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All Journal Rekayasa Sipil Journal of Geoscience, Engineering, Environment, and Technology Bearing : Jurnal Penelitian dan Kajian Teknik Sipil
Alfaries, M. Rifki
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Physics Transportation

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Simulation of the Potential Liquification of Puger Sand Soil on a Small Scale in the Laboratory Alihudien, Arief; Alfaries, M. Rifki; Rizal, Nanang Saiful
Rekayasa Sipil Vol. 19 No. 2 (2025): Rekayasa Sipil Vol. 19 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.02.10

Abstract

Puger is a nearshore area in the Jember district. On the Indonesian liquefaction zone atlas map, Puger is a high liquefaction zone.  Liquefaction can occur when water-saturated soil loses its strength and behaves like a liquid due to seismic vibrations. Thus, an in-depth understanding of soil behavior and the structures above it due to liquefaction events is needed to mitigate disasters.  This study aims to effectively simulate the liquefaction potential of Puger sand material on a small laboratory scale to identify soil behavior that can cause structural damage due to liquefaction phenomena. The method used in this experiment is that water-saturated sand samples are placed in a container and subjected to vibration using a shaker to simulate the effects of an earthquake. Parameters observed include changes in density, soil deformation, and pore pressure during and after vibration. The simulation results show that the pore pressure increases sharply at a certain depth, reducing the cohesion between sand grains and causing a decrease in soil strength. This can be seen from the increase in pore pressure, which automatically decreases the effective soil stress in the soil.
Studi Penggunaan Dynamic Cone Penetrometer untuk Mendukung Perencanaan Perkerasan Jalan di Lingkungan UM Jember Budi, Galih Alnabawi Putra Amelinda Setia; Gunasti, Amri; Alfaries, M. Rifki
Bearing : Jurnal Penelitian dan Kajian Teknik Sipil Vol 10, No 2 (2025): Bearing : Jurnal Penelitian dan Kajian Teknik Sipil
Publisher : Universitas Muhammadiyah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jbearing.v10i2.10495

Abstract

This study aims to analyze the bearing capacity of the subgrade in the vicinity of Muhammadiyah University of Jember using the Dynamic Cone Penetrometer Test (DCPT) method as a basis for planning road pavement thickness. The testing was conducted at several locations by recording the cone penetration values due to falling loads (mm/impact) and converting them into California Bearing Ratio (CBR) values through an empirical approach. The test results showed that the average DCP value at point 1 was 76.58 mm/impact with a CBR of 2.19%, while at point 2 it was 79.67 mm/impact with a CBR of 2.08%. Both values indicate that the subgrade is classified as soft to very soft soil with low bearing capacity. Linear regression analysis between the DCP and CBR values produced a correlation coefficient (R) of 0.974 and a coefficient of determination (R²) of 0.948, indicating a very strong and significant relationship between the two parameters. Based on these results, it can be concluded that the DCPT method is effective for quickly and economically determining field CBR values and can serve as a reference in planning pavement thickness at the University of Muhammadiyah Jember.
Analysis of the Effects of Earthquakes on the Pile-Box Culvert System at the Gentos Bridge, Situbondo, Indonesia Alihudien, Arief; Satritama, Muhammad Ilham; Haq, Naufal Hadardien; Alfaries, M. Rifki
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.29784

Abstract

Soft soil conditions present significant challenges to the seismic performance of transportation infrastructure, particularly box culverts constructed in earthquake-prone regions. This study evaluates the effectiveness of galam timber piles in improving the stability and reducing the settlement of a pile-supported box culvert at the Gentos Bridge, Situbondo, Indonesia. Three-dimensional numerical analyses were performed using PLAXIS 3D, in which the soil behavior was represented by the Mohr–Coulomb constitutive model. Dynamic loading was applied using the RSN2736 Chi-Chi (CHY101-E) earthquake record from the NGA-West database, which was spectrally matched to the target response spectrum specified in SNI 1726:2019. The matched earthquake motion had a maximum acceleration of 0.20568 g, while the target design spectrum corresponded to a Peak Ground Acceleration (PGA) of 0.307 g. The numerical model incorporated layered soil conditions, staged construction, and soil–structure interaction to evaluate the seismic response of the box culvert foundation system. The results indicate that the installation of galam timber piles reduced elastic settlement from 5.5 cm to approximately 3.0 cm, representing a 45.5% reduction, while increasing the safety factor from 2.55 to 3.02, corresponding to an improvement of 18.4%. These improvements demonstrate a significant enhancement in foundation stiffness, load distribution, and overall structural stability under seismic loading. The main scientific contribution of this study lies in demonstrating the feasibility of utilizing locally available galam timber piles as an effective foundation reinforcement system for pile-supported box culverts subjected to earthquake loading. The proposed approach provides a practical and sustainable alternative for improving the seismic performance of transportation infrastructure constructed on soft soils in earthquake-prone regions.
Co-Authors Amri Gunasti Arief Alihudien, Arief Budi, Galih Alnabawi Putra Amelinda Setia Haq, Naufal Hadardien Nanang Saiful Rizal Satritama, Muhammad Ilham