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All Journal Jurnal Indonesia Sosial Teknologi Acta Geoscience, Energy, and Mining
Triatmojo, Doni
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Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Social Sciences

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Analisis kualitas massa batuan terowongan menggunakan metode Rock Mass Rating (RMR) di daerah Kecamatan Sibiru-Biru, Kabupaten Deli Serdang Provinsi Sumatera Utara Wahyudie, Ridha; Setiawan*, Bambang; Nugraha, Gartika Setiya; Rifqan, Rifqan; Yunita, Halida; Triatmojo, Doni
Acta Geoscience, Energy, and Mining Vol 3, No 3 (2024): September 2024
Publisher : Departemen Teknik Kebumian Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/actaGEM.v3i3.36735

Abstract

Terowongan pengelak merupakan strukur bawah tanah yang berfungsi sebagai pengalihan aliran sungai selama pelaksanaan konstruksi bendungan. Konstruksi Bendungan Lau Simeme dengan terowongan pengelak dilakukan di Desa Kuala Dekah, Kecamatan Sibiru-biru, Kabupaten Deli Serdang, Provinsi Sumatera Utara. Pembuatan terowongan berkaitan erat dengan kondisi dan macam batuan, bidang diskontinuitas batuan, orientasi diskontinuitas batuan, serta air tanah. Oleh karena itu perlu dilakukan analisis kualitas massa batuan menggunakan metode Rock Mass Rating (RMR) untuk mengetahui sifat-sifat mekanika batuan dan kelas massa batuan pada Terowongan Pengelak Bendungan Lau Simeme. Penelitian ini akan dilakukan dengan melakukan pembobotan dan pengklasifikasian terowongan menggunakan metode Rock Mass Rating (RMR). Geomorfologi daerah penelitian terdiri dari atas satuan geomorfologi perbukitan rendah dan satuan geomorfologi perbukitan. Tatanan geologi daerah penelitian satuan batuan konglomerat, satuan batuan tufa pasiran, satuan batuan tufa karbonatan, satuan batuan tufa breksi. Hasil analisis kualitas massa batuan di daerah penelitian dengan menggunakam metode Rock Mass Rating (RMR) dari 18 section, 14 diantaranya menunjukkan kualitas fair rock (kelas batuan nomor III) dan 4 diantaranya menunjukkan kualitas good rock (kelas batuan nomor II) dengan rata-rata stand-up time 48 jam 5000 jam.
Risk Factor Analysis on Contingency Costs of Phase I Wastewater Network Project in Bogor City Triatmojo, Doni; Pratiwi Adi, Henny; Poedjiastoeti, Hermin
Jurnal Indonesia Sosial Teknologi Vol. 6 No. 2 (2025): Jurnal Indonesia Sosial Teknologi
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jist.v6i2.8856

Abstract

Contingency cost estimation is essential for construction project management to anticipate cost uncertainty due to various risks. This study analyzes risk-based contingency cost estimation in the Bogor City Phase I wastewater network system project. The background of this research is based on the need for accurate cost planning to avoid budget overruns and ensure project sustainability. The study aims to identify risk factors that affect contingency costs, group risks based on their degree of influence, and build a more accurate estimation model using the Partial Least Squares-Structural Equation Modeling (PLS-SEM) approach. This study uses a mixed method, namely qualitative analysis through interviews and literature studies to identify risk factors and a quantitative approach by distributing questionnaires to project stakeholders. The data was analyzed using SPSS 25 and SmartPLS software to test the validity and reliability of the contingency cost estimation model. The study results show that the most significant risk in the pre-construction stage is licensing and design, while in the construction stage is procuring equipment/materials and force majeure factors. The highest contingency cost estimate is in the preconstruction stage, with a value of 11.02%. The study's conclusion confirms that risk mitigation in the early stages of the project is essential to reduce the impact of budget uncertainty. The implications of this study contribute to the management of construction projects by providing a more accurate risk-based contingency cost estimation model that can be used as a reference for stakeholders in planning and managing infrastructure projects.
Co-Authors Gartika Setiya Nugraha Halida Yunita Hermin Poedjiastoeti Pratiwi Adi, Henny Rifqan, Rifqan Setiawan*, Bambang Wahyudie, Ridha