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Ferry Fatnanta
Universitas Riau
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Pengaruh Indeks Plastisitas Tanah Terhadap Koefisien Konsolidasi Vertikal (Cv) Dan Horizontal (Ch) Fauzan Hidayattullah; Ferry Fatnanta; M. Yusa
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Soft soils have instability problems that cannot be tolerated, so when a construction is to be built, the soft soil has to go through several methods of soil repair. One of them is by giving a load above the ground to increase the pressure of pore water in the soil, so that the water that fills the pore space on the ground out so that it causes the volume of pores in the soil to shrink and is also followed by a settlement in soil, this event is called consolidation. Generally consolidation occurs only in the vertical direction (cv), while in this study horizontal direction consolidation (ch) was obtained by modifying the consolidation test by using a membrane to limit the movement of pore water when compressed by the load so that the water moves radially towards the vertical hole containing the sand that has been prepared. This study aims to analyze between vertical consolidation coefficient (cv) and horizontal consolidation coefficient (ch) which is associated with the physical properties of soil namely soil plasticity index through laboratory tests. Therefore, it is necessary to vary soil samples that have diverse physical properties of soil, soil sample variation is obtained by mixing two types of soils that have different soil classifications using weight percentages of 0%, 25%, 50%, 75% and 100%. The results of this study showed soil samples that had a high plasticity index resulted in a greater value of vertical consolidation coefficient (cv) and horizontal consolidation (ch) compared to soil samples that had low plasticity index values. It is also related to the consolidation testing method which has differences in flow length and physical properties of soil samples such as moisture content (w), type weight (Gs) and initial pore number (eo) which affect to time of settlement. Keywords : Soft, soil, Consolidation, Vertical drain, Physical properties, Atterberg limit, Plasticity Index
Perbaikan Tanah Gambut Dengan Metoda Kolom Konfigurasi Segitiga Dari Campuran Fly Ash Dan Bottom Ash Imam Hanafi; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Stone column is a digging and replacement effort undertaken to replace soils to be used as base of construction with compacted vertical columns. In this research, column with fly ash and bottom ash mixtures with 40% fly ash and 60% bottom ash is used.The columns are used as reinforcement of peat soil with triangular pattern. Variations used are 3 cm, 4 cm, and 5,5 cm in diameter (D) with spaces 1,25D, 1,5D, and 1,75D. Loading test was performed to the stabilized peat soil and bearing capacity of the soil was analyzed by 20 mm settlement method and theoretical analysis suggested by Barksdale and Bachus (1983).Results of the 20 mm settlement method obtained maximum bearing capacity is given by 5,5 cm diameter and 1,25 D space variation. The maximum bearing capacity is 9,20 kg/cm2 with an increase of 51,07%. For theoretical analysis of single column, maximum bearing capacity is given by 3 cm diameter and for theoretical analysis of group columns, maximum bearing capacity is given by 5,5 cm diameter and 1,75 D space variation.Keywords : stone column, diameter, space, bearing capacity
Stabilisasi Tanah Lempung Menggunakan Palm Oil Fuel Ash (POFA) Charles AN; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Clays are soft soil which have a low bearing capacity and potentially to failure. Utilization of additive material is an one way that can be applied to stabilize the clay. This study was conducted to determine the effectiveness of using POFA which is a local available material as an one alternative in stabilizing the clay by increasing its bearing capacity. The research focused on the influence of the POFA percentage with CBR value and the value of Cu in the clay stabilization. The results showed that the increasing of POFA percentage and curing process resulted in the increasing CBR and Cu values.  The average increase in the value of CBR curing method 1 to CBR without curing by 0,07% at the top and the bottom of the CBR. whereas for the curing method 2 by 2,29% at the top of CBR and 2,41% at the bottom of CBR. For cu values, the average increase by 1,10 kPa for curing method 1, and 14.65 kPa for curing method 2. It shows an increase in the value of the bearing capacity of the clay.  Key Words: CBR value, cu value, clay, POFA.
Analisis Berth Occupancy Ratio (BOR) Untuk Memenuhi Standar Ultilitas Dirjen Perhubungan laut Pada Dermaga B Curah Cair Pelabuhan Dumai Doris Ade Widyarti; Rinaldi Rinaldi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Berth B (The pour liquid berth) is one of the berth which has a higher activity in Dumai Harbour. Berth B handling cargo activities dominated by CPO with the amount up to 5 million tons each year and come increasing every year. The increasing amount of CPO, need a project to know the value of visiting ships and the value of BOR in short term. Project value is required to evaluate performance of the port so in the future the berth still being capable to manage activities of cargo handling. Based on results of analysis, the value of BOR in short time projection until 2021 is 82.90%. To fulfill The Standard Of Managing Director Of Marine in 2011, the value of BOR was 70% it could be did by adding the lenghth of berth and increase discharge of the pump. The short time projection in 2021 the Berth should be lengthnened formerly 800 meters become 961 meters. Another solution that could be done without adding the length of berth is increased the discharge of pump. The capacity of pump formerly 200 tons/hour, by increased the discharge into 250 ton/hour the value of a BOR become 62.18%Keywords: harbour, berth, cargo handling of CPO, BOR, projection
Analisis Kekuatan Daya Dukung Pondasi Helical Menggunakan Data Sondir Pada Tanah Gambut Galang Maulana; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Bearing capacity of Helical Pile on peat soil can be obtained from cone penetration test (CPT). Bearing capacity based on CPT data is calculated by Bustamante & Gianeselli (LCPC) method, Schmertmann method, method Meyerhoff, Price & Wardle method, and Tumay & Fakhroo method. Meanwhile, there are two methods based on peat soil mechanisms to determine the bearing capacity of the helical pile such a cylindrical shear method and individual bearing method. This research evaluates bearing capacity of the five methods above by implementing two basic methods helical pile on peat soil that most closely to the actual bearing capacity. The results showed that the method Bustamante & Gianeselli (LCPC) to provide bearing capacity that most closely to the actual bearing capacity compared to other methods. Reduction factor is also necessary to modify bearing capacity the foundation Helical. After reduced, bearing capacity of each method has decreased significantly and tends to approach the actual bearing capacity.Keywords: Cone Penetration Test, Helical Foundation, Peat, Capability, Reduction Factor.
Analisis Daya Dukung Pada Tanah Gambut Dan Lanau Menggunakan Cerucuk Kayu Mahang Fajrian Saddek; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Soft soil is one of the soil type with low bearing capacity. Generally the problem that arises in the construction on soft soil is sliding. An attempt to improve low shear resistivity of soft soil can be accomplished through soil reinforcement methods. One of the method is by using wooden pile as foundation. Wooden pile can be resembled as a shortpile, one of a foundation type that widely used in soft soil layer especially to bear a large amount load.This research was conducted through laboratory scale model approach method, but the behavior was made to resemble actual behavior in the field. Wooden pile type that will be used in this research is Mahang Wood and will be installed on peat soil and silt soil. Variations of installed wooden pile are 1 pile, 4 pile, and 9 pile with each pile divided into pile with bark and pile without bark. It is also varied with installation of piles for 1 day and 7 day. It is hoped that such small-scale behavior will result in additional theories of reinforcement in soft soil.The result of this research is the increasing of soil bearing capacity along with the addition of pile number. The bark of the wood pile also affects the bearing capacity. Increased bearing capacity occurs from 1 day to 7 day installation.Keywords : bearing capacity, wooden pile, soft soil, peat, silt
Pengaruhdiameter Pelathelical Terhadap Dayadukung Tekan Pondasi Tianghelical Pada Tanah Gambut Dengan Metoda Pembebananconstant Stress Of Penetration Unzi Marwan; Ferry Fatnanta; Soewignjo Agus Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Foundation type selection is very influential on the building strength. One alternative of foundation type substitute for cerucuk is helical pile. Helical pile manufactured of steel consist of one or more helix-shaped bearing plates fixed to a central shaft that is rotated into the ground to support structure. This research presented the result of static loadingtest of helical pile on peat with constant stress penetration method. Datas of loading test in the form of load and penetration interpretation with Tangent of Intersection method and Terzaghi and Peck method. Pile variation in number and diameter of helix was conducted.Results indicate that addition of number helical will improve bearing capacity of helical pile. At pile that add with different helix's diameter, addition plate helical not affect significant to pile capacity for smaller diameter position on bottom. Comparison staticload test with empirical methods i.e method of Induvidual plate bearing and cylinder shear bearing. To sum up, cylinder shear bearing method more suite to static loading test than individual plate bearing method wiith standar error 0,79 and 1,79 respectivelly.Key words: helical pile, peat, individual plate bearing, cylinder shear
Pengaruh Bentuk Butiran Terhadap Kekuatan Tanah Pasir Frimadofi Frimadofi; Muhamad Yusa; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

There are many factors that affect the sands shear strength. One of the most important factors is the shape of the sand grains. The shape of sands in nature varied greatly, from angled to rounded. Natural sands from the river is usually rounded, while the sands from stone crusher is usually angular. The sands that is expected to be rounded in shape comes from the Kampar River and the sands is expected to have an angular shape from Kota Kijang quarry. In this research, the shape of sand grains were captured using a specified smartphone camera. The image then were analyzed using Image-j software. Direct shear test was carried out on various relative density of dry sands (loose and dense condition). Image analysis shows that Kampar’s sand is sub-rounded, while Kijang’s sand is sub-angular. The value of internal friction angle (ϕ) sub-angular sand is 14% greater in dense conditions and 8.7% greater in loose conditions than for sub-rounded sand. The value of internal friction angle (ϕ) is based on relative density (Dr) in dense conditions greater than 6.3% among fellow sub-angular sands. The value of internal friction angle (ϕ) is based on relative density (Dr) in loose conditions greater than 0.5% among fellow sub-rounded sands.Keywords : Sand, the shape of grain, image-j software, relative density (Dr), shear strength, direct shear test.
Karakteristik Fisis Dan Mekanis Abu Sawit (Palm Oil Fuel Ash) Dalam geoteknik Rizqi Yuliana; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

POFA is an agrowaste ash which is produced from fibers, nut shells, and empty fruit bunches when burnt at temperatures of about 800-10000C in boiler. The production of POFA is rising every year, it is disposed for landfills, now become an important environmental disposal issue. A large area is required for the disposal of these POFA waste materials. The landfill of POFA is the problem for the palm oil industry when it is not reused for any work. POFA contains a large amount of silicon dioxide with high pozzolanic reactivity and has high potential to be used in any engineering work. This research examined POFA characteristics in geotechnical application and its influence by curing periods on 0, 7 and 28 days. In this paper, physical and mechanical characteristics of POFA in geotechnical work will be shown. The chemical composition of POFA prove the existence of SiO2, Al2O3, Fe2O3 and CaO as important substances supporting pozzolan reaction during cured. The result shows that the characteristic of POFA has similar behaviour with sands. Coefficient of permeability decreased during curing periods. Besides, cohesion shear strength, angle of friction, cohesion undrained, and CBR value are improve during curing periods.    Keywords:  POFA, geotechnic, pozzolan reaction
Pengaruh Variasi Diameter Dan Jarak Kolom Campuran Abu Terbang Dan Abu Dasar Dengan Pola Segi Empat Terhadap Daya Dukung Tanah Gambut Aisyah Putri; Muhardi Muhardi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Group of columns that inserted in the soft soil will increase shear strength and density of the soil, reduce soil settlement and liquefaction potential, and increase bearing capacity ofthe soil. Things that must be considered in columns design are diameter, length, space, and pattern of the columns group. This study aims to see the effect of diameter and columnspacing on bearing capacity of peat. Variation of diameter that used in this study are 3 cm, 4 cm, and 5,5 cm. Variation of space that used in this study are 1,25D, 1,5D, and 1,75D.The results of laboratory testing indicate that increasing the diameter dan decreasing the space between columns will increase bearing capacity of stabilized peat. Maximumbearing capacity given by 5,5 cm diameter and 1,25D space variation. The increasing of bearing capacity reaches 74,49%. The results of theoretical analysis give different tendency.Increasing of diameter dan space between columns will increase bearing capacity of the stabilized peat. This tendency difference is due to the influence of overlap between soils withinthe unit cell due to the very close space of the column.Keywords : stone column, diameter, space, bearing capacity
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 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