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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Eksergi Jurnal Aplikasi Teknik Sipil
Soewignjo Agus Nugroho
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering

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Daya Dukung Model Kelompok Tiang dan Block Foundation Dengan Variasi Panjang dan Spasi Tiang Soewignjo Agus Nugroho; Syawal Satibi; Subhan Pytar Wijaya; Yusuf Agustamar
Jurnal Aplikasi Teknik Sipil Vol 21, No 2 (2023)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2579-891X.v21i2.10842

Abstract

Analysis of bearing capacity for foundation design is important. Therefore, need an alternative design to know actual capacity of pile group and block. Models of pile group with variations in number, length, and spacing is used on uniform loose sand for proved it. The loading tests conducted on pile models and record p-y curve. The research aims to study effect of number, length, spacing of pile in piles group compared with pile capacity of block. Based on 25 mm settlement of loading test, the result shows block foundation, 3d and 5d spacing has capacity 1560N, 1200N, 1230N respectively on 400 mm length. Analysis of p-y curve with Chin methods, pile capacity of spacing 5d, 3d of pile group and block, in sequence, were 1380N, 1430N and 1660N. Hence, its can be concluded that the pile group in 3d spaced has a larger capacity than 5D spaced.
Efek Penambahan Bahan Aditif Non-Alami terhadap Perilaku Lempung Plastisitas Tinggi yang Distabilisasi dengan Semen Soewignjo Agus Nugroho; Bambang Wisaksono; Heru Suharyadi
Eksergi Vol 20, No 2 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i2.9517

Abstract

Cement is proven increasing the strength of soft clays. Monmorillonite has a high shrinkage. Another hand, Kaolin has a small shrinkage. Waste material usage for stabilization agent was widely carried out this decade. BAFA (bottom ash fly ash) and POFA (palm oil fuel ash) are rich in Silica and Alumina, so they used to substitute of cement. The study examined the effect of Monmorillonite, Kaolin, BAFA and POFA on stabilization of clay with cement. Bentonite from 4% to 16% (is equated to BAFA and POFA, in ratio of 2:1) and Kaolin by 2.5%, used to reduce clay shrinkage, mixed with cement by 3% and 5%. Soil behavior will be reviewed from laboratory tests on curing-noncuring and soaked-unsoaked conditions. The results show changes in Atterberg Limits and Hydraulic Conductivity (permeability, k). Cement as well as BAFA and POFA reduce Plastic Limit greater than Liquid Limit. So, Plasticity Index decreased. It’s can be seen that cement and ash waste decreasing the permeability value. More Ash and less cement, make more impermeable soil. Addition of 3% and 5% cement increased the UCS values from 14.32 kPa to 81.20 kPa and 589.68 kPa and CBR value from 0.78% to 4.20% and 589.68 42.12% respectively
Analisis Daya Dukung Pondasi Tiang Bersirip Pada Tanah Lunak Dengan Variasi Jarak Dan Panjang Sirip Julperizal Julperizal; 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

Soft soil is a soil that has low shear strength. A construction which is built on soft soil usually faces some problems such as low bearing capacity and settlement. Pile foundation is used when a supported soil is located quite far from the surface so that the bearing capacity which can sustain the building has to rely on the skin friction. To obtain the higher pile bearing capacity, several modifications are made including the addition of fins on the pile. This research studies the behavior of finned piles, particulary the relationship between bearing capacity and settlement. Piles were modelled with one and two pair of fins with variations of fin's lengths of 0.50D, 0.75D, 1.0D, and 1.25D. Those piles using the Constant Rate of Penetration (CRP) method. The distances between fins also varies from 3D, 5D, to 7D. The interpretation of loading test data using the Terzaghi and Peck method then it was compared with empirical calculations using the Individual Bearing and Square Shear method.The loading test results show that the length and number of fins affect to bearing capacity of the pile. Piles with 1 (one) and 2 (two) fins are able to bearing greater loads than piles without fin. The largest pile bearing capacity occurs in pile models with fin length's of 1.25D and distance of 5D. The calculation which used the Individual Bearing method produces the value of bearing capacity which is relatively same to the Square Share method. The piles bearing capacity of the model test result is significantly different from the second calculation of the empirical method. The addition of the fins length is more dominant and it improves the piles bearing capacity if it is compared to the change of the distance between the fins.Keywords : Individual Bearing, length of fin pile, Spacing of Fin pile, Square shear
Co-Authors Bambang Wisaksono Ferry Fatnanta Heru Suharyadi Julperizal Julperizal Satibi, Syawal Subhan Pytar Wijaya Yusuf Agustamar