Perencanaan Perkuatan Lereng Timbunan Jalan dan Sistem Manajemen Air Hujan pada Kelongsoran Lereng Studi Kasus: Interchange Sidoarjo STA 0+025 – STA 0+125

Salsabila, Rahima Ugga (2026) Perencanaan Perkuatan Lereng Timbunan Jalan dan Sistem Manajemen Air Hujan pada Kelongsoran Lereng Studi Kasus: Interchange Sidoarjo STA 0+025 – STA 0+125. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Interchange Sidoarjo pada Jalan Tol Surabaya-Gempol di Kabupaten Sidoarjo mengalami kelongsoran timbunan pada STA 0+025 hingga STA 0+125 yang berpotensi membahayakan keselamatan pengguna jalan. Penelitian ini bertujuan mengidentifikasi penyebab kelongsoran, mengevaluasi stabilitas lereng pada kondisi eksisting, serta merencanakan alternatif perkuatan lereng dan sistem manajemen air hujan. Analisis stabilitas lereng menunjukkan nilai safety factor lebih kecil dari 1,2. Kondisi ini sesuai dengan temuan lapangan berupa kelongsoran internal yang ditandai penurunan elevasi tanah sebesar ± 30 cm dan adanya pohon miring yang menandakan pergerakan tanah. Pada lokasi studi terdapat drainase dengan ukuran 50 × 80 cm di bawah timbunan sisi luar, sedangkan bagian atas timbunan belum dilengkapi saluran, sehingga aliran air hujan langsung menuju lereng dan berpotensi menimbulkan erosi serta menurunkan stabilitas lereng. Keberadaan kantong air pada kedalaman yang relatif dalam tidak berpengaruh signifikan terhadap kelongsoran, sementara sistem manajemen air hujan di area dalam interchange belum berfungsi optimal dan sering menimbulkan genangan walaupun sudah terdapat culvert inlet dengan diameter 80 cm. Hasil pengujian tanah menunjukkan lapisan timbunan sirtu pada kedalaman 0-8 meter memiliki konsistensi very dense dengan daya dukung yang baik. Oleh karena itu, kelongsoran tidak disebabkan oleh kelemahan material timbunan, melainkan oleh terbentuknya retakan lokal (crack soil) dan kurangnya manajemen air hujan. Sebagai upaya penanganan, direncanakan perkuatan lereng menggunakan cerucuk serta perencanaan sistem drainase permukaan. Hasil perhitungan menunjukkan bahwa pada timbunan bagian kiri dan kanan masing-masing diperlukan 3 buah cerucuk dengan panjang 4 meter. Sistem drainase direncanakan menggunakan U-Ditch 400 × 500 pada bagian atas timbunan dan U-Ditch 800 × 1000 pada bagian bawah timbunan di dalam interchange. Pada bagian luar interchange telah tersedia saluran eksisting pasangan batu kali 500 × 800, namun kapasitasnya belum mencukupi. Drainase vertikal direncanakan menggunakan cor in situ dengan ukuran 400 × 400 dengan tambahan stepped setiap 30 cm. Berdasarkan analisis biaya, alternatif penanganan berupa sistem manajemen air hujan tanpa gabion memiliki biaya paling ekonomis dengan total sebesar Rp 641.595.633,52, sehingga dipilih sebagai solusi yang paling efisien dalam penanganan kelongsoran di Interchange Sidoarjo.
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The Sidoarjo Interchange on the Surabaya-Gempol Toll Road in Sidoarjo Regency experienced embankment slope failure from STA 0+025 to STA 0+125, which potientially endangered road user safety. This study aimed to identify the cause of the slope failure, evaluate the slope stability under existing conditions, and plan slope reinforcement alternatives along with a rainwater management system. Slope stability analysis revealed a safety factor (SF) value of less than 1,2. This cobdition aligns with field findings of internal slope movement, indicated by ground subsidence of approximately ±30 cm and the presence of tilted trees signifying soil displacement. The study location featured a 50 × 80 cm drainage channel beneath the outer side of the embankment, while the upper part of the embankment lacked channels, causing rainwater to flow directly down the slope, potentially leading to erosion and reduced stability. The presence of water pockets at relatively great depths did not significantly influence the failure, whereas the rainwater management system whitin the interchange area was not functioning optimally and often caused ponding despite the existence of an 80 cm diameter culvert inlet. Soil test results showed the sand-gravel embankment layer at a depth of 0-8 meters had a very dense consistency with good bearing capacity. Therefore, the slope failure was not caused by weak embankment material but by the formation of localized cracks (cracked soil) and inadequate rainwater management. As a mitigation measure, slope reinforcement using micropiles and a surface drainage system were planned. Calculation results indicated that the left and right sections of the embankment each required 3 micropiles with a length of 4 meters. The drainage system was designed using 400 × 500 U-Ditch channels at the top and 800 × 1000 U-Ditch channels at the bottom of the embankment whitin the interchange. An existing 500 × 800 stone masonry channel is available outside the interchange, but it’s capacity is insufficient. Vertical drainage is planned using in-situ concrete with dimensions of 400 × 400, incorporating a stepped section every 30 cm in height. Based on cost analysis, the alternative solution of a rainwater management system without gabion is the most economical option, with a total cost Rp 641.595.633,52. Therefore, it is selected as the most efficient solution for addressing the landslide at the Sidoarjo Interchange.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Cerucuk, Drainase, Gabion, Geolistrik, Kantong Air, Kelongsoran, Timbunan, Drainage, Embankment, Gabion, Geoelectrical, Micropile, Slope Failure, Water Pocket
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TA Engineering (General). Civil engineering (General) > TA780 Piles and pile-driving T Technology > TE Highway engineering. Roads and pavements > TE215 Drainage
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Rahima Ugga Salsabila
Date Deposited:	26 Jan 2026 04:14
Last Modified:	26 Jan 2026 04:14
URI:	http://repository.its.ac.id/id/eprint/130331

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