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All Journal Widyanuklida Sinergi Journal of Engineering and Technological Sciences Jurnal Teknik Sipil Journal of Integrated and Advanced Engineering (JIAE)
Endra Susila
Soil Mechanics Laboratory, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung Jl. Ganesa No. 10, Bandung 40132, Indonesia.
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Case Study on Soft Soil Improvement using Innovative and Cost-Effective Reinforcing Techniques Susila, Endra; Agrensa, Fico
Journal of Engineering and Technological Sciences Vol 47, No 2 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (893.325 KB) | DOI: 10.5614/j.eng.technol.sci.2015.47.2.10

Abstract

This paper describes, discusses and compares three new innovations of reinforcement systems for soft soils: (a) a combination of gridded matrass and piles of bamboo, (b) a combination of matrass and piles of bamboo, and (c) a group of mini piles connected by small H-beams with a compacted top layer to hold the top mini piles. First, illustrations and applications of the three types of reinforcement are described from three full-scale field works. Technical bases for the three types are presented, while technical comparisons are discussed next. Finally, conclusions are developed. The case studies, analysis results, and full-scale fieldwork verifications show that the three reinforcement systems have worked properly. Each system has its own advantages and disadvantages in terms of construction duration and cost, capability/effectiveness and material availability, especially in rural areas.
Numerical and Experimental Studies of Wave Propagation Induced by Pile Driving Susila, Endra; Siahaan, Suhermanto; Sinaga, Poltak; Agrensa, Fico
Jurnal Teknik Sipil Vol 21, No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (864.609 KB)

Abstract

Abstract. This paper presents results of numerical and experimental studies to predict the peak particle velocity (ppv) induced by a pile driving. By utilizing a professional finite element software, Plaxis 2D Dynamic, this study analyzed ppv due to pile driving in clays for various soil stiffness and various embedded pile lengths. For verification, a full scale field test of pile driving was performed in East Kalimantan with installed instrumentations of accelerations. Results of both instrumentation and numerical analysis show that ppv depends on distance and soil rigidity. The closer the object to pile tip, the larger the ppv that will be produced. The more rigid the soils at the pile tip, the larger the ppv, too. The results also show that both field test and numerical analysis results are comparable. Finally, this paper proposes a chart to predict the ppv of soils due to pile driving in clays. The output of the proposed method is the predicted ppv for various distances from pile driving location. Abstrak. Paper ini menyampaikan hasil studi eksperimental dan numerik untuk memperkirakan besarnya kecepatan rambat gelombang (ppv) akibat pemancangan tiang pancang. Dengan bantuan software Plaxis ver. 8.2 Dynamic, studi ini menganalisis sejumlah model dengan berbagai variasi kekakuan pada tanah, khususnya tanah lempung (clay) dan berbagai kedalaman fondasi tiang tertanam. Hasil analisis software Plaxis ver. 8.2 Dynamic ini telah diverfikasi dengan hasil studi eksperimental pada sebuah proyek pemancangan fondasi tiang pancang di Kalimantan Timur. Berdasarkan analisis numerik dan data dari pengujian lapangan yang mempunyai hasil yang hampir sama, nilai ppv bergantung dari jarak dari pemancangan dan kekakuan tanah. Hasil dari penelitian ini adalah usulan formulasi prediksi besarnya kecepatan rambat gelombang (ppv) dalam bentuk chart untuk mempermudah menentukan nilai ppv yang akan terjadi akibat pemancangan di tanah lempung. Sedangkan keluarannya akan berupa besaran nilai ppv (peak particle velocity) terhadap jarak pemancangan tiang.
Settlement of a Full Scale Trial Embankment on Peat in Kalimantan: Field Measurements and Finite Element Simulations Susila, Endra; Apoji, Dayu
Jurnal Teknik Sipil Vol 19, No 3 (2012)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1170.699 KB)

Abstract

Abstract. This paper presents a study result of peat behaviors through numerical analysis using the finite element method verified by full scale field measurements. Site investigation, construction, instrumentation and monitoring of a trial embankment on very compressible fibrous tropical peat layers at Bereng Bengkel in Central Kalimantan have been conducted by the Agency of Research and Development, the Indonesia Ministry of Public Works. Settlement responses of the embankment have been investigated by a series of finite element simulations using two different soil constitutive models: elastic perfectly plastic model with the Mohr-Coulomb criteria and hyperbolic Hardening-Soil model. A half space finite element model has been developed using the effective stress approach. Analyses were performed with the coupled static/consolidation theory. The soil parameters, embankment geometry, construction sequence and consolidation time of peats and clays were modeled in accordance with actual field trial embankment conditions. Implementation of the numerical model and simulations has completely been performed by a computer program, PLAXIS 2D. For ground settlement behavior at center of embankment, this study result shows that both soil constitutive models have reasonably produced suitable deformation behaviors. However, the settlement behaviors at embankment toes are not as accurate as they are at center. Abstrak. Makalah ini menyajikan studi perilaku gambut melalui analisis numerik berdasarkan metode elemen hingga yang diverifikasi dengan pengukuran lapangan skala penuh. Investigasi lokasi, konstruksi, instrumentasi dan pengukuran timbunan di atas lapisan gambut tropis berserat yang sangat kompresibel di Bereng Bengkel, Kalimantan Tengah, telah dilakukan oleh Departemen Penelitian dan Pengembangan dari Departemen Pekerjaan Umum Indonesia. Respon penurunan timbinan ini telah dianalisis melalui serangkaian simulasi numerik elemen hingga menggunakan dua model konstitutif tanah: model elastis plastis sempurna dengan kriteria keruntuhan Mohr-Coulomb dan model hiperbolik Hardening-Soil. Model elemen hingga setengah ruang telah dibuat dengan pendekatan tegangan efektif. Seluruh tahapan simulasi telah diperhitungkan sebagai analisis statis/konsolidasi couple. Parameter tanah, geometri timbunan, tahapan konstruksi dan waktu konsolidasi gambut dan lempung dimodelkan sesuai dengan kondisi lapangan. Implementasi dari model dan simulasi numerik ini telah dilakukan menggunakan program komputer PLAXIS 2D. Untuk perilaku penurunan tanah di tengah timbunan, studi ini menunjukkan bahwa kedua model konstitutif tanah dapat menghasilkan perilaku deformasi yang cukup sesuai. Namun, prediksi perilaku penurunan tanah di kaki timbunan tidak seakurat prediksi perilaku di tengah timbunan.
Studi Perilaku dan Mekanisme Interaksi Penggabungan Prefabricated Vertical Drain dan Deep Cement Mixing untuk Perbaikan Tanah Lunak Lesmana, Andri; Susila, Endra
Jurnal Teknik Sipil Vol 23, No 3 (2016)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1937.875 KB) | DOI: 10.5614/jts.2016.23.3.5

Abstract

Abstrak. Permasalahan geoteknik utama untuk konstruksi di atas tanah lunak adalah daya dukung tanah yang rendah dan potensi penurunan yang besar. Penelitian tentang perbaikan tanah yang berkembang saat ini memberikan alternatif-alternatif metode untuk mengatasi masalah tanah lunak. Penelitian ini difokuskan untuk mempelajari perilaku interaksi perbaikan tanah lunak dengan menggabungkan dua buah metode perbaikan tanah yaitu Prefabricated Vertical Drain(PVD) dan Deep Cement Mixing (DCM) Penelitian ini dilakukan dengan memodelkan timbunan di atas tanah lunak dengan bantuan program paket program FE profesional dengan nama PLAXIS 2D dengan menggunakan model material tanah Mohr – Coulomb (MC), Modified Cam Clay (MCC), dan Soft Soil (SS). Hasil studi menunjukan dengan penggabungan kedua metode perbaikan tanah tersebut berpotensi menggabungkan keuntungan dari kedua metoda: PVD yang mempercepat konsolidasi yang terjadi dan DCM yang dapat dapat meningkatkan daya dukung tanah dan mengontrol penurunan tanah.Abstract. The main geotechnical problems for construction on soft soils are the low bearing capacity and excessive settlement. Recent research provides us with methods to address the issues of soft soils. This research focused on studying the behaviors of interaction of combination of two soil improvement methods: Prefabricated Vertical Drain(PVD) and Deep Cement Mixing (DCM). This research was performed by modeling the embankment on of soft soils by utilizing a professional finite element software, called PLAXIS 2D. The elastic-plastic soil model with Mohr - Coulomb (MC)criteria, Modified Cam Clay (MCC) model and the Soft Soil (SS) model were selected to model soils. The results show that the incorporation of both methods can potentially combine the acceleration of consolidation of PVD and the increase of soil bearing capacity and controlling settlement of DCM.
Soil-Structure Interaction of a Piled Raft Foundation in Clay – a 3D Numerical Study Susila, Endra; Anggraini, Nita
Journal of Engineering and Technological Sciences Vol 48, No 4 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1372.258 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.4.2

Abstract

Piled raft foundation designs consider the contribution of the pile cap in transferring load to the ground and distributing load over the piles. The concept of a piled raft foundation requires a comprehensive evaluation of a number of factors that affect the performance of the foundation system. In this research the interaction among piles, pile cap and soil of a piled raft system on medium and stiff clays was studied. The effects of various distances between piles (s/d) in affecting load transfer mechanisms and deformation were considered. The study was performed by utilizing the 3D finite element method with a professional software package called Plaxis3D Foundation. A case study of the piled raft foundation performances of a foundation design for a high-rise building based on the soil stratification in Jakarta was also performed and is presented in this paper.
Behaviors of Pipe-Soil Interaction on Unstable Slopes by Finite Element Simulation Susila, Endra; Agrensa, Fico
Jurnal Teknik Sipil Vol 25, No 2 (2018)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1150.53 KB) | DOI: 10.5614/jts.2018.25.2.1

Abstract

AbstractPipe-soil interaction plays an important role to the pipe stress analysis subjected to soil movement due to slope instability and/or slope failure.  As the soils / slopes begin to fail, a single pipe or a group of pipes buried inside failure zone will bear additional loads which frequently lead to overstress or buckling.  To study this phenomena, a case study was carried out by modelling a group of pipes subjected to ground movement in lateral direction. ABAQUS, a finite element software was employed to establish a 3 D numerical model of pipe-soil interaction during landslide event. Discussions of the results of this analysis are presented by focusing on the behaviors of displacement and stress of the pipes due to slope failure.  Based on the analysis results, the length of failure zone becomes the major cause of the location of maximum stress during slope failure, it should be assessed carefully.AbstrakPada analisis pipe-stress dengan beban dari pergerakan tanah yang diakibatkan oleh longsoran, perilaku interaksi antara pipa dan tanah berperan sangat penting. Ketika tanah/lereng mulai bergerak, sebuah pipa atau beberapa pipa yang dipasang di dalam bidang kelongsoran akan menerima beban tambahan yang seringnya menyebabkan buckling/overstress pada pipa. Untuk mempelajari fenomena ini, studi kasus dilakukan dengan memodelkan grup pipa yang dikenai pergerakan tanah secara lateral. ABAQUS, sebuah program berbasis finite element digunakan untuk memodelkan interaksi antara pipa dan tanah secara tiga dimensi selama longsor terjadi. Diskusi mengenai hasil dari analisis ini dilakukan dengan berfokus kepada perilaku displacement dan stress dari pipa akibat longsoran tanah. Berdasarkan hasil analisis, panjang dari bidang longsor menjadi issue utama dalam penentuan lokasi stress maksimum pipa, sehingga ke depannya perlu dilakukan pemeriksaan secara detail.  
An Evaluation of Pile-Raft Interaction in Cohesive Soils using 3D Finite Element Method Susila, Endra; Syahputra, Muhammad Yoke; Sahadewa, Andhika; Putri, Karina Meilawati Eka
Journal of Engineering and Technological Sciences Vol 51, No 5 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (19.615 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.5.5

Abstract

This paper presents the results of a numerical study of soil-structure interaction in a piled-raft foundation system in clay soil by reviewing the deformation and load transfer mechanism of the piled-raft foundation system. ABAQUS was used to evaluate the interaction in the system, while a Mohr-Coulomb constitutive model was chosen to model the clay soil. Verification of the model was conducted by comparing the simulation result to an experimental laboratory result. The verification result showed that the model used in this research agreed well with the experimental laboratory research. Subsequently, a parametric study was performed by varying the pile spacing, raft size, pile length, and raft thickness. A parametric study was conducted on very stiff and hard clays. This study concludes that the load transfer mechanism in a piled-raft foundation system between the pile and raft foundation occurs after the pile reaches its ultimate capacity and is in the plastic zone.
Penentuan Perubahan Tebal dengan Metode Variasi Densitas Film Suparno Suparno; Makmur Rangkuti; Sutrasno Sutrasno; Bagiyono Bagiyono; Endra Susila
Widyanuklida Widyanuklida, Volume 7 Nomor 1, Juli 2006
Publisher : BATAN

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Abstract

ABSTRAK Perubahan tebal pada suatu material dapat ditentukan berdasarkan persamaan hubungan antara perubahan tebal material dengan densitas film hasil radiografi. Densitas yang dijadikan sebagai acuan adalah densitas pada bagian material yang terdapat perubahan tebal, pada bagian material nominal, dan pada badan IQI tipe lubang yang ditempatkan di atas material nominal. Penelitian dilakukan terhadap material carbon steel bentuk pelat dengan ketebalan 10 mm yang diberi celah datar bawah menggunakan mesin sinar-X Rigaku Radioflex RF-Z50 EGM dengan tegangan tabung 120 KV, dan digunakan IQI ASTM tipe lubang nomor 17. Hasil percobaan kemudian dibandingkan dengan hasil pengukuran menggunakan caliper dan diperoleh perbedaan 15,93%. Hasil penelitian lebih lanjut dengan variasi tebal celah, variasi tebal penetrameter lubang, dan variasi tegangan tabung sinar-X, menunjukkan bahwa penerapan metode ini pada berbagai kedalaman celah dan berbagai tebal IQI diperoleh hasil dengan ketelitian yang hampir sama. Pengujian lebih teliti dapat dilakukan dengan meningkatkan tegangan tabung sinar-X. Berdasarkan hasil yang diperoleh, ketelitian yang paling tinggi sebesar 2,3% didapatkan pada tegangan tabung 150 KV. Penelitian ini merupakan penelitian awal yang perlu dikaji lebih lanjut dengan penerapan metoda statistik dan dikembangkan untuk material lain dengan bentuk geometri yang berbeda baik dengan atau tanpa pelindung (cladding). 
Analisis Evaluasi Program Pelatihan di Pusdiklat BATAN Endra Susila
Widyanuklida Widyanuklida, Volume 13 Nomor 1, November 2013
Publisher : BATAN

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Abstract

ABSTRAK Telah dilakukan analisis terhadap evaluasi program pelatihan Pusdiklat BATAN. Sampel data diambil dari pelaksanaan pelatihan pada Triwulan III tahun 2013 dengan 5 pelatihan yang telah dilakukan yaitu pelatihan: Tanggap Darurat, Pengkajian Dosis, ITN Guru SMA (II), Proteksi Fisik I untuk Medik dan Pengelolaan Limbah Radioaktif. Hasil analisis digunakan untuk perbaikan pelatihan yang akan datang. Analisis dilakukan terhadap hasil evaluasi pada semua komponen program pelatihan yang memiliki nilai pencapaian target mutu kurang dari 70% atau yang memiliki banyak keluhan pelanggan. Berdasarkan hasil analisis evaluasi program pelatihan dengan nilai komponen program kurang dari 70% adalah pelatihan Pengkajian Dosis. Pelatihan yang memiliki banyak keluhan pelanggan pada komponen program adalah pelatihan Tanggap Darurat, ITN Guru SMA (II), Proteksi Fisik I, Pengelolaan Limbah Radioaktif.   ABSTRACT Training program evaluation analysis in the Center for Education and Training - BATAN has been done. Data are taken from 5 training courses in third Quarter of 2013, i.e. Emergency Response Training Course, Dose Assessment Training Course. Nuclear Technique Introduction for Senior High School Teacher II Training Course and Physic Protection 1 for Medical and Radioactive Waste Management Training Course. The result of the analysis is used for maintaining the next training course. Analysis has been done for all training program components which have quality less than 70% or have a 10/ of customer complaints. Based on the training program evaluation result with program component's grade less than 70% is Dose Assessment Training Course. Training courses which has a lot of customer complaints are Emergency Response Training Course, Nuclear Technique Introduction for Senior High School Teacher II Training Course and Physic Protection 1 for Medical and Radioactive Waste Management Training Course.  
Analisis Butir dan Pembuatan Bank Soal Endra Susila
Widyanuklida Widyanuklida, Volume 12 Nomor 1, November 2012
Publisher : BATAN

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Abstract

ABSTRAK Untuk mengetahui soal ujian yang baik atau bermutu dilakukan analisis butir soal dan soal yang baik dapat dimasukkan ke dalam bank soal. Analisis menggunakan metode kualitatif dan kuantitatif terhadap sampel 5 buah soal ujian materi Umum (General) pada pelatihan radiografi Level 1 di Pusdiklat BATAN tanggal 9 — 23 Februari 2009. Sampel soal dilihat kesesuaiannya terhadap aspek materi, konstruksi, bahasa/budaya (kualitatif) dan hasil pengolahan data empirik butir soal tersebut (kuantitatif). Berdasarkan analisis kualitatif soal nomor 30 sesuai dengan semua aspek, sedangkan soal nomor 21, 26, 30,31 dan 36 belum sesuai dengan ketiga aspek analisis kualitatif. Untuk hasil analisis kuantitatif soal direvisi nomor: 21, soal baik nomor 26 dan 36, dan soal didrop (dibuang) nomor: 30 dan 31 didrop. Dari hasil analisis kualitatif dan kuantitatif dapat disimpulkan bahwa soal ujian belum baik sehingga belum dapat dimasukkan ke dalam bank soal.   ABSTRACT To find a good examination questions, has been done an analysis of questions and from the results, the good questions will be incorporated into the question bank. Analysis was performed using qualitative and quantitative methods against 5 questions from the General examination of Radiography Level 1 Training Course, which be held on February 9 to 23, 2009. The questions were reviewed for the compliance to the aspects of materials, construction, language / culture (qualitative) and the processing of the empirical data (quantitative). Based on the qualitative analysis, questions no. 30 fulfilled all aspects to be reviewed, and question number 21, 26, 3031, and 36 did not fulfilled the third aspect of qualitative analysis. From the qualitative and quantitative analysis results, it can be concluded that the questions were not good enough to be put into the question bank.  
Co-Authors Allis Nurdini Andhika Sahadewa Andri Lesmana Asih Suryati Bagiyono Bagiyono Bigman Hutapea Bigman M. Hutapea Dayu Apoji Dayu Apoji, Dayu Edi Edi Fahmi Aldiamar Fico Agrensa Fico Agrensa Fico Agrensa Fico Agrensa Ginanjar, Tetep Karina Meilawati Eka Putri Lesmana, Andri Makmur Rangkuti Maryam Al Lubbu Masyhur Irsyam Muhammad Yoke Syahputra Nita Anggraini Nita Anggraini, Nita Nur Fitra Hadianto Poltak Sinaga Poltak Sinaga, Poltak Putri, Karina Meilawati Eka Ramli Nazir Rizkyani, R. R. Deby Anindya Sugito Sugito Suhermanto Siahaan Suhermanto Siahaan, Suhermanto Suparno Suparno Sutrasno Sutrasno Syahputra, Muhammad Yoke Taufik Taufikurahman Taufikurahman, Taufik Widodo Soemadi