Garuda - Garba Rujukan Digital

Analisis Stabilitas Lereng Jalan Tol Dengan Variasi Kemiringan Menggunakan Program GeoSlope Ifthar Ramadhana Wahyudi; Yerry Kahaditu Firmansyah; Bagas Aryaseta
MEDIA KONSTRUKSI Vol. 10 No. 3 (2025)
Publisher : Jurusan Teknik Sipil, Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/jmk.v10i3.187

Desain geometri lereng merupakan aspek penting dalam pembangunan infrastruktur di wilayah berkontur, karena berpengaruh langsung terhadap efisiensi lahan dan stabilitas lereng. Sudut kemiringan menjadi parameter utama dalam perencanaan lereng, di mana sudut yang lebih curam menghemat lahan namun meningkatkan risiko longsor. Penelitian ini bertujuan untuk menganalisis pengaruh variasi sudut kemiringan terhadap kestabilan lereng dengan memanfaatkan data uji Standard Penetration Test (SPT) dan perangkat lunak GeoSlope (Slope/W). Tahapan analisis dimulai dari koreksi nilai N-SPT terhadap tekanan overburden, dilanjutkan dengan korelasi parameter tanah seperti kohesi (c), sudut geser dalam (ϕ), dan berat volume (γ). Analisis dilakukan dalam kondisi statis menggunakan metode Bishop Simplified. Hasil penelitian menunjukkan bahwa lereng eksisting dengan sudut 45° memiliki nilai faktor keamanan (FoS) sebesar 2,093 yang sangat stabil. Pada variasi sudut 55° dan 65°, nilai FoS masing-masing sebesar 1,772 dan 1,549, masih dalam batas aman (FoS > 1,5). Namun, pada sudut 75°, nilai FoS turun menjadi 1,340, di bawah ambang batas kestabilan. Dengan demikian, peningkatan sudut kemiringan hingga 65° masih dapat diterima untuk mengurangi kebutuhan lahan, selama tidak terdapat gangguan eksternal yang signifikan.

Analisis Daya Dukung dan Penurunan Tiang Pancang dengan Pre Boring pada Proyek Jembatan JLS LOT 3 Blitar, Jawa Timur Muhammad Ainun Nashrul Majid; Yerry Kahaditu Firmansyah; Bagas Aryaseta
MEDIA KONSTRUKSI Vol. 10 No. 3 (2025)
Publisher : Jurusan Teknik Sipil, Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/jmk.v10i3.192

Pada pembangunan JLS Lot 3 segmen Pantai Serang – Sumbersih di STA 2+400, dibangun jembatan dengan kondisi tanah berupa batu kapur dan terdapat lapisan tanah lensa yang berpotensi membahayakan konstruksi. Awalnya digunakan fondasi tiang bor, namun karena kendala waktu dan cuaca dilakukan redesain menggunakan fondasi tiang pancang dengan metode pre-boring pada tanah keras (SPT > 50). Analisis daya dukung tiang dilakukan dengan metode Luciano Decourt, sedangkan penurunan menggunakan Plaxis. Hasil perhitungan menunjukkan daya dukung tiang tunggal aman karena nilai Qu selalu lebih besar dari Qijin, misalnya pada Abutment 1 Qu = 1214,6 ton dan Qijin = 404,9 ton, serta pada Pilar 2 Qu = 1254,1 ton dan Qijin = 418,0 ton. Pada analisis kelompok, daya dukung izin (P izin) juga lebih besar dari Pu, seperti pada Abutment 1 Pu = 2000 ton dan P izin = 6040,29 ton. Penurunan fondasi sangat kecil, antara 0,1406 mm hingga 0,7588 mm, jauh di bawah batas izin 18,5 mm.Dengan demikian, fondasi tiang pancang pada abutment maupun pilar dinyatakan aman dari segi daya dukung tunggal, kelompok, maupun penurunan, sehingga layak digunakan untuk mendukung beban jembatan.

A COMPARATIVE STUDY OF PILE BEARING CAPACITY ANALYSIS RESULTS BASED ON THE EMPIRICAL METHOD (STANDARD PENETRATION TEST) AND THE FINITE ELEMENT METHOD Alfin Reza Saputra Alfin; Dian Purnamawati Solin; Yerry Kahaditu Firmansyah
Jurnal Ilmiah Teknik Sipil Vol. 28 No. 2 (2024): Jurnal Ilmiah Teknik Sipil, Vol. 28 No. 2, September 2024
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2024.v28.i02.p01

This study aims to compare the bearing capacity of steel pile foundations using two approaches: an empirical method based on Standard Penetration Test (SPT) data with Meyerhof’s formula, and a numerical method based on the Finite Element Method (FEM). The research object is a steel pipe pile foundation with a diameter of 850 mm and a depth of 43 meters, used in a port dock structure. Data were obtained from field tests, including bore logs and corrected N-SPT values. The Meyerhof method was applied to manually calculate the end-bearing and shaft friction capacity of the pile, while the FEM approach involved two-dimensional geometric modeling using soil parameters derived from field data and technical assumptions. The analysis results indicate that the Meyerhof method yields an allowable bearing capacity of 7855.23 kN/m², whereas the FEM method results in a capacity of 1432.16 kN/m², with a comparison ratio of 0.1823. This discrepancy suggests that the finite element method provides more conservative and realistic results by thoroughly considering soil-structure interaction. Therefore, the finite element method is recommended for foundation design in large-scale projects or cases requiring high accuracy.

A COMPARATIVE STUDY OF PILE BEARING CAPACITY ANALYSIS RESULTS BASED ON THE EMPIRICAL METHOD (STANDARD PENETRATION TEST) AND THE FINITE ELEMENT METHOD Alfin Reza Saputra Alfin; Dian Purnamawati Solin; Yerry Kahaditu Firmansyah
Jurnal Ilmiah Teknik Sipil Vol. 28 No. 2 (2024): Jurnal Ilmiah Teknik Sipil, Vol. 28 No. 2, September 2024
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2024.v28.i02.p01

This study aims to compare the bearing capacity of steel pile foundations using two approaches: an empirical method based on Standard Penetration Test (SPT) data with Meyerhof’s formula, and a numerical method based on the Finite Element Method (FEM). The research object is a steel pipe pile foundation with a diameter of 850 mm and a depth of 43 meters, used in a port dock structure. Data were obtained from field tests, including bore logs and corrected N-SPT values. The Meyerhof method was applied to manually calculate the end-bearing and shaft friction capacity of the pile, while the FEM approach involved two-dimensional geometric modeling using soil parameters derived from field data and technical assumptions. The analysis results indicate that the Meyerhof method yields an allowable bearing capacity of 7855.23 kN/m², whereas the FEM method results in a capacity of 1432.16 kN/m², with a comparison ratio of 0.1823. This discrepancy suggests that the finite element method provides more conservative and realistic results by thoroughly considering soil-structure interaction. Therefore, the finite element method is recommended for foundation design in large-scale projects or cases requiring high accuracy.

Desain Pengembangan Prasarana Guna Menunjang Digital Branding Wisata Pesisir (Studi Kasus: Desa Kalanganyar, Sidoarjo, Jawa Timur) Yerry Kahaditu Firmansyah; Megahnanda Alidyan Kresnawati; Ade Kusuma; Prayudi Prayudi
Jurnal Desain Vol 9, No 2 (2022): Jurnal Desain
Publisher : Universitas Indraprasta PGRI

PENGARUH FLY ASH DAN FOSROC CEBEX-100 TERHADAP SIFAT MEKANIK TANAH LUNAK YANG DISTABILISASI Farah Salsabila Rahma; Yerry Kahaditu Firmansyah; Himatul Farichah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.50625

The problem of soft soil in infrastructure, specifically in road construction, will cause ongoing issues due to the nature of soft soil, which often undergoes shrinkage and swelling, potentially leading to failure in the structures above it. The solution of stabilizing the soil using chemical methods while also utilizing waste that is harmful to the environment has become very common, such as the use of fly ash material. This research focuses on the stabilization of soft soil using two stabilizing materials, namely fly ash and fosoc cebex-100, to improve the strength of problematic soil so that it can support the load of the construction above it. Fly ash was added at 20%, 25%, and 30% of soil weight, and Cebex-100 at 0,45% of fly ash weight. The sample variations were subjected to physical tests, including Unconfined Compression Tests and shear strength tests, to determine the changes in physical and mechanical properties that occurred after the addition of the additives. The research results obtained from the unconfined compressive strength and elastic modulus parameters showed an improvement as the fly ash composition increased. The soil shear strength test identified 25% fly ash as the optimum variation, resulting in a cohesion value of 34.49 kN/m² and a friction angle of 7.66°. It can be concluded that the addition of fly ash and cebex-100 to problematic soil conditions can improve the physical and mechanical properties of the soil.

COMPARATIVE ANALYSIS OF ANALYTICAL RATIONAL METHOD IN CALCULATING BEARING CAPACITY OF PILE FOUNDATION BASED ON N-SPT DATA AGAINST CAPWAP TEST RESULTS PDA Al Firdaus Nawawi; Yerry Kahaditu Firmansyah; Himatul Farichah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 3 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i3.53509

This research aims to analyze the comparative value of analytical rational methods in calculating the bearing capacity of pile foundations based on N-SPT data. The results of calculating the bearing capacity of pile foundations by analytical methods (Luciano Decourt & Quaresma, Meyerhof, Nakazawa, Terzaghi & Peck, Reese O'Neil, and Vesic & Tomlinson) will be compared to the results of CAPWAP analysis of PDA (Pile Driving Analyzer) tests. The results of this study show that the Meyerhoff (1956) method provides the highest tip bearing capacity values, while the Nakazawa (2000) method produces the highest blanket bearing capacity and total bearing capacity values compared to other methods. Comparison of the ratio of total bearing capacity to CAPWAP showed a range of values from 0,82 to 1,64 with the Terzaghi & Peak (1948) methods providing the highest ratio. The methods with the smallest to largest average comparison values are Nakazawa (2000), Meyerhoff (1956); Luciano Decourt (1982) & Quaresma (1978); Vesic (1977) and Tomlinson (1977); Reese O'neil (1999); Terzaghi & Peak (1948) with average comparison values against CAPWAP of 0.81; 0.88; 1.14; 1.56; 1.57; 1.64 respectively. The comparison of the total bearing capacity of the analytical method to the CAPWAP analysis that is closest to 1 is the Meyerhoff (1956) and Luciano Decourt (1982) & Quaresma (1978) method. Therefore, the most effective analytical methods in calculating the total bearing capacity of piles are Meyerhoff (1956) and Luciano Decourt (1982) & Quaresma (1978) methods.

Analisis Potensi Likuifaksi Menggunakan Data CPT (Cone Penetration Test) Studi Kasus Proyek Konstruksi Tangki Bahan Bakar di Masohi Arifah Ismi Ambiya; Yerry Kahaditu Firmansyah; Bagas Aryaseta; Miguel Felix Wijaya
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31289

The Maluku Province is a region with high seismicity that is vulnerable to liquefaction hazards, particularly in coastal areas with shallow groundwater levels and saturated soil conditions. This study aims to analyze soil behavior indices and liquefaction potential at the construction site of a fuel tank in Masohi, Central Maluku, using Cone Penetration Test (CPT) by comparing the methods of Cetin (2004) and Idriss–Boulanger (2014), as well as comparing the results with previous research by Latifi et al. (2023) using the methods of Olsen (1997), Juang (2003), and Robertson (1998) under different soil conditions. The classification results indicate a dominance of silty clay soils that are potentially susceptible to liquefaction. In the Masohi case study, relatively similar CSR patterns were obtained; however, the Idriss–Boulanger (2014) method yielded higher CSR values compared to the Cetin (2004) method. The CRR analysis revealed significant differences; the Idriss–Boulanger method exhibits higher sensitivity to changes in soil type and parameters, whereas the Cetin method tends to produce more stable values. A similar finding was observed in the study by Latifi et al. (2023), which demonstrated that soil characteristics and calculation formulations result in varying analysis outcomes across methods regarding liquefaction potential as indicated by CRR values.

Analisis Deformasi Lateral dan Getaran Tanah Akibat Pemancangan Tiang pada Pipa Minyak dan Gas Arraya Fredericko Romanza; Yerry Kahaditu Firmansyah; Dian Purnamawati Solin
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31313

The reclamation project of Triangle Island within the Java Integrated Industrial Port Estate (JIIPE) necessitates the installation of driven deep foundations in soft clay deposits adjacent to existing oil and gas pipelines. The pile driving process induces lateral soil deformation and ground vibration, posing a severe threat to pipeline integrity. This study evaluates the geotechnical impacts of pile driving and proposes effective mitigation measures. The structural viability of the foundation was initially validated using the Nakazawa method with corrected parameters for bearing capacity, alongside immediate settlement analysis using the Bowles equivalent raft approach for a 37-meter deep, 600 mm diameter steel pipe pile group. Subsequently, two-dimensional numerical modeling using finite element methods was conducted to simulate lateral soil displacement and ground vibration generated by a Junttan HHK 7A hydraulic impact hammer. Several mitigation scenarios, primarily focusing on pre-boring configurations, were analyzed. The unmitigated numerical results demonstrate that stress and lateral displacement around the pipeline approach or exceed allowable design limits. However, the implementation of optimized pre-boring significantly attenuates soil heave and vibration response, keeping pipeline deformations within safe operational thresholds. These findings provide a robust

Analisis Perbaikan Tanah Lunak Pada Proyek Pembangunan Jalan Tol Probolinggo-Banyuwangi Paket 3 Dengan Berbagai Alternatif Metode Perbaikan Tanah Muhammad Salman Mukhtar; Yerry Kahaditu Firmansyah; Bagas Aryaseta; Miguel Felix Wijaya
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31388

The construction of Probolinggo–Banyuwangi Toll Road Package 3 faces geotechnical challenges due to variations in the thickness of compressible soft soil layers, which may cause excessive settlement and embankment instability. This study aims to analyze the influence of existing soil conditions on settlement and embankment stability and to determine the most appropriate ground improvement methods based on variations in compressible soil thickness. The research employed a quantitative method using secondary data, including Standard Penetration Test (SPT) data, embankment material parameters, ground improvement parameters, and seismic data for pseudostatic analysis. The N-SPT values were corrected and correlated into soil parameters, which were then modeled using PLAXIS 2D finite element software with the Hardening Soil model. The analysis results indicate that at STA 42+675, with a soft soil thickness of 5.5 m, the settlement difference under existing conditions was 16.22 cm and was successfully reduced to 7.9 cm after applying a combination of bamboo piles and bamboo mattress. At STA 45+700, with a soft soil thickness of 12 m, the existing condition experienced collapse during the embankment construction stage, whereas the combination of Prefabricated Vertical Drain (PVD) and preloading produced stable conditions with a settlement difference of 6.54 cm and a seismic safety factor of 1.375. This study concludes that selecting ground improvement methods based on the thickness of compressible soil layers can effectively improve embankment stability and control settlement.

Title

Found 28 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 28 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 28 Documents
Search