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All Journal Sinergi Jurnal Teknik Sipil Jurnal Teknik Sipil Advance Sustainable Science, Engineering and Technology (ASSET)
Alfrendo Satyanaga
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Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Effect of near-surface heterogeneities on the pore-water pressure distribution and slope stability Gofar, Nurly; Pangestika, Ega Nanda; Harianto, Yudi; Gumay, Herdian; Satyanaga, Alfrendo
SINERGI Vol 28, No 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2024.2.012

Abstract

Seepage and slope stability are important problems analyzed in geotechnical engineering. Conventionally, the analysis is performed in conditions where the soil is intact. However, near-surface soil is subjected to various conditions that lead to heterogeneity, for example, the presence of cracks in clay, relics in weathered rock, and plant roots. The presence of cracks and other forms of heterogeneity on the near-surface layer increases the rainfall infiltration into the slope and changes the pore water pressure distribution accordingly. Water infiltration increases the pore water pressure, raises groundwater level, and decreases the matrix suction of unsaturated soils - which is a critical factor for the stability of slopes. This study aims to evaluate the effect of varying permeability of near-surface soil on the rainwater infiltration to slope and, subsequently, the safety factor. In this case, the near-surface soil is modeled as a layer with higher permeability. Numerical analysis performed in this study using SEEP/W and SLOPE/W indicated that considering this condition results in a higher safety factor of the slope because the higher permeability resulting from heterogeneity helps dissipate pore water pressure, which is critical in maintaining the slope stability during heavy rainfall.
Analisis Numerik Stabilitas Lereng Terhadap Curah Hujan Pada Tanah Tak Jenuh Ramadhan, Rabbani Isya; Hamdany, Abdul Halim; Adiguna, Glenn Adriel; Satyanaga, Alfrendo
Jurnal Teknik Sipil Vol 31 No 3 (2024): Jurnal Teknik Sipil - Edisi Desember
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2024.31.3.5

Abstract

Abstract Unpredictable climate change makes high intensity rainfall infiltration possible in the future. This can cause slope collapse due to rainfall infiltration. Indonesia has areas that are very susceptible to slope collapse due to rainfall. The purpose of this study was to determine the characteristics of the pore water pressure distribution and slope stability during rainfall on the original slope through numerical modeling. The groundwater characteristic curve was measured using high-suction polymer sensors (HSPS). Volume changes in the soil were obtained using a 3D scanner. Numerical modeling was carried out with the help of GeoStudio. Seepage analysis was carried out using SEEP/W to obtain changes in the pore water pressure distribution due to rainfall infiltration. Slope stability was carried out using SLOPE/W to determine the slope safety factor due to rainwater infiltration. The results showed that the intensity and duration of rainfall had a significant effect on slope stability. The longer the duration of rainfall and with high intensity can cause a greater decrease in the safety factor. This is because the suction power of the soil has decreased and causes the shear strength of the soil to be lower so that it can cause slope failure. Keywords: Unsaturated soil, SWCC, rainfall infiltration, slope stability
Numerical Investigation of Consolidation Settlement for Runway Construction on Soft Soil: A Case Study in Sumbawa, Indonesia Farichah, Himatul; Hutama, Dio Alif; Alextrianto, Vandi; Satyanaga, Alfrendo; Ghifari, Fikri
Advance Sustainable Science Engineering and Technology Vol. 7 No. 3 (2025): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i3.1805

Abstract

Runway construction on soft soil presents significant engineering challenges due to excessive settlement, which can affect structural stability and long-term performance of transportation infrastructure. This study investigates the settlement of a runway in Sumbawa, Indonesia using the Finite Element Method (FEM) in Plaxis 2D. The Hardening Soil Model was applied to realistically capture nonlinear soil behavior. Input parameters were derived from a series of N-SPT data and laboratory test results. The findings indicate that during the operational phase, the maximum and minimum settlement were 307.1 mm and 2.491x10-3 mm, respectively. Meanwhile, consolidation-induced settlement reached a maximum of 357.97 mm and a minimum of 10.6 mm. The distribution of total settlement along the runway varied depending on soil characteristics. Sections with predominantly clayey soil exhibited greater settlement, whereas areas with sandy soil experienced significantly lower settlement.
Pemodelan Numerik Pembebanan Pipa Menggunakan Metode Interpolasi Linier Satyanaga, Alfrendo
Jurnal Teknik Sipil Vol 1 No 2 (2005): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v1i2.10338

Abstract

The movement of pipe in sand and clay are presented, formulated and analyzed using a linear interpolation method within the framework of elastic perfectly plastic Mohr Coulomb criteria and a new two-mechanism- non-associative piecewise linear Drucker Prager formulation. The two mechanisms are found when the variation of shear strength due to mean effective stress is separated from that due to plastic deviatoric strain. The modelling framework is intended to show the deformation and displacement of soil surrounding pipe. Furthermore it also describes the relationship between displacement and the force. Horizontal and vertical displacement are applied into pipe and they are modelled using finite element program, CRISP version 4. Slip element (interface) is attached in the vicinity of pipe to compare the deformation produced in this case with those without interface. Different material properties of cohesive and granular soil taken from laboratory tests are set in the model. All main parameters are recorded from lateral and horizontal loading test, as a part of the Collaborative Project on Soil/Pipe Interaction Mechanisms and Modelling. Application of the approach are presented and discussed with emphasis on identifying and optimizing some of the important factors that control the displacement of soil because of the movement of pipe. Several conclusions are drawn regarding the difficulties encountered in the numerical implementation. Illustrative numerical results for common geotechnical experiments on clay and sand using finite element software demonstrate the stable derivation of the two linear non associative Drucker Prager model.
Co-Authors Abdul Halim Hamdany Adiguna, Glenn Adriel Alextrianto, Vandi Dio Alif Hutama Ghifari, Fikri Gumay, Herdian Harianto, Yudi Nurly Gofar, Nurly Pangestika, Ega Nanda Ramadhan, Rabbani Isya