Santoso, Rully Finaliyah (2026) Evaluasi Efektivitas Konfigurasi Soil Nailing Terhadap Stabilitas Lereng Sebagai Alternatif Perkuatan Lereng Pada Galian Dalam, Studi Kasus Jalan Tol Lingkar Pekanbaru Sta 205+575. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini bertujuan untuk mengevaluasi efektivitas konfigurasi soil nailing sebagai metode perkuatan galian dalam yang sering digunakan untuk meningkatkan stabilitas lereng galian dalam pada tanah kohesif . Pada Jalan Tol Ruas Rengat–Pekanbaru Seksi Lingkar Pekanbaru STA 205+575 memiliki kondisi tanah kohesif dengan plastisitas rendah – sedang dan konsistensi tanah teguh sampai kaku. Penelitian dilatarbelakangi oleh kebutuhan penyesuaian desain lereng akibat penambahan frontage road dan keterbatasan right of way (ROW), sehingga lereng direncanakan dengan kemiringan 2V:1H yang lebih curam dan memerlukan sistem perkuatan. Analisis dilakukan dengan memvariasikan panjang nail sebesar 15 m, 17 m, dan 19 m serta sudut pemasangan 10°, 20°, dan 30°. Evaluasi faktor keamanan lereng (SF) dilakukan pada kondisi masa konstruksi, masa layan jangka panjang, dan kondisi gempa. Hasil penelitian menunjukkan bahwa lereng tanpa perkuatan tidak memenuhi kriteria stabilitas pada kondisi jangka panjang, sedangkan pada masa konstruksi dan kondisi gempa masih memenuhi persyaratan. Seluruh konfigurasi soil nailing yang dianalisis mampu meningkatkan nilai SF sehingga memenuhi kriteria stabilitas pada ketiga kondisi pembebanan. Peningkatan stabilitas terbesar diperoleh pada panjang nail 19 m dengan efektivitas peningkatan SF sebesar 50,20%–67,32%, sedangkan sudut pemasangan 30° memberikan peningkatan efektivitas tertinggi dibandingkan sudut 20° dan 10°. Berdasarkan pertimbangan teknis dan biaya pelaksanaan, konfigurasi soil nailing dengan panjang nail 15 m dan sudut pemasangan 30° merupakan alternatif yang paling efektif dan efisien untuk diterapkan pada lereng galian STA 205+575.
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This study aims to evaluate the effectiveness of soil nailing as a reinforcement method for deep excavations, which is widely used to improve the stability of deep excavation slopes in cohesive soils. The study was conducted at STA 205+575 of the Rengat–Pekanbaru Toll Road, Pekanbaru Ring Road Section, where the subsurface consists of cohesive soils with low to medium plasticity and firm to stiff consistency. The study was motivated by the need to modify the original slope design due to the construction of a frontage road and the limited right of way (ROW), requiring a steeper slope inclination of 2V:1H and the implementation of a slope reinforcement system. The analysis was conducted by varying the nail lengths to 15 m, 17 m, and 19 m, with installation angles of 10°, 20°, and 30°. The slope stability was evaluated using the Safety Factor (SF) under three loading conditions: the construction stage, long-term service condition, and seismic condition. The results indicate that the unreinforced slope failed to satisfy the required stability criteria under long-term service conditions, although it met the requirements during the construction stage and under seismic loading. All soil nailing configurations significantly improved the Safety Factor and satisfied the stability requirements for all loading conditions. The highest improvement in slope stability was achieved with a 19 m nail length, resulting in an SF increase ranging from 50.20% to 67.32%, while the 30° installation angle provided the greatest effectiveness compared with the 20° and 10° installation angles. However, considering both technical performance and construction cost, the soil nailing configuration with a 15 m nail length and a 30° installation angle was identified as the most effective and economical alternative for reinforcing the excavation slope at STA 205+575.
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