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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Aplikasi Teknik Sipil
Syawal Satibi
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Civil Engineering, Building, Construction & Architecture Engineering

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Analisis Kestabilan Lereng Gambut Pesisir Utara Bengkalis Tabah Miftahudin; Syawal Satibi; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Peat soil slope stability is influenced by soil properties, the depth of the water table and the effect of loading or surcharges. Land conversion on areas can cause changes in peatland hydrological balance that led to a decrease in ground water level and causing slope failure. This study analyzes slope stability modeling based on the limit equilibrium principle by Morgenstern-Price method. The current peat slope collapse in the Bengkalis Island North Coast continue to occur by progressive despite to the decline in groundwater levels provide increasing peat slope safety factors.Keywords: Peat slope stability, groundwater level, limit equilibrium slope analysis
Variasi Lebar Pelat Terhadap Daya Dukung Aksial Tarik Fondasi Tiang Helikal Di Tanah Gambut Tiara Mahardika; Ferry Fatnanta; Syawal Satibi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Helical piles is one of the alternative to replace wood pile at a construction over peat soil. Determination of uplift capacity from field test in this research will be interpreted by intersection of tangent method. Uplift capacity of helical pile theoritically calculated using two approches design with individual plate bearing method and cylindrical shear method. This study compared helical pile used diameter 35 cm, 25 cm and 15 cm with variations, wood pile, and pile without helix. The result of the study confirmed that uplift capacity will be increasing with the increment of helix plate diameter and the number of helix. Based on the interpretation data from field test, the capacity of helical pile is closer calculation cylindrical shear method than individual plate bearing method which means uplift capacity of helical pile is derived from shear resistance along cylindrical failure surface and bearing resistance above the top or bottom helix. And other result confirmed that helical pile has the greater uplift capacity than wood pile or pile without helix.Keywords: Helical pile, wood pile, pile without helix, peat soil, helix plate diameter, uplift capacity
Uji Kapasitas Dukung Pondasi Tiang Kelompok Ujung Terbuka Dengan Variasi Pengaruh Spasi Serta Panjang Tiang M. Yusuf Agustamar; Soewignjo Agus Nugroho; Syawal Satibi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

In planning a good structure, it is necessary to consider a geographical factor where the building is built. Soil conditions that generally exist in Indonesia’s coastal is soft soil. As well as, that the most widely used foundation type is the pile foundation. The pile foundation is used to support a structure when a good soil lies at a relatively deep and also if the foundation of the building lies on a fairly high embankment. A number of piles used as pile foundation in one pilecap, where the piles working together to support building. Hence the study of pile foundation needs to be done. One of the studies is modeling of pile in pile grup foundation to find out the bearing capacity of the pile group on sand. Notably, Variation of spacing and length of the pile is determined for this study.The research was done by direct test model on pile foundatio with variation of length 40 cm, 30 cm, and 20 cm and spacing variation with 2.5D, 3D, and 5D also. In brief, the result test in 40 cm lenght pile with spacing 2,5D has the greatest capacity. Obviously the results of the interpretation with the Chin method found a pile with a length of 40 cm and 2.5D pile spacing is the pile with the largest Qult of 2.232 kN followed by a 30 cm long pile with a space 2.5D, as well as the interpretation of Terzhagi and Peck method, the pile with long 40 cm and 2.5D spaces have the largest Qult that is 1.665 kN. To summarize, based on the results of the research can be concluded that the more tight spaced pile then Qult pile will be bigger, and longer pile on the foundation model then Qult also getting bigger.Keywords: Loose sand, Foundation, Pile group, Bearing capacity.
Peningkatan Kuat Tekan Bebas (UCS) Tanah Lempung (CH) Terhadap Penambahan Limbah Bafa (Bottom Ash &Fly Ash) Dan Semen Lala Monang Robert Christian Zega Zega; Syawal Satibi; Soewignjo Agus Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The research aims to increase the compressive strength of soils based on increasing the value of UCS testing. This study uses clay with high plasticity as research objects. Thisis done because the soil type is known to have problems in building construction. The method used is a UCS sample without a marinade which has been compiled accordingto calculations. The mixed samples that have been made are varied based on curing days which are 0 days, 7 days and 28 days with a variation of the cement mixture of 3%and 5% and a mixture of BAFA waste of 4%, 8%, 12% and 16%. a sample naming method is also provided so that it is easy to summarize the results of each test based onplanned variations. Based on the test results that the addition of cement and BAFA increase the free compressive strength (Cu) and compressive strength (qu) of high plasticity soft soil. This increase in value results in an increase in the value of E50 orincrease the stiffness of the UCS sample. The highest increase in UCS occurred in soil with 5% cement and BAFA 16% with 28 days Curing. The increase in qu in the UCS sample was greatest in the variation of sample A-S5-B16-C28 with a value of 94.79 kPa, this increase was 76.57% when compared with the value of qu A which was 22.04kPa. Based on microscopic testing of UCS samples, it can be seen that the higher the level of BAFA and Cement, changes in the structure of the sample look coarser and paler.Keywords : UCS, Microscopic, Cement, Bottom Ash, Fly Ash.
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
Perilaku Daya Dukung Gabungan Fondasi Rakit Tiang Pada Tanah Lunak Yolanda Widyan; Ferry Fatnanta; Syawal Satibi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The development of construction engineering science in water and soft soil areas, to overcome the problem of construction on soft soil, a pile raft foundation solution is chosen. Pile raft foundation system is a blend of pile foundation (pile)with a foundation raft, which works in one unit and simultaneously. Analysis of the bearing capacity of the pile raft foundation is carried out by means of laboratory scale testing and then compared with calculations. In the pile raft foundation, variations in the number of piles were used. The method used to calculate the theoretical bearing data using the Terzaghi method, to obtain the carrying capacity of the test carried out an interpretation of the value of the bearing capacity of the foundation taken from the load value at 25mm settlement, in accordance with ASTM D1143-81. The calculation results and test results show that the combined pile raft foundation can increase the bearing capacity of the foundation. The addition of piles to the raft foundation can reduce settlement and increase the bearing capacity of the foundation. The carrying capacity value is calculated and tested based on a decrease of 25 mm, this is done in order to produce the right results. Keyword: bearing capacity, pile raft, settlement
Mekanisme Keruntuhan Fondasi Tiang Helical Tunggal Pada Tanah Gambut Secara Numerik Menggunakan Model Soft Soil Creep Fadel Muhammad; Syawal Satibi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
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Abstract

Peat is spread widely in Sumatera Island, especially in Riau Province, Indonesia. Peat is included as problematic soil because it has low bearing capacity. The use of helical pile foundation on peat is one of the innovations to increase the peat’s bearing capacity. In this research, numerical modelling of single helical pile foundation load test on peat were carried out, based on the full-scale test conducted by Suratman (2019). The modelling were done by using PLAXIS 2D 2016 program with Axisymetry model type, with the Soft Soil Creep (SSC) soil model. This modelling aimed to know the failure mechanism of model. The parameters used in the modelling were obtained from laboratory test data and field tests and also from trial and error method. The failure mechanism that occurs on the Soft Soil Creep (SSC) model is more likely to be a cylindrical shear failure.Keywords : Peat, Helical Pile, PLAXIS 2D, Failure Mechanism.
Analisis Sistem Penurunan Konsolidasi Multi-Layer Rofika Ratna Ardiansyah; Syawal Satibi; Soewignjo Agus Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
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Abstract

Construction on thick soft soils is often faced by settlement problems, which need particular concern. In order to reduce settlement friction piles are often used. However the effectiveness of group friction piles related to their dimension has not been fully understood. Therefore settlement analysis need to be conducted. In addition, in practice one-point settlement is generally used for preliminary assignment. This approach is considered to be very rough analysis. This research will show the comparison between one-point method and multi-layer method. For group friction pile analysis, simplified boussinesq stress distribution (2 verticals : 1 horizontal stress distribution) is applied in settlement calculation. This research shows that multi-layer settlement calculation is recommended for preliminary settlement assignment. Keywords: friction pile, settlement, multi-layer, stress distribution
Pengaruh Spasi Pada Performa Prefabricated Vertical Drain (PVD) Dalam Perbaikan Tanah Lunak Hayatul Hamida; Syawal Satibi; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
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Abstract

Soil condition heaps of times be a problem in a construction work, it is cause the condition soft soil layer have low permeability. Soft ground improvement with vertical drain  is complex analysis for consolidation, got in on space  of prefabricated vertical drain  (PVD). Space is influential at times of settlement. If space too small then it’s not economical, because it will more point to installation PVD. So, did analysis comparison Chai et al method and average method. This comparison between the two method give the result is not to be different, so installation PVD should be with space 1,5 m. it’s from the result with soil data of PLTU Riau. Keywords: Ground Improvement,  penetrated  vertical drain, degree of consolidation (U)
Perbaikan Sifat Geoteknik Tanah Lunak Lempung (CH) Terhadap Penambahan Semen Dan Limbah Bottom Ash Aditia Siringoringo; Soewignjo Agus Nugroho; Syawal Satibi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Abstract

The work built on the land which high plasticity clay (CH) that has a relatively low carrying capacity will have a short service life. To overcome this problem, efforts are made to improve the geotechnical properties of the soil by stabilizing using bottom ash (coal waste) and cement. The addition of this mixture aims to determine its effect in efforts to improve the physical and mechanical properties of high plasticity (CH) clay. The sample making in this research is based on the variation of bottom ash mixture 5%, 10%, 15% and the variation of the cement mixture is 3% and 5% of the dry weight of the soil. The UCS test was carried out as a reference to see the effect of using a mixture of bottom ash and cement. Testing of UCS samples was carried out based on curing time, with the following curing variations, without curing, 7 days and 28 days. Based on the results of the original soil UCS test, the Cu value is 10.55 kPa and the best mixed soil test value is in the variation of the soil mixture L-S5-BA15-C28 with a Cu value of 30.71 kPa. The conclusion from the research proved that the addition of a mixture of bottom ash and cement was able to increase the Cu value by 291.09% at 15% bottom ash content and 5% cement with a curing time of 28 days. Keywords : Bottom Ash, Cement, UCS, stabilization.
Co-Authors Aditia Siringoringo Fadel Muhammad Ferry Fatnanta Hayatul Hamida Lala Monang Robert Christian Zega Zega M. Yusuf Agustamar Muhardi Muhardi Ridwan Hamdani Rofika Ratna Ardiansyah Soewignjo Agus Nugroho Soewignjo Agus Nugroho Subhan Pytar Wijaya Tabah Miftahudin Tiara Mahardika Yolanda Widyan Yusuf Agustamar