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All Journal Economic Journal of Emerging Markets Mitra Sains Agroland : Jurnal Ilmu-Ilmu Pertanian AGROTEKBIS Jurnal Online Mahasiswa (JOM) Bidang Pertanian Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Riau Journal of Computer Science Jurnal Ilmiah Universitas Batanghari Jambi Jurnal CoreIT Jurnal Laut Khatulistiwa International Journal of Supply Chain Management Jurnal Informasi dan Komputer Unes Law Review Jurnal Daur Lingkungan Journal of Robotics and Control (JRC) Maspul Journal of Community Empowerment Jurnal Integrasi Kesehatan dan Sains Jurnal Ilmu Komputer Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences JUSTIN (Jurnal Sistem dan Teknologi Informasi)
Muhardi Muhardi
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Efisiensi Tiang Group Konfigurasi 2x2 Fondasi Helical Pile pada Tanah Gambut Fadlan Fadlan; Ferry Fatnanta; Muhardi Muhardi
Jurnal Ilmiah Universitas Batanghari Jambi Vol 19, No 3 (2019): Oktober
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (723.886 KB) | DOI: 10.33087/jiubj.v19i3.760

Abstract

Installation of helical pile foundations in different formations and distances will provide different bearing capacities in peat soils. For this reason, a correction value to the bearing capacity of the pile group is required, which is stated with efficiency. This paper aims to analyze the bearing capacity of the helical pile group configuration 2x2 with variations in the distance between the piles of 1.5D, 2.0D, 2.5D, & 3.0D on peat soils, as well as obtaining the efficiency values from the bearing capacity and from the Converse–Laberre formula. The analysis shows the efficiency of the pile for the distance between the 1.5D pile is 0.99, the distance of 2.0 D is 0.93, the distance of 2.5D is 0.86, and the distance of 3.0D is 0.79. The efficiency obtained from the Converse-Laberre formula for a distance of 1.5D is 0.44, a distance of 2.0D is 0.56, a distance of 2.5D is 0.64 and a distance of 3.0D is 0.70.
Preferensi Mahasiswa dalam Meningkatkan Human Capital Melalui Program Pascasarjana Muhardi Muhardi; Sundaya Sundaya
Economic Journal of Emerging Markets Volume 11 Issue 3, 2006
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ejem.v11i3.525

Abstract

This paper described any factors that influential probability college student’s to studying in pascasarjana program’s. Further, there are behaviour’s analysis specifically both college student’s who are to become a member of campus organization and college student’s who are not to become a member of campus organization. To achieve its, we use linear probability model (probit). Estimation result’s are first, its probability significantly determined by age, number they younger brother and sister, and then by estimate of gross benefit from earning after they work with master title’s. Second, probability college student’s who are to become a member of campus organization to studying in pascasarjana program’s exceed probability college student’s who are not to become a member of campus organization.Keyword: graduate program, human capital, probit model
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
Karakteristik Mekanis Dari Campuran Abu Terbang Dan Abu Dasar Dalam Geoteknik Ridwan Hamdani; Muhardi Muhardi; Syawal Satibi
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

Generally, coal are used for fuel by industry factory at Indonesia. Coal burning produce two of kind waste, that is fly ash and bottom ash. Utilization of coal waste is not optimal yet at this time. This research aims to find out optimum percentage from fly ash and bottom ash mixed by mechanical strength and to know curing effect for 0 and 28 days. The result of proctor standard is increasing proportion bottom ash content on fly ash and bottom ash mixed, then increased dry density maximum while optimum moisture content is decreased. CBR value is increased with increasing bottom ash content. From UCS test, value shear strength (cu) is decreased because increasing bottom ash content. Value from CBR, UCS and Triaxial test is increased after curing for 28 days.Keywords: coal, fly ash, bottom ash, mixed, mechanic characteristic
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 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
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
Karakteristik Pull - Out Resistance Tulangan Sebagai Perkuatan Pada Tanah Lempung Said Defri Ariandi; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Ground improvement by using reinforcement developed rapidly in recent decades. Since it was first introduced by Vidal (1966), this method is suitable to reduced the deformation of both lateral and vertical deformation. Clay materials used because of its availabilityand lower cost, clay have shown good performance as embankment, and for the reinforcement material using 10 mm steel bar. This laboratory-scale test prepared at two dry side water content, two wet side water content and optimum water content (OMC), while the pullout resistance from longitudinal reinforcement. Pullout resistance reinforcement would be highest when the water content of clay are in optimum condition, adhesi is the dominant force in this pullout resistance test. Keywords: Pullout resistance, water content, reinforcement
Co-Authors Abd. Hadid Abubakar M. Lajhie Aisyah Putri Aldi, Aldi Alex Kurniawandy Amiruddin Sahabu Anggriana, Anna Anita Febriani Annesia Malantiyaz Arnis En Yulia Benni Harianto Naibaho Charles AN Christoporus, Christoporus D Gandana Madjakusumah Dance Tangkesalu Darsin Darsin Dedy Yasriady Devi Melisa Veronica Dewa Ariembawa Diandra, Roni Dodi Pratama Effendy Effendy Efrian Saputra Ellia Marlina Fadlan Fadlan Fajrian Saddek Ferry Fatnanta Fonda, Hendry Galang Maulana Gunawan Wibisono Hadiyan Putra, Hadiyan Hamida, Hayatul Handri Handri Hayatul Hamida Holid Holid Imam Hanafi Indah Fitriana Juliasman, Rendy Dwi Krisna, Daniel Surya Lita Darmayanti M. Nur Sangadji Made Antara Mahfudz Mahfudz Maman Sutisna Muh Fardhal Pratama Muhammad Basir Cyio Muhammad Hafizh Anwar Muhammad Naufal Rivan Muhammad Rofiq Muhammad Syafnil Ramadhan Muhd Nur Sangadji Nurchi Syahri Ordila, Rian Parlan, Parlan Prayitno, Dwi Imam Puspa Ningrum Rahma Silva Anita Ralan Ditra Refni Wahyuni Reynaldi Saputra Ridwan Hamdani Rio Hidayat Rizqi Yuliana Robi Handi Putra Roni Indra Lesmana Rosianti Mokoginta Rostiati Dg Rahmatu Rustam Abdul Rauf s, Pirmadona Sabna, Eka Said Defri Ariandi Salsabila Hasanah Sanjaya, Gigih Saputra, Adetia Sentana, Jeri Trio Soewignjo Agus Nugroho Sri Anjar Lasmini Sri Suwarsi Sundaya Sundaya Suryadi Ramadhan Syafrinal, Syafrinal Tabah Miftahudin Toni, Afriwan Wardah Wardah Warsidah, Warsidah Wijaya, Agus Sunar Winda Sari Yani Oktavia Yohanis Tambing Yuda Irawan Yulia Beikircher Z, Harist Febrie R Zalna, Zalna