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Ferry Fatnanta
Universitas Riau
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Journal : Astonjadro

 1 
COMPRESSIVE CAPACITY OF HELICAL PILE FOUNDATION ON PEAT WITH VARIATION OF HELICAL PLATE DIAMETER Adi, Sapria; Fatnanta, Ferry; Satibi, Syawal
ASTONJADRO Vol. 11 No. 1 (2022): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v11i1.5708

Abstract

The use of helical foundations to support structures on peat soil is still a new method. Research is needed to develop this foundation. There are 6 types of helical foundation tested on peat soil. To study the effect of helical plate diameter, plate diameters were varied with sizes 25 cm (M), 35 cm (L), and 45 cm (G). Plate positions (1, 2, 3 plates) are designed at 300 mm spacing. The axial compression bearing capacity test is carried out based on the constant rate of penetration procedure. At the beginning of loading, the load increases significantly. At a certain descent, the load begins to decrease slowly. The load-settlement curve shows that the larger the plate diameter, the greater the load it can withstand. The largest bearing capacity is produced by the GGG 30 foundation (3 plates dia.45 cm), which is 10.83 kN. LLL 30 helical foundation (3 plates dia.30 cm) provides a bearing capacity of 7.14 kN. These results clearly explain that the increase in plate diameter is directly proportional to the increase in the axial compression bearing capacity.
EFFECT OF ADDING WOOD POWDER ASH ON CBR VALUE IN STABILIZED HIGH PLASTICITY CLAY CEMENT AND LIME Nugroho, Soewignjo Agus; Fatnanta, Ferry; Alridho, Muhammad Faizal
ASTONJADRO Vol. 10 No. 2 (2021): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v10i2.5235

Abstract

Cement and lime are widely used as stabilizing agents for soft clays. Some pozzolanic materials have also been used as additives such as asphalt, geosta, fly ash (geopolymer), base ash, salt. Industrial waste such as rice husk ash, coal burning ash (geopolymer) is also used as an alternative for stabilization materials. This research aims to study the effect of sawdust ash, as wood waste, to replace cement and lime on the stabilization of high plasticity clay. The effectiveness of sawdust ash, in this study, was evaluated from the CBR value. The test samples were also reviewed under conditions with and without immersion and with and without curing. Based on the test results, lime is very effective as an additive because it increases the CBR value of more than 100 at a level of 10%. Wood husk ash also increases the CBR value by 100%. The use of cement, lime and wood husk ash requires curing time so that there is a strong bond between the clay and additives. The use of additives without curing did not increase the CBR value. In the stabilization of clay with 10% lime, replacement of lime with wood husk ash by 4%-6%, can be used as a road sub-grade with good quality.
Analysis of the Capability of Pile Assembly Foundations in Soft Soil in Physical Modeling of Variationsiin Laboratory Scale Distances Rahman, Arief; Fatnanta, Ferry; Satibi, Syawal
ASTONJADRO Vol. 12 No. 1 (2023): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v12i1.8139

Abstract

The capacity of raft foundations, pile foundations and pile rafts on soft soil with variations in the distance between the piles. Perform analysis of the carrying capacity and settlement of each foundation test and then compare the results of the theoretical carrying capacity research with the analysis of carrying capacity calculations. The implementation of the test prepares the test along with samples of the raft foundation, pile foundation and pile raft foundation. The test were carried out using a gradual load then a dial gauge is placed at both ends of the sample raft and the load reading is taken. The pile foundation was tested with a decrease of 10 cm while the settlement on the raft foundation and the pile raft foundation was 3 cm, the carrying capacity of the raft foundation was 24 kg, the pile foundation varied 4D distances; 6D and 8D, namely 7.5 kg and the foundation of the pile raft with variations in 4D distance; 6D and 8D are 26 ; 32 and 32 kg. In the interpretation method, the pile raft foundation with various distances increased from 4D to 6D but decreased in 8D. Pile raft foundations with various distances between pile have not a significant effect where raft foundations are more dominant in supporting resistance than pile foundations.
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.
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 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 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