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Soewignjo Agus Nugroho
Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Veterinary

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Potensi Likuifaksi Tanah Pasir Diatas Tanah Lunak Dengan Variasi Jenis Tanah Lunak Melalui Uji Model Laboratorium Erik Azarya Ginting; Agus Ika Putra; Soewignjo Agus Nugroho
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

In each region has a different type of soft soil, for example peat soils, soft silt soils and soft clay. Pekanbaru, the capital of Riau Province, located on the island of Sumatra where the island of Sumatra itself is an area that has a high intensity earthquake because it is located in the ring of fire. One of the earthquake impact is liquefaction. Liquefaction is a phenomenon in which the strength and stiffness of soil is reduced due to an earthquake or other earth movement. This is a process of changing the nature of the soil from solid state to a liquid state. The aim of this research to figure out the influence of soft soil variation as the native layer of sand embankment and acceleration of vibration against increase of pore water pressure and soil settlement. This research was conducted by laboratory model test using shaking table. Variations of soft soil under sand embankment used are peat soil, soft silt soil and soft clay respectively 10 cm thick and given a uniform load of 40kg / m2. Water level elevation as thick as the sand layer of each variation. The test results showed that silt soil has the largest soil settlement and pore water increase. Silt soil variation tends to require a short period to reach maximum soil sttlement during liquefaction. As the acceleration of vibration increase caused larger soil settlement and pore water pressure, but it required faster time for pore water pressure to stable.Keyword: Liquefaction, shaking table, peat,silt,clay,embankment
Efek Penambahan Abu Serbuk Kayu Pada Lempung Plastisitas Tinggi Yang Distabilisasi Dengan Kapur Dan Semen M Faizal Alridho; Soewignjo Agus Nugroho; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Deposits of high plasticity clays are lay in several locations in Pekanbaru such as Muara Fajar and Minas, Since higher clay plasticity found, soil strength will be reduced when its directly face offto water. Lime has a long time used as a material to reduce soil plasticity, as well as cement. Several types of ash (rice husk ash, fly ash etc.) have also been widely used to improve physical and mechanical properties of clay. Lot of sawing waste are located on the suburb of Pekanbaru city. Theexistence of waste will become a problem in the future. The wood ash was combined with lime and cement. This research was carried out by creating samples, with combining variation of lime and wood ash with clay's that contain 5% cement. Samples for CBR and UCS tests, were carried out withand without curing and soaking. Treatment of specimens was taken of 28 days for curing and 4 days for soaking of each test. The expansion of samples was observed to see swelling of each mixturevariation. This study aims to observe the addition of wood ash to behavior of plasticity, Unconfined Compressive Strength (UCS), Bearing Capacity and Swelling Potential of high plasticity clay. Research shows that for Muara Fajar clay's, by adding cement, lime, and wood ash gradually to the clay, value of plasticity index change from high plasticity clay to high plasticity silt. The maximum value of UCS and CBR occurs on mixture of 90% clay + 10% lime. The curing and soaking treatment also affect to the value of UCS and CBR test. The highest value of UCS and CBR was found in samples in curing of 28 days. The potential swelling pressure of each sample is only 3 kPa.Keywords: Cement, High Plasticity, Lime, Stabilization, Wood Ash
Analisis Daya Dukung Fondasi Tiang Dengan Perkuatan Model Sayap Pada Tanah Lunak Irfan Hasan; Ferry Fatnanta; 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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Advancements in science and technology of civil engineering have led the development of modifications to the shape of pile foundation. Modification of the pile foundation by adding wings to the pile is one way to increase skin friction on soft soil, so that a greater bearing capacity is obtained. In this research, piles were modeled with variations of wing’s lengths of 0.50D, 0.75D, 1.00D, and 1.25D, the distance between wings also varies from 3D, 6D, and 9D. Constant Rate of Penetration (CRP Test) will be used as a method for loading test. The bearing capacity based on loading test data will be analyzed using Terzaghi and Peck method Analysis results showed that winged foundations were able to bearing greater loads than normal piles. The largest pile bearing capacity occurs in pile models with wing lengths of 1.25D and distance of 3D (TS2-1.25D-3D). Addition of wing length until 1.25D will always improve the piles bearing capacity. Unlike wing’s length, addition of the distance between the wings until 9D not always improve the piles bearing capacity. Keywords: Bearing capacity, Constant Rate of Penetration, soft soil, Terzaghi and Peck method, winged foundation
Pengaruh Penambahan Air Di Atas Kadar Air Optimum Terhadap Nilai CBR Dengan Dan Tanpa Rendaman Pada Tanah Lempung Yang Dicampur Abu Terbang Puspa Ningrum; Soewignjo Agus Nugroho; 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

Clays are soft soil which have a low bearing capacity. One of the methods to determine the soil bearing capacity is CBR (California Bearing Ratio). Research on Laboratory for determining CBR value of soil generally performed on condition of optimum moisture content or fully saturated soil. This research evaluates the CBR value of clays with various fly ash contents from OMC to fully saturated. The results showed that, when the soil is compacted at OMC conditions, the effect of saturation resulted will decrease the CBR value up to 67% of CBR unsoaked. When soil is compacted with moisture content above the OMC, increase of water content resulted will decrease the CBR value up to 24%. Furthermore, the addition of fly ash content is effective to improve the CBR value between 20% -25%.  Key Words: CBR, water content, clay, fly ash
Karakteristik Nilai Kuat Tekan Bebas Tanahan Lempung Terhadap Perubahan Kadar Air Dan Tebal Lapisan Pemadat Fikri Hidayat; Soewignjo Agus Nugroho; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Cohesive soil is a type of soil which is requiring a special handling. Clay as a soft soil has bad characteristic, so it needs to be improved in term of stability and bearing capacity. In Indonesia, there are many buildings and civil construction which have been damaged because they were built on expansive clays. For example, in the field we often find bumpy road pavement. This is happened due to poor bearing capacity of the subgrade which contains expansive clays. The aim of this research is to obtain significant factors that influence the UCS value and shape of the crack due to variations in density, moisture content and thickness of the compacted layer. Density variation used was amount of compaction energy. Variations in moisture content were 2% under OMC (OMC-), optimum moisture content (OMC) and 3% above OMC (OMC +). The thickness of the layers was controlled by the weight of the soil of each compaction layer. Moisture content variation results showed that the soil with the moisture content of OMC has largest UCS value. Test results from soil weight per layer showed that the lessest weight of soil, the highest of UCS value. This is because of the weight composition of each layer is evenly distributed. The most extreme collapse occurs in the second layer of each layer weight variation with the center of collapse in the middle layer.Keywords: Moisture content, UCS, soft clay, expansive soil
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
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
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Abstract

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.
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
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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.
Pengaruh Kadar Lempung Dengan Kadar Air Di Atas OMC Terhadap Nilai CBR Dengan Dan Tanpa Rendaman Pada Tanah Lempung Organik Khairatu Zaro; Soewignjo Agus Nugroho; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
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Abstract

Strength and durability of road pavement depend on engineering properties of subgrade. However, soils used as subgrade may not satisfy the required quality. Peat or organic soils is not to advantage of construction because bearing capacity or value of peat soil’s CBR is low. This paper intends to find out more about CBR value of organic soils on OMC and saturated condition . This research investigated the changes of CBR value with moisture content in the range of OMC to saturated. And influenced percentage varied of peat in mixture organic soils (clay and peat). The result of this study showed that for increasing of peat content reduce  CBR values at OMC condition. CBR value  in addition 10% of peat decreased CBR significantly  to 2,88 %  as compared  to original soil (clay) is about 23,88%.  And when compaction of soils with water content above OMC,  incresing content of water reduce  value of CBR.  Key Words: CBR, water content, peat
Perilaku Tanah Lempung Yang Distabilisasi Dengan Abu Sekam Padi Dan Kapur Adnan Ruziq Ihsan; Soewignjo Agus Nugroho; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

A Soil is usually as a base of both building construction and road construction, it becomes a problem if the soil has an inapproriate properties. Materials such as cement, lime, and rice husk ash can be used as stabilization materials to increase soil strength. This study examines the behavior of high plastically stabilized clay with cement, lime, and rice husk ash. The increases of soil performance is seen by CBR test, UCS test, and swelling potential measurements. CBR and UCS test were carried out with 4 conditions; 28 days ripening, 28 days ripening and 4 days immersion, tested directly, and 4 days immersion. The examination of swelling potential was supported by dial on soaked CBR and consolidometer. Soil samples from each varied mixture were loaded with various loads. The results showed that the CBR value and UCS value increase with the duration of ripening and decrease with the length of immersion. Then the CBR and UCS values increase with the addition of lime percentage in the mixture. The highest CBR and UCS values occurs in cement soil 90% + lime 10% with CBR values of 164.34% and UCS values of 1402.97 kPa in conditions for 28 days without immersion. The lowest CBR and UCS values occurs in cement soil 90% + rusk husk ash 10% with a value of 1.68% for CBR and 11.21 kPa for UCS values with conditions soaked for 4 days without immersion. The maximum expansion rate of each sample was reached at pressure of 3 kPa. Keywords: CBR, UCS, Lime, Rice Husk Ash, Cement, Clay, Stabilization
Co-Authors ', Muhardi Aditia Siringoringo Adnan Ruziq Ihsan Agus Ika Putra Agus Ika Putra Alridho, Muhammad Faizal Andarsin Ongko Andius Dasa Putra Ari S. Sibarani Ari S. Sibarani Ari Sandhyavitri Ari Sandhyavitri Arie S Sibarani Arie S Sibarani Arisman Adnan Avrilly Zesthree Mauliza Azra Zulnasari Bahrul Junaidi Bambang Sujatmoko Enno Yuniarto Erik Azarya Ginting Ermiyati Fadhilah, Randy Fajar Restuhadi Fakhri, Fakhri Febrizal Ujang Ferry Fatnanta Fikri Hidayat Giri Prayoga Gunawan Wibisono Gunawan Wibisono Gussyafri Hendra Fernando Ihsan, Adnan Ruziq Imam Suprayogi Inna Kurniati Inna Kurniati, Inna Irfan Hasan Jamili, M Joehari K Khairat Khairatu Zaro Khairul Umam Lala Monang Robert Christian Zega Lala Monang Robert Christian Zega Zega Lembasi, Muhammad Khadafi Lingga Panji Subrata, Lingga Panji M Faizal Alridho M. Shoffar Al Hafizh M. Yusuf Agustamar Mamoru Kikumoto Mohammad Saeri Monita Olivia Muhamad Yusa Muhammad Faisal Al Ridho Muhammad Khadafi Lembasi Muhammad Muhshi Muhammad Yusa Muhardi Muhardi Muhardi Novan, Andre Nurdin Nurdin Ongko, Andarsin Prayogo, Giri Puspa Ningrum Raflyatullah Raflyatullah Raflyatullah, Raflyatullah Randhi Saily Reni Suryanita Rian Trikomara Iriana Rofika Ratna Ardiansyah Roni Indra Lesmana Rosma, Iswadi Hasyim Rudy Suryadi, Rudy Rugun Ermina S. Siswanto Safridatul Audah Saputra, Riola Satibi, Syawal Sayoga, Davin Syamsu Herman Syamsul Arifin Unzi Marwan Usman, Fauzan Wulandari, Deny Zega, Christian Robert Zoni Satria Zulnasari, Azra