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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Civil Engineering Journal JMTS: Jurnal Mitra Teknik Sipil Journal of Engineering and Technological Sciences
Andhika Sahadewa, Andhika
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung.
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering

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Shear Behavior of Random Rockfill in Dam Construction via Large-Scale In-Situ Testing Sahadewa, Andhika; Hakim, Abi M.; Setyawan, Haris E.; Kamaruddin, Samira A.; Krisnanto, Sugeng
Civil Engineering Journal Vol. 11 No. 6 (2025): June
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-06-03

Abstract

Dam construction commonly demands a massive amount of random material. This material offers practical material collection, minimum environmental impact, and economical cost. Unfortunately, shear strength assessment of random material is difficult because of large particle presence. Regular laboratory tests cannot accommodate these large particles. Misevaluation of random material shear strength may induce disastrous collapse. A large-scale direct shear apparatus, with a 70 cm by 70 cm shear plane, was developed and proposed for testing random fill material in-situ. This manuscript presents an experimental study using this device in Rukoh Dam construction, Indonesia. Test results captured variations between normal stress and shear stress to determine shear strength parameter models. Volume changes during shearing were also observed. Random materials in Rukoh Dam could be categorized as random rock. This study was also compared to other relevant rockfill studies. The proposed method offers an impressive approach for assessing and verifying the shear strength of compacted random material as well as compaction quality on site. It can be used to decide if the ongoing design and compaction method have to be modified or continued. Since the proposed direct shear test is reliable, fast, simple, and inexpensive, it is strongly recommended for dam construction.
Perkembangan Uji Geser Langsung Skala Ukuran Besar untuk Material Acak Bendungan di Indonesia Sahadewa, Andhika
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 31, Nomor 1, JULI 2025
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v31i1.69081

Abstract

Dams offer various benefits to life. In the last decade, Indonesia built above 50 dams. These dams majorly are built from geomaterial fill, including random materials. Random materials are very economical and have a low environmental bad impact, so their use tends to be maximized. Zones of random material often affect dam stability. Unfortunately, the evaluation of random material shear strength, a crucial parameter for dam stability analysis, is challenging. The large particles in random materials become an obstacle in shear strength tests using regular size apparatus. In Indonesia, there are several large-scale direct shear test facilities in laboratory and field to reliably test random material shear strength. Each laboratory test facility is owned by Technical Implementation Unit for Hydraulics and Water Geotechnics, PT. Indra Karya (Persero), and River Basin Organization for Bengawan Solo. The field test facility, called ILSDS, was devised by the Indonesian Geotechnical Inztitute in cooperation with Institut Teknologi Bandung and Universiti Teknologi Malaysia. This paper introduces these facilities and presents the results of ILSDS tests on random materials in Rukoh Dam, Aceh. The test results showed variability in shear strength as well as a unique behavior in the stress- strain relationship related to the random material content itself, such as large-grain rich or fine-grain rich materials. This large-scale testing is cost-effective, simple, and reliable. It is greatly recommended as a regular practice in a dam construction.
ANALISIS PERKUATAN SOIL NAILING PADA LERENG SUNGAI CILIWUNG DI AREA LAPANGAN TEMBAK KOPASSUS CIJANTUNG Hakim, Abi Maulana; Rifan, Muhammad; Sahadewa, Andhika
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 3, Agustus 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i3.32627

Abstract

This study analyses the slope stability of Ciliwung Riverside in the Kopassus shooting range area, where signs of landslides occurred i.e. broken fence and road pavement on top of the slope. The purpose of this research is to evaluate the slope's safety factor (SF) before and after reinforcement with soil nailing, as well as to examine the effect of variations in length, spacing, and soil nailing’s diameter on the slope's SF. The stability analysis is conducted using the limit equilibrium method through a computer program The slope's SF before reinforcement was 1.16 ≤ 1,5, indicating the need for additional reinforcement. Out of 125 soil nailing variations tested, 61 variations achieved a static SF ≥ 1,5 (ranging from 1,50 to 1,67) and an earthquake SF ≥ 1,1 (ranging from 1,17 to 1,29). The results showed that increasing the borehole diameter and nail length increases the SF, while increasing the nail spacing decreases the SF. The optimal combination was obtained at spacing of 2 meters, nail length of 11 meters, and diameter of 175 mm, resulting in a total nail length of 39 m/m and grout volume of 0,93 m³/m, with a static SF of 1,54 and an earthquake SF of 1,19. Abstrak Penelitian ini menganalisis stabilitas lereng di area lapangan tembak Kopassus, yang mengalami indikasi kelongsoran berupa kerusakan pagar dan jalan aspal di atas kepala lereng. Tujuan penelitian ini adalah untuk mengevaluasi safety factor (SF) lereng sebelum dan setelah diperkuat dengan soil nailing, dan mengkaji pengaruh variasi panjang, jarak spasi, serta diameter soil nailing terhadap nilai SF lereng. Analisis stabilitas dilakukan dengan menggunakan metode limit equilibrium melalui program komputer. Dari analisis didapatkan bahwa SF lereng sebelum perkuatan adalah 1,16 ≤ 1,5. Kondisi ini menunjukkan bahwa lereng memerlukan perkuatan tambahan. Dari 125 variasi soil nailing yang diuji, 61 variasi memiliki SF statik ≥ 1,5 (antara 1,50 hingga 1,67) dan SF gempa ≥ 1,1 (antara 1,17 hingga 1,29). Hasil penelitian menunjukkan bahwa semakin besar diameter lubang bor dan semakin panjang nail, maka SF lereng meningkat. Sedangkan semakin besar jarak spasi menyebabkan SF menurun. Kondisi optimal didapatkan pada spasi nail 2 m, panjang nail 11 m, dan diameter nail 175 mm dengan SF statik 1,54 dan SF gempa 1,19. Total panjang nail yang dibutuhkan sebesar 39 m/m volume grout 0,93 m3/m.
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.
Co-Authors Ary, Wim Ramartsa Endra Susila Hakim, Abi M. Hakim, Abi Maulana Kamaruddin, Samira A. Kresno Wikan Sadono Putri, Karina Meilawati Eka Rifan, Muhammad Setyawan, Haris E. Sugeng Krisnanto Zulkifli, Ediansjah