Alternatif Penanganan Masalah Stabilitas Tanah pada Lereng Galian Proyek Jalan Tol Padang - Sicincin

Herlambang, Tomy (2025) Alternatif Penanganan Masalah Stabilitas Tanah pada Lereng Galian Proyek Jalan Tol Padang - Sicincin. Masters thesis, IInstitut Teknologi Sepuluh Nopember.

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Abstract

Proyek Jalan Tol Padang – Sicincin merupakan bagian dari koridor pendukung Jalan Tol Trans Sumatera dengan kondisi pada STA 26+825 – 27+400 dan STA 28+900 berupa galian dengan ketinggain ±18 meter dan ±21 meter. Kondisi lapangan tidak memungkinkan digunakan kemiringan ideal, sehingga perlu perkuatan menggunakan soil nailing. Pada beberapa lokasi mengalami retak lereng dan menyebabkan permasalahan baru, sehingga diperlukan alternatif penanganan yang sesuai. Analisis yang dilakukan berupa analisis penyebab retakan, analisis stabilitas lereng, dan penentuan solusi permasalahan di lapangan. Analisis stabilitas lereng dilakukan pada empat lokasi dengan kondisi konvensional tanpa retak dan kondisi retak dengan menggunakan software Slope/W. Analisis penyebab retak dilakukan dengan studi literatur serta observasi lapangan. Solusi permasalahan akan didasarkan pada hasil analisis stabilitas lereng dan analisis penyebab retak. Hasil analisis menunjukkan kondisi retak merupakan kondisi paling kritis dengan safety factor pada STA 26+925, 27+000, 28+900 dan 28+950 adalah 0.746, 0.710, 1.394 dan 0.985 dibanding kondisi konvensional dengan safety factor pada lokasi yang sama sebesar 1.078, 1.062, 1.81 dan 1.408. Retak yang terjadi disebabkan karena adanya hujan yang menyebabkan lepasnya butiran tanah, jenis tanah yang rawan erosi dan tidak adanya vegetasi penutup. Alternatif solusi yang digunakan adalah penggunaan saluran pengalih berbentuk trapezium dengan lebar bawah 50 cm dan tinggi 100 cm kemiringan 1:1 untuk sisi atas lereng dan saluran persegi dengan lebar bawah 0.7 meter tinggi 0.35 meter untuk area berm. Angkur digunakan untuk meningkatkan stabilitas lereng pada STA 26+925 dan 27+000 dengan jumlah angkur yang digunakan sebanyak 2 buah dengan bond length 8 meter, free length 15.5 meter, jarak antar angkur 2.5 meter dengan gaya prategang 300 kN untuk STA 25+925 dan jumlah angkur 2 buah, bond length 7 meter, free length 8.5 meter, jara angkur 2.5 meter dengan gaya prategang 250 kN untuk STA 27+000. Geosintetik diperlukan untuk membuat lapisan kedap air pada lereng dan penggunaan sumur drainase untuk menurunkan muka air tanah. Dapat ditarik kesimpulan bahwa lereng galian tidak stabil pada kondisi retak, dengan penyebab retak diakibatkan oleh erosivitas material pengikis, erodibilitas tanah dan material penutup. Alternatif penanganan erosi yang digunakan adalah dengan saluran pengalih, angkur, geosintetik dan sumur drainase.
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The Padang–Sicincin Toll Road Project is part of the supporting corridor of the Trans-Sumatra Toll Road, with cut sections at STA 26+825 – 27+400 and STA 28+900 having heights of approximately ±18 meters and ±21 meters. Due to site conditions, ideal slope angles could not be applied, thus requiring reinforcement using soil nailing. In several locations, cracks appeared on the slopes, creating new issues that require appropriate alternative solutions. The conducted analyses include crack cause analysis, slope stability analysis, and determination of field-based solutions. Slope stability was analyzed at four different locations under conventional (uncracked) and cracked conditions using Slope/W software. The crack cause analysis was conducted through literature review and field observations. The proposed solutions are based on the results of slope stability and crack cause analysis. The analysis results show that cracked conditions are the most critical, with safety factors at STA 26+925, 27+000, 28+900, and 28+950 being 0.746, 0.710, 1.394, and 0.985, respectively, compared to conventional conditions with safety factors at the same locations of 1.078, 1.062, 1.81, and 1.408. The cracks are caused by rainfall leading to the detachment of soil particles, erosion-prone soil types, and the absence of vegetation cover. The proposed alternative solutions include the use of trapezoidal diversion channels with a bottom width of 50 cm and height of 100 cm with a 1:1 slope on the upper side of the slope, and rectangular channels with a bottom width of 0.7 meters and height of 0.35 meters for the berm area. Anchors are used to improve slope stability at STA 26+925 and 27+000, with two anchors each. For STA 26+925, the anchors have a bond length of 8 meters, a free length of 15.5 meters, a spacing of 2.5 meters, and a prestressing force of 300 kN. For STA 27+000, the anchors have a bond length of 7 meters, a free length of 8.5 meters, a spacing of 2.5 meters, and a prestressing force of 250 kN. Geosynthetics are needed to create a waterproof layer on the slope, and drainage wells are used to lower the groundwater level. It can be concluded that the cut slopes are unstable under cracked conditions, with the cracks caused by erosive materials, soil erodibility, and lack of cover material. The erosion control alternatives used include diversion channels, anchors, geosynthetics, and drainage wells.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Stabilitas lereng, Slope/W, Erosi, Angkur, Saluran pengalih
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction)
Divisions:	Faculty of Civil Engineering and Planning > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Tomy Herlambang
Date Deposited:	05 Aug 2025 04:34
Last Modified:	05 Aug 2025 04:34
URI:	http://repository.its.ac.id/id/eprint/125686

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