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All Journal Jurnal Spektran Research Report - Engineering Science IPTEK Journal of Proceedings Series Jurnal Teknik Sipil International Conference on Engineering and Technology Development (ICETD) JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Deformasi Jurnal Teknik Sipil U Karst Civil Engineering Dimension Dinamisia: Jurnal Pengabdian Kepada Masyarakat Jurnal Aplikasi Teknik Sipil Jurnal Manajemen Aset Infrastruktur dan Fasilitas Journal of the Civil Engineering Forum Indonesian Geotechnical Journal International Journal of Engineering Continuity Jurnal Teknik Sipil
Budijanto Widjaja
Universitas Katolik Parahyangan
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PERBANDINGAN DAYA DUKUNG PONDASI AKIBAT PERBEDAAN METODE KONSTRUKSI PONDASI DALAM Budijanto Widjaja; Sri Ratna Wahyuningsih
JURNAL SPEKTRAN Vol 5 No 2 (2017): Vol. 5, No. 2, Juli 2017
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (851.639 KB)

Abstract

This research uses 4 types of piles as the objects, a bored pile, a continuous flight auger (CFA) pile, a full displacement pile (FDP), and a full displacement pile with an expander body, the depth for all piles is 9.5 m. The bored pile, CFA, FDP, and FPD with expander body have the following diameter: 62 cm, 45 cm, 45 cm, and 22 cm. Each pile, which has different construction method, is tested by full-scale static loading, excluding the FDP with expander body, it uses Osterberg-Cell. The research aims to know which analysis method best suits a particular kind of foundation and to compare each pile capacity. The pile capacity analysis conventionally using t-z and q-z curve gives 13%-15% higher estimation than the static loading test result. Analysis using Plaxis for FDP with expander body gives lower estimation than the Osterberg Cell test result. Keywords: Continuous flight auger, full displacement pile, t-z curve, q-z curve
ALTERNATIF PENENTUAN BATAS CAIR DAN BATAS PLASTIS DENGAN TIGA VARIASI BERAT KONUS MENGGUNAKAN METODE LEE DAN FREEMAN (2009) Budijanto Widjaja; Priscillia Sundayo
Jurnal Teknik Sipil Vol. 14 No. 1 (2016)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (247.082 KB) | DOI: 10.24002/jts.v14i1.1018

Abstract

For fine soils, the most common laboratory tests are Atterberg limits, i.e. plastic andliquid limits. This paper presents two standards for determining liquid limit: ASTM and BritishStandards. Both standards use Casagrande cup and fall cone penetrometer tests. In spite of thefact from its a dvantage and shortcoming, fall cone penetrometer tends the minimum operatormistakes comparing to Casagrande cup. Moreover, a lack for determining plastic limit using byrolling soil samples with three mm in diameter also is caused by operator error. To reduce thathuman error, Lee and Freeman recommend using fall cone penetrometer to obtain plastic andliquid limits by a combination of two distinct weight of cones. In this research, tests wereconducted using two combinations of two different weight of cones. There are 12 remoldedsamples taken from Java and Madura islands. A combination using cones with single anddouble standard weight gives a better result that a combination with single and triple standardweight. The contribution of this research at least gives an alternative way to determine plasticand liquid limits using fall cone penetrometer test. Abstrak: Untuk penyelidikan tanah geoteknik, umumnya pada tanah butir halus diujibatas-batas Atterberg yaitu berupa batas cair dan batas plastis. Makalah ini menyajikandua standar pengujian untuk batas cair yaitu standar ASTM dan British. Kedua standartersebut masing-masing menggunakan Casagrande cup dan fall cone penetrometer. Di balikkelebihan dan kekurangannya, fall cone penetrometer cenderung memberikan nilaikesalahan operator yang lebih rendah dibandingkan dengan Casagrande cup. Selain itu,dengan standar untuk menentukan batas plastis juga memiliki kekurangakuratan karenaproses penggulungan tanah dengan diameter 3 mm tergantung kepada pengalaman operator.Dengan tujuan untuk mengurangi kesalahan manusia tersebut, Lee dan Freemanmengusulkan penggunaan fall cone penetrometer test untuk menentukan batas plastisselain batas cair dengan menggunakan kombinasi dari dua berat konus yang berbeda.Di dalam penelitian ini, pengujian dilakukan dengan menggunakan dua macamkombinasi dua berat konus yang berbeda. Sampel tanah yang diuji adalah sampelremolded sebanyak 12 buah yang tersebar lokasi pengambilan sampelnya di Pulau Jawa danMadura. Hasil penelitian menunjukkan bahwa penggunaan kombinasi konus standar dankonus dengan berat dua kali berat konus standar memberikan hasil yang lebih baikdibandingkan dengan kombinasi konus standar dan konus dengan tiga kali berat konusstandar. Kontribusi penelitian ini sekurang-kurangnya memberikan alternatif lainpenentuan batas plastis dan batas cair dengan menggunakan fall cone penetrometer test.Kata kunci: batas cair, batas plastis, metode Lee dan Freeman, fall cone penetrometer,variasi konus
KAJIAN STABILITAS TITIK P21 LERENG TANGGUL PENAHAN LUMPUR SIDOARJO Budijanto Widjaja; Virda Alfionida
Jurnal Teknik Sipil Vol. 14 No. 2 (2017)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1533.01 KB) | DOI: 10.24002/jts.v14i2.1529

Abstract

Munculnya semburan lumpur panas di Porong Sidoarjo, Jawa Timur sejak tahun 2006, telah mengakibatkan tergenangnya kawasan pemukiman dan pertanian serta memiliki potensi bahwa lumpur tersebut masih tetap menyembur beberapa tahun ke depan. Sejumlah upaya telah dilakukan diantaranya dengan membuat tanggul panahan lumpur. Berdasarkan pengamatan visual yang dilakukan dilihat dari struktur luar tanggul, tanggul masih dalam keadaan yang cukup baik. Tujuan dari penelitian ini adalah untuk mengetahui faktor keamanan terhadap stabilitas lereng pada tanggul Lumpur Sidoarjo terutama pada titik P21. Faktor keamanan yang dianalisis menggunakan program komputer Plaxis. Simulasi dilakukan secara bertahap sesuai dengan urutan konstruksi timbunan yang telah direncanakan hingga saat setelah konstruksi selesai dilaksanakan. Hasil simulasi menunjukkan bahwa faktor keamanan berubah terhadap waktu dan memiliki nilai kritis pada saat konstruksi timbunan selesai dilakukan yaitu sebesar 0.99. Kemudian, faktor keamanan meningkat setelah proses konsolidasi pada tahun ke-8 yaitu 1.59. Secara umum, berdasarkan hasil simulasi ini dan asumsi yang ada, tanggul P21 berada dalam kondisi aman terhadap longsoran.
Evaluating Liquefaction Phenomenon Of Silty Sand Using Piezocone Penetration Test (CPTu) Albert Johan; Paulus Pramono Rahardjo; Budijanto Widjaja
U Karst Vol 6, No 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3773.405 KB) | DOI: 10.30737/ukarst.v6i1.2118

Abstract

Most investigations into liquefaction have focused on clean sandy soils, with time, evidence has grown that liquefaction is often associated with silty sand material. Sibalaya Village, which suffered the greatest damage from the Palu-Donggala earthquake, is dominated by silty sand material. Related to this issue, an experimental study is conducted in the laboratory to understand the behavior of excess pore pressure and the strength of the saturated silty sand under dynamic loading. The experimental study uses several sets of testing apparatus such as a shake table, chamber, and CPTu. The shake table provides a dynamic load for the soil sample. The chamber allows the field environment to be duplicated in the laboratory. The CPTu measures excess pore pressure and strength of the soil sample. The test results show that liquefaction can occur in silty sand material. However, the fine-grain particles cannot generate the overall pore water pressure in which the pore water pressure ratio can only reach 93% of the initial effective vertical stress. Liquefaction also generates increased pore water pressure and a decrease in soil strength. The increase of dynamic load will result in a shorter liquefaction starting time, and fine content strongly influences the pore water pressure behavior, especially on the rate of pore water pressure dissipation after liquefaction occurs. Therefore, based on this research, it is known that silty sand material can experience liquefaction and can have a longer liquefaction period due to its lower permeability.
Evaluating Liquefaction Phenomenon Of Silty Sand Using Piezocone Penetration Test (CPTu) Albert Johan; Paulus Pramono Rahardjo; Budijanto Widjaja
U Karst Vol. 6 No. 1 (2022): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v6i1.2118

Abstract

Most investigations into liquefaction have focused on clean sandy soils, with time, evidence has grown that liquefaction is often associated with silty sand material. Sibalaya Village, which suffered the greatest damage from the Palu-Donggala earthquake, is dominated by silty sand material. Related to this issue, an experimental study is conducted in the laboratory to understand the behavior of excess pore pressure and the strength of the saturated silty sand under dynamic loading. The experimental study uses several sets of testing apparatus such as a shake table, chamber, and CPTu. The shake table provides a dynamic load for the soil sample. The chamber allows the field environment to be duplicated in the laboratory. The CPTu measures excess pore pressure and strength of the soil sample. The test results show that liquefaction can occur in silty sand material. However, the fine-grain particles cannot generate the overall pore water pressure in which the pore water pressure ratio can only reach 93% of the initial effective vertical stress. Liquefaction also generates increased pore water pressure and a decrease in soil strength. The increase of dynamic load will result in a shorter liquefaction starting time, and fine content strongly influences the pore water pressure behavior, especially on the rate of pore water pressure dissipation after liquefaction occurs. Therefore, based on this research, it is known that silty sand material can experience liquefaction and can have a longer liquefaction period due to its lower permeability.
STUDI LABORATORIUM CAMPURAN BIOPOLIMER GLUKOMANAN DAN BEESWAX UNTUK MENINGKATKAN KUAT GESER TANAH PASIR Andra Ardiana; Aswin Lim; Henky Muljana; Heriansyah Putra; Budijanto Widjaja
Jurnal Teknik Sipil Vol. 17 No. 3 (2023)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jts.v17i3.6968

Abstract

Pada saat ini, pemakaian semen Portland (OPC) pada dunia konstruksi mulai dikurangi dan dialihkan ke material yang ramah lingkungan, seperti biopolimer. Biopolimer adalah polimer alami yang berasal dari tumbuhan, hewan, alga, jamur, atau sumber bakteri yang terdiri dari polisakarida. Penggunaan biopolimer sebagai bahan organik memiliki tantangan tersendiri yaitu sifatnya yang sangat sensitif terhadap air dan mengalami biodegradasi. Pada penelitian ini, sifat sensitif terhadap air akan coba dikurangi dengan mencampur sampel pasir silika dengan lilin lebah (beeswax) yang bersifat hidrofobik dan biopolimer yang digunakan adalah glukomanan. Selain itu, metode pencampuran sampel pada kondisi basah dan kondisi kering juga ditinjau untuk memperoleh metode yang lebih baik untuk pencampuran sampel. Hasil uji laboratorium menunjukan peningkatan nilai kohesi sebesar 264,8 kPa dan sudut geser dalam sebesar 44,7 ̊ serta nilai Undrained shear strength sebesar 525,8 kPa dari uji kuat tekan bebas dengan komposisi biopolimer 2 % glukomanan ditambah 2 % lilin lebah. Komposisi biopolimer yang seimbang antara glukomanan dan lilin lebah, suhu pemanasan 110 ̊ C, dan metode pencampuran basah merupakan kondisi yang paling optimal dalam pembuatan sampel uji.
Studi Parametrik Pengaruh Spasi, Panjang, dan Kuat Tarik Geogrid Terhadap Mechanically Stabilized Earth Wall di Boyolali Budijanto Widjaja; Ignatius Tommy Pratama; Daniel Sutanto
Jurnal Aplikasi Teknik Sipil Vol 21, No 4 (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.v21i4.16297

Abstract

Kegagalan dinding penahan tanah yang distabilkan secara mekanis (mechanically stabilized earth retaining wall, dinding MSE) dapat terjadi karena kesalahan desain dan kurangnya referensi terkait penggunaan tanah kohesif sebagai bahan timbunan. Maka, serangkaian studi parametrik dilakukan pada studi ini untuk menyelidiki efek jarak vertikal, panjang, dan kekuatan tarik geogrid biaksial, masing-masing divariasikan dalam tiga nilai, pada stabilitas global dinding MSE dengan ketinggian material timbunan tanah kohesif 15 m di Boyolali. Metode elemen hingga dan metode kesetimbangan batas digunakan dalam penelitian ini untuk mendapatkan faktor keamanan global dinding dan lokasi bidang gelincir terlemah. Selain itu, model material Mohr-Coulomb digunakan untuk memodelkan respon tegangan-regangan pada tanah. Hasil penelitian menunjukkan bahwa pengurangan jarak vertikal geogrid dan peningkatan panjang geogrid dan kekuatan tarik meningkatkan nilai faktor keamanan global dinding MSE. Selain itu, jarak yang lebih pendek, panjang yang lebih panjang, dan kekuatan tarik geogrid yang lebih tinggi juga memengaruhi lokasi bidang gelincir terlemah.
Analysis of Chloride Contaminant Transport in Tailings Storage Facility Dam (Case Study: Gold Mine in Sumatra) Pascayulinda, Devina; Widjaja, Budijanto; Wijaya, Martin
Journal of the Civil Engineering Forum Vol. 10 No. 2 (May 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.9520

Abstract

In the practice of gold mining industry, hazardous waste known as tailings is produced during the ore extraction process. These tailings are typically stored in a dam structure called a Tailings Storage Facility (TSF). The planning and construction of a TSF are critical considerations, as the failure of a TSF can have substantial environmental impacts, pose risks to human safety, and result in industrial losses. Therefore, strict control is necessary in the development of TSFs to minimize the potential negative consequences. This research focuses on the transport of contaminants within a TSF, specifically examining the concentration of chloride contaminants and conducting particle movement analysis. The study utilizes modeling through the GeoStudio SEEP/W program to simulate groundwater flow profiles and the GeoStudio CTRAN/W program to understand contaminant movement over a 100-year period. GeoStudio modeling employs 10 materials: impermeable clay soil, filter sandy soil, transition gravel rock, three mine waste types (Fine, Rockfill, and Rockfill with fine), hard rock bedrock layer, in-situ soil representing the original layer, landslide with colluvial soil, and the tailings itself. Back analysis is employed to iterate model parameters and ensure modeling accuracy against field data, including comparisons with water quality test results and readings from vibrating wire piezometer (VWP) instrumentation. The contaminant transport is influenced by advection-dispersion processes and tends to concentrate within the TSF boundary toward the dam toe over a 100-year timeframe. The analysis emphasizes the influence of advection in contaminant transport and underscores the importance of particle position relative to the groundwater level, with Particle Tracking Analysis shows significant movement within the groundwater flow area. This research provides crucial insights into the dynamics of contaminant concentration, informing better decision-making in TSF planning and management. The findings underscore the imperative of strict control measures to minimize environmental impacts and human safety risks associated with TSFs, thereby advancing knowledge in gold mining waste management.
STUDI ANGLE OF REPOSE MUD VOLCANO DI DESA NAPAN PULAU TIMOR I. R. Naikofi, Mauritius; Widjaja, Budijanto; Rahardjo, Paulus P.
Jurnal Deformasi Vol. 4 No. 2 (2019): JURNAL DEFORMASI
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/deformasi.v4i2.3557

Abstract

ABSTRAKSemburan lumpur vulkanik (Mud Volcano) di pulau Timor (Desa Napan) merupakan aliran lumpur bertemperatur rendah membentuk gunung-gunung lumpur yang berhenti pada ketinggian tertentu dan tumbuhlagi pada titik yang lain. Aliran lumpur alamiah ini membawa massa material berupa tanah dan material berbutir yang terus menerus tanpa harus dipengaruhi oleh adanya aktivitas gunung berapi atau kondisi curah hujan yang tinggi. Letak semburan mud volcano yang sangat dekat dengan permukiman penduduk, memungkinkan terjadinya peristiwa bencana yang akan mengacam bangunan dan kehidupan penduduk dan berdampak juga pada area pertanian. Penelitian ini dilakukan untuk melengkapi penelitian terdahulu oleh Naikofi, dkk. (2017) mengenai sifat aliran lumpur (Mudflow) mud volcano desa Napan. Hasil penelitian angle of repose yang dibentuk oleh gunung lumpur vulkanik tersebut menunjukkan bahwa pada saat variasi kadar airmendekati atau sama dengan batas cair, yaitu pada kadar air sama dengan 27.55% diperoleh angle of repose sebesar 28.710. Penelitian ini dilakukan untuk melengkapi data terpublikasi terdahulu oleh Naikofi, dkk. (2017) mengenai sifat aliran lumpur (Mudflow) mud volcano desa Napan. Informasi ini diharapkan hasilnya mendekatistudi lumpur vulkanik yang dilakukan oleh peneliti-peneliti terdahulu.Kata Kunci : Lumpur vulkanik, gunung lumpur, angle of repose
Laboratory Study on Vallejo and Scovazzo’s Methods in Estimating the Rheology Parameters of Bentonite and Kaolinite Muds Budijanto Widjaja; Ignatius Tommy Pratama; Ian Hartono; Boby Limowa
Civil Engineering Dimension Vol. 26 No. 1 (2024): MARCH 2024
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.26.1.51-62

Abstract

The mud undrained shear strength and viscosity are the essential parameters in understanding the behavior of mudflow. One of the laboratory test methods to estimate the undrained shear strength and viscosity is Vallejo and Scovazzo’s cylinder strength meter test (CSMT) and flume channel test, respectively. This paper compares the undrained shear strength of kaolin and bentonite muds obtained from the CMST to those obtained using the fall cone and mini vane shear tests and also studies the scale effects in the flume channel test in measuring the mud viscosity at a 20o to 40o slope angles and at various liquidity indexes. The results exhibit that CMST could estimate the undrained strength of mud as low as 0.45 kN/m2 with a liquidity index of up to 5.93. Then, the reduction of the size of the flume channel by half resulted in a mud viscosity of about 2.3 times higher.
Co-Authors Abdurahman Hafizudin Adinda Raditya Putri Agusman, Agusman Albert Johan Aldrianita, Tabitha Anandito, Atharayhan Anastasia Sri Lestari Andra Ardiana Aswin Lim Bobby Minola Ginting Boby Limowa Daniel Sutanto David Wibisono Setiabudi Dzaky Mahesa Wibowo Enry Kam Fadhil, Imam Ahmad Felix Hidayat Hartieni, Patricia Helmy Hermawan Tjahjanto Henky Muljana Herni Setiawan I. R. Naikofi, Mauritius Ian Hartono Ignatius A Bagus WP Ignatius Tommy Pratama Imam Ahmad Fadhil Ivan Octora Januar Yeremy Johan, Albert Johannes Adhijoso Tjondro Mauritius Ildo Rivendi Naikofi Nessiana Novita Obaja Triputera Wijaya Pascayulinda, Devina Paulus P Raharjo Paulus P. Rahardjo Paulus P. Rahardjo Paulus P. Rahardjo Paulus Pramono Paulus Pramono Rahardjo Paulus Pramono Raharjo Priscillia Sundayo Priscillia Sundayo, Priscillia Putra, Heriansyah Putra, Mayolus Musa Setiadjie, Samuel Jemmy Shannon Hsien-Heng Lee Siska Rustiani Soerjadedi Sastraadmatja Sri Ratna Wahyuningsih Stefani Wiguna Susanto, Amalia Sylvia Herina Tan Leonardi Theresita Herni Setiawan Vienti Hapsari Virda Alfionida Virda Alfionida, Virda Wahyuning Aila Wibowo, Dzaky Mahesa Wijaya, Martin William, Octavianus Yohanes Lim Dwi Adianto