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Slope Stability Analysis of the Bener Dam Cofferdam Using PLAXIS Application for Main Dam Construction Safety Halim, Ferdiansyah Imran; Wardani, Sri Prabandiyani R; Sadono, Kresno Wikan
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.68004

Abstract

Slope stability is one of the methods used to determine the safety factor of a hydraulic structure, such as a cofferdam. A cofferdam functions to retain water and divert it into a diversion channel, which may be in the form of a conduit or tunnel. Assessing the safety factor of a cofferdam is crucial to ensuring the smooth progress of dam body embankment work. While many studies have been conducted on dam body slope stability, research on cofferdam slope stability remains limited. This study aims to analyze the slope stability of the Bener Dam cofferdam using the finite element method with the PLAXIS application to ensure that the main dam construction remains unaffected. The data used for slope stability analysis were obtained from the Final Report of Bener Dam and several literature sources. The slope stability modeling was evaluated under three conditions: after construction (empty water level), flood water level, and rapid drawdown. The results indicate that the safety factor values for all three conditions exceed the required threshold, with values of 1.369 for after construction, 1.824 for normal water level, and 1.215 for flood water level. These results confirm that the main dam construction is not affected by the stability of the cofferdam.
Vertical Deformation of Manikin Asphalt Concrete Core Dam Using Mohr-Coulomb and Hardening Soil Material Models with Plaxis 2D Software Gewangga, Arya Bakti; Sadono, Kresno Wikan
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67680

Abstract

EVALUASI PENGARUH TIMBUNAN DAN STOCKYARD PANCANG TERHADAP KEGAGALAN PANCANG (STUDI KASUS: PROYEK JEMBATAN X DI KALIMANTAN) Matheus, Patrick; Hartono, Darwin; Sukamta, Sukamta; Sadono, Kresno Wikan
Rang Teknik Journal Vol 8, No 2 (2025): Vol. 8 No. 2 Juni 2025
Publisher : Fakultas Teknik Universitas Muhammadiyah Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31869/rtj.v8i2.6722

Abstract

One of the bridge projects in Kalimantan is built on soft soil. Soft soil has poor bearing capacity, low shear strength and permeability, and high compressibility. One of the substructures of the bridge project, consisting of two spun pile points, experienced failure (exceeding the allowable inclination, indications of breakage at a depth of -8,000 mm, and failure to achieve the planned bearing capacity). The failure occurred after excavation for the pile cap was carried out.The additional load from preloading embankments and a spun pile stockyard, located 20,000 mm and 15,000 mm away, caused lateral deformation in the existing soil. This lateral deformation influenced additional deformation and bending moments in the failed spun piles. An evaluation of the additional load on the spun piles was conducted using the Finite Element Method with Plaxis 2D software. The additional load from the preloading embankments and stockyard was analyzed to determine its impact on the spun piles.The analysis showed that the additional load from the preloading embankments and stockyard caused lateral deformation, leading to deformation and bending moments in the spun piles. However, this additional load alone was not sufficient to cause failure in the spun piles.
Pendampingan Analisis Geoteknik Penanganan Lereng Pondok Pesantren Al Fitrah Metesah Tembalang Semarang Sadono, Kresno Wikan; Sari, Undayani Cita; Indrastono, Indrastono; Partono, Windu; Prastiwi, Yulita Arni; Pardoyo, Bambang
Darma Sabha Cendekia Vol 7 No 1 (2025): Darma Sabha Cendekia: Juni 2025
Publisher : Jurusan Ilmu Ekonomi dan Studi Pembangunan | Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32424/dsc.v7i1.6326

Abstract

Pada suatu pembangunan konstruksi diperlukan survey awal geoteknik sebagai penyelidikan geoteknik awal. Dengan adanya kegiatan ini maka permasalahan pembangunan dapat diketahui secara rill dilapangan. Pondok Pesantren (PP) Al-Fitrah merencanakan akan mendirikan bangunan baru berupa asrama santri. Bangunan ini direncanakan berada di Kecamatan Tembalang, Semarang. Oleh karena itu diperlukan survey awal dan penyelidikan geoteknik pada lokasi yang akan didirikannya bangunan baru berupa asrama santri Pondok Pesantren (PP) Al-Fitrah tersebut. Rencana bangunan asrama santri berada di atas lereng, sehingga perlu analisa terhadap longsoran. Penyelidikan geoteknik yang diperlukan adalah boring manual dan sondir (CPT) manual. Berdasarkan data pengujian tersebut, kemudian dapat dianalisis dan dievalusi kemudian diberikan rekomendasi dan saran yang sesuai untuk mendukung kelancaran pembangunan asrama santri baru Pondok Pesantren (PP) Al-Fitrah. Berdasarkan hal tersebut maka Tim Pengabdian kepada Masyarakat Departemen Teknik Sipil Universitas Diponegoro melaksanakan pengabdian masyarakat dalam bentuk evaluasi lokasi lahan rencana pembangunan asrama santri Pondok Pesantren (PP) Al-Fitrah. Dengan kegiatan ini diharapkan dapat memberikan saran dan masukan bagi pihak Yayasan Pondok Pesantren (PP) Al-Fitrah terhadap rencana pembangunannya
PERILAKU DEFORMASI BENDUNGAN JATIBARANG Kurniawan, Fajar Aldoko; S.P.R Wardani, S.P.R; Sadono, Kresno Wikan
Teras Jurnal : Jurnal Teknik Sipil Vol. 11 No. 2 (2021): Volume 11 Nomor 2, September 2021
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v11i2.592

Abstract

Abstrak Efek utama dari deformasi adalah hilangnya freeboard, kerusakan struktur bangunan pelengkap yang terletak di atas bendungan, retakan pada bendungan urugan (paling merugikan pada impervious core), terbentuknya suatu zona yang mengarah pada hidrolik fracturing, dan kegagalan instrumentasi. Bendungan Jatibarang merupakan bendungan urugan batu zonal inti tegak dengan inti clay. Tujuan dari penelitian ini adalah untuk menganalisis perilaku deformasi pada berbagai tahapan saat konstruksi, selama pengisian awal waduk dan pasca konstruksi (masa layan). Penelitian ini dilakukan dengan menggunakan data pembacaan instrumen pengukur deformasi dan evaluasi menggunakan kriteria penerimaan untuk menilai perilaku normal dan tidak normal. Hasil dari penelitian ini adalah selama konstruksi, deformasi vertikal Bendungan Jatibarang pada kedalaman antara 32 m sampai kedalaman 56 m berada di luar batas deformasi normal. Pergerakan deformasi horizontal pada pengisian awal dari Bendungan Jatibarang mempunyai nilai deformasi yang besar karena berada di atas perilaku umum deformasi horizontal pada beberapa bendungan. Pada kurun waktu konstruksi Bendungan Jatibarang 2014 hingga pembacaan terakhir pada tahun 2020 terlihat tidak terjadi perubahan yang signifikan namun pada kedalaman antara 20-30 m terjadi penurunan yang besar dibandingkan dengan lainnya yang mengindikasikan bahwa pada kedalaman tersebut terjadi konsentrasi penurunan internal yang besar Kata kunci: Bendungan Jatibarang, instrumentasi, deformasi, deformasi vertikal, deformasi horizontal  Abstract The main effects of deformation are loss of freeboard, damage to the auxiliary structure located above the dam, cracks in the embankment dam (impervious core), formation of a zone leading to hydraulic fracturing, and instrumentation failure. Jatibarang Dam is an upright core zonal rockfill dam with a clay core. The purpose of this study is to analyze the deformation behavior at various stages during construction, during the initial filling of the reservoir and post construction (post construction). This research was conducted using the reading data of the deformation instrumen and the evaluation using acceptance criteria to assess normal and abnormal behavior. The result of this research is that during construction, the vertical deformation at a depth between 32 m to 56 m is outside the normal deformation limit. The horizontal deformation at the initial filling of the Jatibarang Dam has a large deformation value because it is above the general horizontal deformation behavior of several dams. During the construction period 2014 until 2020 Jatibarang Dam did not appear to be any significant changes, but at a depth between 20-30 meters there was a large decrease compared to others indicating that at depth there was a large concentration of internal decline. Keywords: Jatibarang dam, instrumentation, deformation, vertical deformation, horizontal deformation
Pemanfaatan Abu Batu Hasil Proses Pemecah Batu Sebagai Material Pengganti Lapis Drainase Pada Pondasi Perkerasan Jalan Beton: A Systematic Literature Review Budilaksono, Obo Pulih; Bagus Hario Setiadji, Bagus Hario; Sadono, Kresno Wikan
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1182

Abstract

Abstrak Limbah Konstruksi dihasilkan adanya pembangunan infrastruktur yang memberikan dampak negatif terhadap lingkungan. Pesatnya pembangunan infrastruktur di Indonesia tentunya hal ini juga akan menghasilkan limbah konstruksi yang jumlahnya banyak dan cepat penambahannya. Sumber limbah konstruksi bisa dalam bentuk padat, cair, gas atau kombinasi dari semua bentuk tersebut. Proyek konstruksi merupakan penghasil limbah padat yang sangat besar. Manajemen pengelolaan dan pemanfaatan limbah konstruksi perlu dilaksanakan secara seksama, Indonesia merupakan negara berkembang yang laju pembangunan infrastrukturnya sangat pesat sekarang ini tetap mendukung pencapaian SDGs Agenda 2030, salah satu SDGs adalah Zero Waste Project dengan melaksanakan prinsip œThe 6 Rs of sustainability. Beberapa penelitian sebelumya terkait pemanfaatan abu batu digunakan sebagai penganti agregat halus campuran pembuat beton. Mengacu penelitiaan sebelumnya terkait pemanfaatan abu batu belum terdapat pemanfaatan abu batu digunakan sebagai material pengganti lapis drainase pada pondasi pekerasan jalan beton, sehingga masih terdapat gap pada penelitian sebelumnya yang akan dilakukan penelitian ini. Kata Kunci: Limbah Konstruksi, Abu Batu, Lapis Drainase, Perkerasan Beton  Abstract Construction waste is generated by infrastructure development that has a negative impact on the environment. The rapid development of infrastructure in Indonesia will certainly also produce construction waste in large quantities and increasing rapidly. Sources of construction waste can be in the form of solid, liquid, gas or a combination of all these forms. Construction projects are very large producers of solid waste. Management of construction waste management and utilization needs to be carried out carefully, Indonesia is a developing country with a very rapid rate of infrastructure development currently still supporting the achievement of the SDGs Agenda 2030, one of the SDGs is the Zero Waste Project by implementing the principle of "The 6 Rs of sustainability". Several previous studies related to the utilization of stone ash were used as a substitute for fine aggregate in concrete mixtures. Referring to previous studies related to the utilization of stone ash, there has been no use of stone ash as a substitute material for drainage layers on concrete road pavement foundations, so there is still a gap in previous research that will be carried out in this study. Keyword: Construction waste, Stone Ash, Drainage Layer, Concrete Pavement
Dynamics Responses of a Block Machine Foundation and a Pile Group Foundation Systems on Stratified Residual Soils in Indonesia by Lumped Mass and Finite Element Methods Susila, Endra; Ary, Wim Ramartsa; Sahadewa, Andhika; Putri, Karina Meilawati Eka; Zulkifli, Ediansjah; Sadono, Kresno Wikan
Journal of Engineering and Technological Sciences Vol. 56 No. 2 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.2.6

Abstract

This paper presents a comprehensive study of the dynamic responses of machine foundations, both block and pile foundations, on stratified residual soils in Duri and Ulubelu, Indonesia. The evaluation was conducted using two widely recognized methods: the lumped mass method (LMM) and the finite element method (FEM). LMM and FEM were performed by utilizing DYNA and ABAQUS, respectively. The analysis results showed that LMM generally predicted more conservative displacements compared to FEM. This conservatism in predicted displacement was more pronounced for pile group foundations, which are inherently more flexible than block foundations. Additionally, this study found that the resonance frequencies obtained through both analysis methods were not the same. Furthermore, this paper includes a parametric study and presents its results to assess the influence of key factors, i.e., pile cap thickness, pile diameter, number of piles, and vertical dynamic loads, on displacement.
Back Analysis dan Validasi Numerik-Manual Parameter Residual Soil: Studi Kasus Longsoran Bendungan Bagong Al Qorni, Muhammad Rizqi Uwais; Sadono, Kresno Wikan; Sukamta, Sukamta
Jurnal Talenta Sipil Vol 9, No 1 (2026): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v9i1.1292

Abstract

A landslide on the left abutment of the Bagong Dam on 14 August 2025 indicated a significant gap between the design parameters and the actual field conditions, particularly within the critical zone of weathered limestone and residual soil (RQD = 0–11%). This study aims to validate the geotechnical parameters of the dam abutment through back analysis of the actual landslide and to formulate safe slope geometry design recommendations. A comprehensive research methodology is employed, integrating geological characterization based on six boreholes, parametrized back analysis using ten reference materials with similar geological conditions, cross-method validation between the Limit Equilibrium method (manual Fellenius method) and the finite element method (PLAXIS LE), GSI–Hoek–Brown validation for weathered rock zones, and parameter sensitivity analysis. The results show that the validated parameters c = 35,5 kPa and φ = 23° represent the critical field conditions, yielding safety factors of FS = 1,173 (PLAXIS LE) and FS = 1,2588 (Fellenius method), with an inter-method deviation of 7,32%. Sensitivity analysis identifies the pore pressure ratio (Ru) as the dominant controlling factor (ΔFS/ΔRu = –0,155), explaining the failure mechanism during the rainy season. The optimal design recommendation is a stepped slope geometry with a single berm at elevation 320 m and a slope angle of 33°, resulting in FS = 1,629, which satisfies construction safety criteria (FS ≥ 1,35) and represents a 38,8% increase in stability compared with the existing condition.
The EFEKTIVITAS COUNTERWEIGHT DALAM MENGATASI REMBESAN DAN UPLIFT PADA BENDUNGAN SADAWARNA: EFEKTIVITAS COUNTERWEIGHT DALAM MENGATASI REMBESAN DAN UPLIFT PADA BENDUNGAN SADAWARNA Simanjuntak, Mario Antoni; Sriyana; Sadono, Kresno Wikan
Menara: Jurnal Teknik Sipil Vol. 21 No. 2 (2026): Menara : Jurnal Teknik Sipil
Publisher : Teknik Sipil, Fakultas Teknik Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jmenara.v21i2.62283

Abstract

Penelitian ini dilakukan pada Bendungan Sadawarna yang menunjukkan indikasi rembesan dan tekanan uplift pada tubuh bendungan, sehingga diperlukan tindakan mitigasi melalui pembangunan counterweight sebagai upaya perkuatan. Studi ini bertujuan untuk mengevaluasi efektivitas counterweight dalam menurunkan debit rembesan dan meningkatkan stabilitas bendungan. Metode analisis yang digunakan meliputi evaluasi rembesan berdasarkan metode ambang batas, Seepage index, serta pemodelan numerik menggunakan SLOPE/W untuk mengkaji respons hidraulik dan stabilitas lereng setelah pemasangan counterweight. Hasil evaluasi menunjukkan bahwa debit rembesan pada kondisi Elevasi Muka Air Maksimum (+84,00 m) berada jauh di bawah batas yang dipersyaratkan, yaitu 0,0015 liter/menit/meter dibandingkan nilai ambang 0,28 liter/menit/meter. Berdasarkan metode Seepage Index, nilai rembesan sebelum pemasangan counterweight adalah 1,3482 (>1), yang mengindikasikan potensi rembesan berlebih, sedangkan setelah pemasangan nilai turun menjadi 0,3391 (<1), menunjukkan kondisi aman. Hasil pemodelan SLOPE/W menguatkan bahwa perkuatan counterweight memberikan peningkatan signifikan pada stabilitas tubuh bendungan. Secara keseluruhan, penelitian ini menyimpulkan bahwa pemasangan counterweight efektif dalam mengendalikan rembesan, mengurangi risiko uplift, dan meningkatkan tingkat keamanan Bendungan Sadawarna.