nonlinear site response analysis. Subsurface conditions were characterized using borehole and Standard Penetration Test (SPT) data from four different locations. Ground motion records were selected and matched to the seismic hazard target spectrum at the bedrock level in Yogyakarta. The nonlinear site response analysis was then used to propagate the seismic waves to the ground surface using the DEEPSOIL program. The results show de-amplification at short periods (T < 0.5 s) and amplification at longer periods (T > 1 s), The highest amplification is observed at T = 0.15 s, with an average factor of 3.47. A comparison with the Indonesian seismic design code SNI 1726:2019, which shows that the code provides more conservative estimates than the site-specific analysis in this study. The analysis also shows that lower input motion intensity at bedrock (PGA = 0.02g) leads to higher amplification, while higher PGA (up to 0.72g) results in reduced response. This study highlights the need for site-specific analysis and consideration of input motion variability.
Co-Authors Basarah, Yuamar I Hanafi, Nufrizal Farid Muhammad Ryan Iskandar Nurokhman, Nurokhman Saputra, Elvis