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Ferry Fatnanta
Universitas Riau
Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Physics Public Health Social Sciences Transportation Other

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Karakteristik Kuat Tekan Bebas Stabilisasi Semen Dan Kapur Tanah Cl-Ml Terhadap Siklus Pembasahan Pengeringan Tornando, Hengki; Fatnanta, Ferry; Wibisono, Gunawan
Jurnal Rekayasa Sipil (JRS-Unand) Vol. 16 No. 2 (2020)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.16.2.105-118.2020

Abstract

Menurut grafik Casagrande tanah CL-ML diklasifikasikan tanah yang memiliki nilai indek plastisitas antara 4% - 7%, dan memiliki batas cair berkisar antara 12% - 30%. Beberapa lokasi di Kecamatan Tanayan Raya Kota Pekanbaru terdapat jenis tanah CL-ML, sifat dari tanah CL-ML ini sangat rentan terhadap penambahan kadar air sehingga akan menyebabkan tanah ini menjadi lembek pada musim hujan dan menjadi pecah-pecah pada saat musim kemarau. Dengan adanya sifat ini akan menjadi masalah jika dilakukan suatu konstruksi di atas tanah ini. Salah satu cara untuk memperbaiki  permasalahan ini maka dilakukan stabilisasi tanah. Bahan yang digunakan untuk stabilisasi pada penelitian ini yaitu menggunakan bahan semen dan kapur, siklus pembasahan dilakukan dengan cara merendam sampel pengujian ke dalam air dan siklus pengeringan dilakukan dengan cara sampel pengujian di letakkan (diangin-anginkan) di dalam ruangan terbuka. Hasil penelitian ini menunjukkan bahwa siklus pembasahan dan pengeringan dapat mempengaruhi nilai kuat tekan bebas dari tanah CL-ML. Penambahan 4% kapur dan 3% semen  pada tanah CL-ML meningkatkan nilai kuat tekan bebas. Pada umur pemeraman 0 (nol) hari nilai kuat tekan bebas tanah asli sebesar 133 kPa meningkat menjadi  673 kPa (5 kali lipat), pemeraman 14 (empat belas) hari   dari  142 kPa menjadi 1014 kPa (7 kali lipat), pemeraman 28 (dua puluh delapan) dari 168 kPa menjadi 1513 kPa ( 9 kali lipat).
Analisis Likuefaksi Berdasarkan Data CPT Untuk Perancangan Pondasi Di Pesisir Pantai Kabupaten Kulon Progo DIY Anggara, Vebrian; Fatnanta, Ferry; Yusa, Muhamad
Jurnal Rekayasa Sipil (JRS-Unand) Vol. 16 No. 2 (2020)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.16.2.77-90.2020

Abstract

Yogyakarta Special Region (DIY) is an area that has a high level of seismic activity in Indonesia. This is due to various local faults near the land and its location adjacent to the subduction of the Indo-Australian and Eurasian plates. The proposed new airport is located on the coast in Kulon Progo Regency DIY. The location is dominated by the sands layer and it has high ground water levels which indicate the high potential of liquefaction. The site classes of the coast in Kulon Progo Regency is medium category (SD). Liquefaction analysis using the PGAM value of 0.4 g. Liquefaction has the potential to occur in soil layers 0 - 6 meters. The analysis shows for eartquake of ≥ 6.3 Mw has a very high category of liquefaction. The analysis results has LPI ≥ 29.30 for ground water conditions at the surface, and LPI ≥ 15.32 for ground water conditions in depths of 3 meters. Estimated soil settlements of 19.7 cm for magnitude of 8.1 Mw with ground water conditions at the surface. The use of shallow foundations at soil depths of 0-6 meters is not recommended, unless a soil improvement method is used to eliminate the potential for liquefaction.
Perubahan Nilai Kuat Tekan Lempung Lunak Distabilisasi Dengan Kapur dan Limbah Pembakaran Batubara Zulnasari, Azra; Nugroho, Soewignjo Agus; Fatnanta, Ferry
Jurnal Rekayasa Sipil (JRS-Unand) Vol. 17 No. 1 (2021)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.17.1.24-36.2021

Abstract

Suatu bangunan infrastruktur yang akan dibangun terkait langsung dengan aspek yang paling penting yaitu tanah pendukung, karena berfungsi sebagai menerima dan menahan beban struktural diatasnya. Dalam kenyataannya, tidak semua tanah mempunyai perilaku fisik dan mekanis yang baik, salah satu contohnya ditandai dengan kadar air yang tinggi serta kuat tekan maupun daya dukung tanah yang rendah. Untuk mengevaluasi kemungkinan terjadinya kondisi tersebut maka dilakukan stabilisasi terhadap tanah agar memenuhi persyaratan teknis yang diperlukan. Stabilisasi tanah yang akan ditelaah yaitu perbaikan tanah lempung dengan dicampur zat aditive yaitu kapur, abu terbang serta abu dasar. Kapur dan geopolimer abu batubara, yaitu abu terbang abu dasar, sudah banyak digunakan untuk meningkatkan kuat geser dan daya dukung tanah. Tujuan penelitian adalah mengamati perilaku tanah lempung dengan kembang susut tinggi yang distabilisasi dengan kapur, abu terbang dan abu dasar. Perilaku yang diamati adalah peningkatan kekuatan tanah dengan pengujian laboratorium, yaitu nilai kuat tekan bebas Tanah. Pada penelitian ini pengujian kuat tekan dilakukan dengan 6 perlakuan yaitu:  tanpa pemeraman dan tanpa perendaman; tanpa pemeraman dengan perendaman; pemeraman 7 hari dengan tanpa perendaman; pemeraman 7 hari dan perendaman; pemeraman 28 hari dan  tanpa perendaman, serta pemeraman 28 hari dan perendaman. Hasil penelitian menunjukkan bahwa nilai kuat tekan tersebut akan semakin meningkat seiring dengan lamanya waktu pemeraman. Begitu juga dengan semakin bertambahnya persentase zat aditif maka nilai kuat tekan juga cenderung semakin meningkat. Sedangkan dengan perlakuan pemeraman terhadap sampel mengakibatkan penurunan nilai kuat tekan. Nilai kuat tekan tertinggi berada pada Variasi VI sebesar 1506,158 kPa pada kondisi pemeraman 28 hari dan tanpa perendaman dimana persentase bahan tambah yang terkandung yaitu 25% abu terbang, 15% abu dasar dan 5% kapur. Sedangkan nilai Kuat Tekan Bebas terendah pada Variasi III sebesar 120,442 kPa pada kondisi tanpa pemeraman dan perendaman dengan persentase bahan tambah yang terkandung yaitu 10% abu terbang, 15% abu dasar dan 5% kapur.
Permeability Prediction for Expansive Soil Based on Physical Properties Using Artificial Neural Networks Fatnanta, Ferry; Suprayogi, Imam; Ranata, Nicola Rabb; Nugroho, Soewignjo Agus; Putra, Agus Ika
Makara Journal of Technology Vol. 27, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Permeability is a soil parameter related to the construction industry to understand the processes of infiltration, runoff, and settlement. The risk of testing errors is inevitable in permeability investigations, especially in expansive soils. Trial and error in permeability testing becomes difficult due to soils with small pore sizes and large shrinkage expansion. Several studies related to soil physical properties that affect permeability have been conducted. However, the correlation results obtained still have poor accuracy. Artificial neural networks (ANN) are machine learning systems that can change their structure to solve problems that are included in the system. The use of ANNs in data learning is applied to help the established model predict future output values with a small error value. This research aims to study the correlation between the physical properties of expansive soil that affect its permeability using ANN correlation and then produce correlation equations for future inputs. The research was conducted with input data in the form of soil liquid limit, soil plasticity index (IP), %fine grains, and soil permeability as output data. Results demonstrated a good correlation between soil physical properties and permeability, revealing high accuracy in the output regression equation.
Correlation of CBR Values and Mackintosh Probe on Clay Soil with Variations of Bentonite, Kaolin and Sand Nugroho, Soewignjo Agus; Fatnanta, Ferry; Wibisono, Gunawan; Muliyono
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24252

Abstract

Coastal areas are typically characterized by non-uniform soil properties, often featuring soft, water-saturated soils with high plasticity, which frequently results in low soil bearing capacity. This study aims to investigate the relationship between California Bearing Ratio (CBR) values and Mackintosh Probe (MP) test results by utilizing a mixture of clay soil comprising bentonite and kaolin with sand in various compositions. These mixtures were prepared as laboratory test samples to simulate the soil conditions in these areas. The primary objective of this research is to develop a faster and more efficient alternative method for estimating soil bearing capacity in coastal regions. A total of 81 samples were prepared with variations in moisture content, compaction levels, and the composition of sand and clay mixtures. Testing was conducted using both CBR and MP methods. The analysis revealed a significant positive correlation between MP and CBR values, represented by the linear regression model: CBR = 0.7498 * MP, with a coefficient of determination (R²) of 0.9542. This indicates that approximately 95.42% of the variation in CBR values can be predicted from the MP test results. The model's accuracy was further validated through training and testing using 5 randomly selected data points from the sample set. The findings suggest that the Mackintosh Probe can serve as a preliminary tool for estimating soil bearing capacity in coastal areas, particularly in field conditions where laboratory equipment is limited. However, for broader applicability, further validation of this model is necessary to accommodate more complex soil conditions in the field.
Numerical Analysis of The Effect of Creep on The Settlement and Failure Pattern of Helical Piles Foundations Satibi, Syawal; Fatnanta, Ferry; Aprillia. H.R., Bella
ASTONJADRO Vol. 14 No. 4 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i4.19152

Abstract

Peat soil is a unique type of soft soil that has a low bearing capacity and experiences significant creep effect. This inherent challenge necessitates effective improvement methods to enhance its stability, among which helical pile foundations stand out as a viable solution. Despite their promising application, the nuances of how creep influences the performance of these helical piles in peat soil remain largely unexplored. This study aims to analyse the effect of creep on the settlement and failure pattern of helical pile foundations in peat soils. Axis-symmetric two-dimensional numerical analyses using the finite element method were carried out to model helical piles foundations with varying creep indices (Cα) and differing spacings between the helical plates (1D and 3,5D). The results showed that the effect of creep caused the settlement of helical piles to increase as the value of Cα increases. However, the changes of excess pore water pressure around the helical pile foundation were not significantly affected by the variation of Cα value. In addition, the failure patterns of helical piles foundations were not affected by the creep effect, with the failure mechanism still following the cylindrical shear pattern for the 1D inter-plate spacing and the individual bearing pattern for the 3,5D inter-plate spacing. This study provides insight into the importance of considering the effect of creep in the design of helical piles foundations in peat soils for long term use.
PENGARUH KEPADATAN, TEBAL LAPIS, KADAR AIR, SERTA ENERGI KOMPAKSI PADA NILAI KUAT TEKAN BEBAS Soewignjo Agus; Fatnanta, Ferry
Teras Jurnal : Jurnal Teknik Sipil Vol. 16 No. 1 (2026): Teras Jurnal
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v16i1.1306

Abstract

Abstrak   Tanah kohesif, khususnya lempung lunak dan lempung ekspansif, menimbulkan tantangan significan dalam proyek teknik sipil karena karakteristik geoteknik nya yang kurang baik. kegagalan pada konstruksi sipil, seperti perkerasan jalan, sering terjadi akibat daya dukung tanah yang rendah yang diakibatkan oleh lempung plastisitas tinggi. Penelitian ini bertujuan untuk mengevaluasi faktor-faktor utama yang mempengaruhi nilai Unconfined Compression Strength (UCS) dan mengamati pola keruntuhan yang sesuai terutama di bawah kondisi pemadatan yang kurang seragam. variabel utama yang di selidiki adalah kepadatan tanah (dikontrol oleh energi pemadatan), kadar air, dan ketebalan lapisan pemadatan (dikontrol oleh massa tanah per-lapisan). kadar air divariasikan menjadi tiga kondisi: di bawah kadar air optimum (OMC), pada OMC, dan di atas OMC. Variasi ketebalan lapisan dirancang untuk mensimulasikan pemadatan lapangan yang non-seragam, diatur dengan mengontrol massa tanah pada setiap dari tiga lapisan yang dipadatkan. Hasil pengujian secara konsisten menunjukan bahwa tanah yang dipadatkan pada nilai OMC menghasilkan nilai UCS tertinggi sebesar.... Lebih lanjut, variasi ketebalan lapisan menunjukan bahwa semakin kecil massa tanah per lapisan (yang menghasilkan lapisan yang lebih tipis dan lebih padat), semakin besar pula nilai UCS yang dihasilkan. Peningkatan kekuatan ini disebabkan oleh distribusi energi pemadatan yang lebih merata di seluruh lapisan. temuan paling penting dari studi ini adalah bahwa bidang keruntuhan paling kritis didominasi terlihat pada lapisan tengah sampel, terutama pada spesimen yang dipadatkan secara non-seragam. hal ini mengindikasikan bahwa antar muka antara lapisan pemadatan yang tidak seragam berpotensi menjadi zona kelemahan yang memerlukan pertimbangan cermat dalam aplikasi konstruksi di lapangan.   Kata kunci: lempung plastisitas tinggi, kuat tekan bebas (UCS), energi pemadatan, kadar air, kepadatan non-seragam, ketebalan lapisan.   Abstract   Cohesive soils, especially soft clay and expansive clay, pose significant challenges in civil engineering projects due to their poor geotechnical characteristic, such as road pavement, often occurring due to low bearing capacity caused by high plasticity clay. this research aims to evaluate the main factors that influence the Unconfined Compression Strength (UCS) and observe the corresponding failure patterns, especially under uniform compaction conditions. The main variables studied are soil density (controlled by compaction energy), water content, and compaction layer thickness (controlled by soil mass per layer). the water content was varied into three conditions: below optimum moisture content (OMC), at OMC, and above OMC. Variations in layer thickness were designed to simulate non-uniform field compaction, arranged by controlling the soil mass of each of the three compacted layers. consistent testing result show that soil compacted at the OMC value produces the highest UCS value. Furthermore, variations in layer thickness indicate that the smaller the soil mass per layer (resulting in thinner and denser layers), the greater the resulting UCS value. The increase in strength is due to a more even distribution of compaction energy throughout the layers. the most important finding of this study is that most critical failure plane is dominantly observed in the middle layer of the sample, especially in specimens compacted non-uniformly, indicating that non-uniformly compacted layers have the potential to become weak zone that require careful consideration in field construction.   Keywords: high plasticity clay, unconfined compressive strength (UCS), compaction energy, water content, non-uniform compaction, layer thickness
Sifat Fisik Tanah Berpengaruh Terhadap Kuat Geser Tanah Wilayah Pesisir Menggunakan ANFIS Oktareza, Ewis; Fatnanta, Ferry; Suprayogi, Imam
Journal of Infrastructure and Civil Engineering Vol. 6 No. 1 (2026)
Publisher : Program Studi Teknik Sipil Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/jice.v6i1.160

Abstract

Tanah pesisir didominasi lempung marin dan tanah organik tinggi dengan kuat geser rendah, kompresibilitas tinggi, dan sensitif terhadap kadar air serta salinitas, sehingga meningkatkan risiko kegagalan infrastruktur. Penelitian ini mengevaluasi kinerja metode soft computing, Adaptive Neuro-Fuzzy Inference System (ANFIS), dalam memprediksi kuat geser tak terdrainase (Cu) serta menentukan parameter sifat fisik tanah paling dominan. Data terdiri dari 190 tanah pesisir, meliputi kadar air, berat isi, berat jenis, Atterberg limit, dan liquidity index. ANFIS diterapkan menggabungkan jaringan saraf dan logika fuzzy untuk menangkap hubungan nonlinier dan ketidakpastian data. Hasil menunjukkan ANFIS memiliki performa terbaik (R All = 0,8443; RMSE = 0,1673). Analisis ANFIS dengan performa terbaik mengidentifikasi Plastic Limit (PL) dan Specific Gravity (Gs) sebagai faktor utama yang mempengaruhi kuat geser (Cu). Penelitian ini menunjukkan bahwa komposisi mineral dan densitas partikel tanah di wilayah pesisir berdampak signifikan pada kuat geser tanah, serta efektivitas ANFIS dapat dijadikan alat prediksi awal untuk perencanaan geoteknik dan mitigasi risiko infrastruktur pesisir.
Co-Authors ', Muhardi . Zulfan Abdul Halim Muqorrobin Abdullah Ihsan Alkubuwi Achmad Noerkhaerin Putra Adi, Sapria Adi, Sapria Adnan Ruziq Ihsan Agus Ika Putra Agus Nugroho, Soewignjo Aisyah Putri Al Ridho, Muhammad Faisal Albajili, Farian Alfian Alfian Alfian Malik Alridho, Muhammad Faizal Andius Dasa Putra Anggara, Vebrian Aprillia. H.R., Bella Aras Mulyadi Ari Sandhyavitri Arief Rahman Arifan Farhan Ariza, Ariza Azizah . Azra Zulnasari Bramson P Manik, Bramson P Charles AN Daniel Irfan Dede Subhan Dodi Pratama Dodi Pratama Doris Ade Widyarti Effendi Sianipar Ela Fitriana Endala Siboro Epi Mili Yanti Erwin Satria Anugrah Fachry Abda El Rahman Fadel Muhammad Fadhilah, Randy Fadhlurrahman, Fadhlurrahman Fadlan Fadlan Fajrian Saddek Fauzan Hidayattullah Fauzi, Manyuk FERI SETIAWAN Fikri Ananda Fikri Hidayat Frimadofi Frimadofi Galang Maulana Gina Purnama Sari Giri Prayoga Gunawan Wibisono Gunawan Wibisono Gussyafri Gustika, Rani Ardeylina Hadiyan Putra, Hadiyan Haryo Dwito Armono Hasibuan, Putra S Hengki Tornando Herli Fajri Himmatul Azizah HR, Bella Aprilia Ihsan, Adnan Ruziq Imam Hanafi Imam Suprayogi Irfan Hasan Iskandar Romey Sitompul Joshua, Norman Julperizal Julperizal Khairatu Zaro Laksono Trisnantoro Lembasi, Muhammad Khadafi Lingga Panji Subrata, Lingga Panji Lisa Trisnawati Lubis, Shakila Fuadah M Faizal Alridho M. Yusa Maulidi, M Aldi Monita Olivia Mufriadi Mufriadi Muhamad Yusa Muhammad Ikhsan Muhammad Khadafi Lembasi Muhammad Naufal Muhammad Rico Saputra Muhammad Safrianda Muhammad Yevizal Muhammad Yusa Muhardi Muhardi Muhardi Mukhelnalis Sutazril Muliyono Nova, Septi Devita Novan, Andre Oktareza, Ewis Ongko, Andarsin Prayogo, Giri Rafika Rani Zainuddin Rahman, Sayful Ralan Ditra Ranata, Nicola Rabb Remon Muslim Riady, Azhar Rinaldi Rinaldi Rinaldi Rinaldi Rio Hidayat Rio Zambika Rizqi Yuliana Rizqy Ridho Prakasa Robi Handi Putra Ronny Tigor Sitanggang S A Nugroho Said Defri Ariandi Saputra, Adetia Saputra, Riola Satibi, Syawal Satria, Zoni Sayoga, Davin Simanjuntak, Lambok Jadiaman Soewignjo Agus Soewignjo Agus Nugroho Soewignjo Agus Nugroho Sofyan Subhan, Dede Suhaimi Siregar Suratman Suratman Suryadi Ramadhan Sutikno, Sigit Syamsul Arifin Tiara Mahardika Tornando, Hengki Trimaijon Trimaijon Trimaijon, Trimaijon Unzi Marwan Usman Muhammad Tang Usman, Fauzan Vebrian Anggara Wahyudi Citrosiswoyo Wahyudi Citrosiswoyo Wahyudi Citrosiswoyo Widi Agoes Pratikto Widi Pratikto Widi Pratikto, Widi Wulan Sri Rahayu Wulandari, Deny Yolanda Widyan Yoyon Kurniawan Yusa, M. Yusa, Muhammad Zoni Satria Zulnasari, Azra