Alternatif Desain Perkuatan Tanah Dasar Pada Oprit dan Underpass Sta 15+925-16+425 Proyek Pembangunan Jalan Tol PROBOWANGI Paket 2

Permana, Ardanu (2026) Alternatif Desain Perkuatan Tanah Dasar Pada Oprit dan Underpass Sta 15+925-16+425 Proyek Pembangunan Jalan Tol PROBOWANGI Paket 2. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proyek Jalan Tol Probolinggo-Banyuwangi (PROBOWANGI) merupakan bagian dari proyek strategis nasional yang bertujuan meningkatkan konektivitas di wilayah Jawa timur. Total panjang Tol ini membentang 175,78 km. Pada tahap proyek ini dibagi menjadi tiga paket pekerjaan konstruksi. Paket 1: Gending-Kraksaan (12,88 km), Paket 2: Kraksaan-Paiton (11,2 km), Paket 3: Paiton-Besuki (25,6 km). Jalan tol paket 2 ini dari STA 00+000 – 20+200. Namun, pada segmen STA 15+925 – 16+425 di Paket 2, ditemukan permasalahan tanah dasar yang didominasi oleh tanah lempung lunak dengan nilai Standart Penetration Test (SPT) rendah (4-10). Hal ini berpotensi menyebabkan penurunan dan deformasi berlebihan pada struktur underpass dan oprit yang akan dibangun. Perlu metode perbaikan tanah yang dianalisis dalam Alternatif desain ini yaitu metode mini pile, PVD, geotekstil. Mini pile digunakan untuk menyalurkan beban struktur ke lapisan tanah yang lebih kuat, PVD (Prefabricated Vertical Drain) digunakan untuk mempercepat waktu pemampatan pada tanah dasar, sementara geotekstil berfungsi sebagai lapisan perkuatan guna meningkatkan stabilitas timbunan dan mengurangi deformasi. Penelitian melibatkan studi literatur, pengumpulan data lapangan, analisis parameter tanah, serta perhitungan stabilitas lereng menggunakan perangkat lunak geostudio. Evaluasi stabilitas lereng dilakukan untuk menilai faktor keamanan sebelum dan setelah penerapan metode perbaikan tanah. Berdasarkan analisa masing-masing alternatif desain yang telah dilakukan, dapat disimpulkan bahwa metode perkuatan tanah dasar dengan mini pile pada underpass, dengan lebar mini pile 0,25 x 0,25 m, kedalaman 16 m, jarak pemasangan antar pile 1,28 m, dan jumlah 115 buah pile. Dari data tersebut mini pile mampu menahan beban dari underpass sehingga didapatkan penurunan sebesar 3,84 cm. PVD pola segitiga dengan diameter 1,05 m, jarak PVD 1 m, kedalaman 16 m. Dari data tersebut didapat waktu percepatan konsolidasi selama 14 minggu, dan pemasangan geotekstil pada lereng oprit dengan kuat tarik 600 kn, jarak pemasangan 1 m, jumlah total yang dibutuhkan terdapat 9 lapis geotextil. Dari spesifikasi tersebut didapat SF sebesar 1,6.
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The Probolinggo-Banyuwangi Toll Road (Probowangi) project is part of a national strategic project aimed at improving connectivity in the East Java region. The total length of the Probowangi Toll Road is 175.78 km. This phase of the project is divided into three construction packages. Package 1: Gending-Kraksaan (12.88 km), Package 2: KraksaanPaiton (11.2 km), Package 3: Paiton-Besuki (25.6 km). Package 2 of the toll road is from STA 00+000 – 20+200. However, the Probowangi Toll Road Project in the STA 15+925 – 16+425 segment in Package 2 has encountered problems with the subgrade, which is dominated by soft clay with a low Standard Penetration Test (SPT) value (4-10). This has the potential to cause excessive settlement and deformation of the underpass and ramp structures to be built. This alternative design aims to evaluate soil reinforcement methods that are useful for improving the stability of the approach and underpass structures. Soil improvement methods need to be analyzed in this design alternative. These are the mini pile, PVD, and geotextile methods. Mini piles are used to transfer structural loads to stronger soil layers, PVD (Prefabricated Vertical Drain) is used to accelerate the compaction time of the subgrade, while geotextiles serve as a reinforcement layer to improve embankment stability and reduce deformation The research involved literature studies, field data collection, soil parameter analysis, and slope stability calculations using Geostudio software. Slope stability evaluations were conducted to assess safety factors before and after the application of soil improvement methods. The analysis results showed that geotextiles significantly improved the stability of the ramp slope, with an increase in the safety factor that met construction safety standards. Based on the analysis of each design alternative that has been carried out, it can be concluded that the method of strengthening the subgrade with mini piles in the underpass, with a mini pile width of 0.25 x 0.25 m, a depth of 16 m, a distance between piles of 1,28 m, and a total of 115 piles. From this data, the mini piles are able to withstand the load from the underpass, resulting in a settlement of 3,84 cm. PVD with a triangular pattern, diameter of 1,05 m, PVD spacing of 1 m, and depth of 16 m. From this data, the consolidation acceleration time was 14 weeks, and geotextile installation on the ramp slope with a tensile strength of 600 kN, installation spacing of 1 m, and a total of 9 layers of geotextile required. From this data, the SF was 1,6.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Geotextile, mini pile, PVD, stabilitas tanah, tanah lunak, Geotextile, mini pile, oprite, PVD, soil stability, soft soil, underpass
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations.
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Ardanu Dwi Permana
Date Deposited:	03 Feb 2026 03:12
Last Modified:	03 Feb 2026 03:12
URI:	http://repository.its.ac.id/id/eprint/131739

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