Analisis Perencanaan Eksisting dan Alternatif Perencanaan Penanganan Longsoran Studi Kasus Penanganan Longsoran Jalan Batas Kabupaten Karo – Panji STA 26+000

Siagian, Edward Piter (2026) Analisis Perencanaan Eksisting dan Alternatif Perencanaan Penanganan Longsoran Studi Kasus Penanganan Longsoran Jalan Batas Kabupaten Karo – Panji STA 26+000. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Stabilitas lereng di sepanjang infrastruktur jalan nasional sangat dipengaruhi oleh karakteristik tanah dasar serta intensitas curah hujan yang tinggi. Salah satu lokasi dengan tingkat kerawanan longsor yang tinggi berada pada ruas Jalan Nasional Batas Kabupaten Karo–Panji STA 26+000 di Kabupaten Dairi, Provinsi Sumatera Utara. Lokasi ini mengalami kejadian longsor pada 26 Januari 2024, dimana intensitas curah hujan harian mencapai kategori sangat lebat berdasarkan klasifikasi BMKG. Perencanaan penanganan longsoran eksisting berupa dinding penahan tanah (DPT) tipe cantilever wall dengan shear key, namun belum dilaksanakan. Penelitian ini bertujuan untuk menganalisis kembali kondisi stabilitas lereng eksisting dan perencanaan eksisting penanganan longsoran; disamping itu, direncanakan alternatif penanganan longsoran yang lebih aman dan efisien. Analisis stabilitas lereng dilakukan dengan pendekatan konvensional dan pendekatan fenomena cracked soil untuk merepresentasikan kondisi retakan akibat infiltrasi air hujan, serta mengevaluasi pengaruh curah hujan terhadap nilai faktor keamanan (factor of safety). Hasil analisis menunjukkan bahwa kondisi lereng eksisting memiliki SF sebesar 1,89 (kondisi kritis), dan menurun menjadi 0,67 dengan pendekatan cracked soil yang merepresentasikan terjadinya longsor. Perencanaan eksisting DPT cantilever wall dengan shear key menghasilkan SF geser sebesar 0,89 (tidak aman), SF ambles sebesar 2,07, dan overall stability sebesar 1,98. Alternatif penanganan pertama berupa DPT cantilever wall yang diperkuat dengan bored pile memberikan peningkatan signifikan terhadap SF geser 2,11, SF ambles 5,03, dan overall stability 4,40. Alternatif kedua berupa timbunan diperkuat dengan geotekstil dan bronjong menghasilkan SF geser 5,17, SF ambles 5,80, dan overall stability 2,22 dengan syarat adanya sistem drainase yang memadai. Berdasarkan aspek teknis, waktu pelaksanaan, dan efisiensi biaya, alternatif geotekstil diperkuat bronjong dinilai sebagai solusi penanganan longsoran yang paling aman dan efisien untuk lokasi penelitian ini.
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Slope stability along national road infrastructure is strongly influenced by subsoil characteristics and high rainfall intensity. One location with a high level of landslide susceptibility is located on the National Road section at the Karo Regency Border–Panji STA 26+000 in Dairi Regency, North Sumatra Province. This site experienced a landslide event on January 26, 2024, when the daily rainfall intensity reached the very heavy category based on BMKG classification. The existing landslide mitigation plan consists of a cantilever-type retaining wall with a shear key; however, this plan has not yet been implemented. This study aims to re-evaluate the existing slope stability conditions and the current landslide mitigation design, as well as to propose alternative mitigation measures that are safer and more efficient. Slope stability analysis was conducted using both a conventional approach and a cracked soil phenomenon approach to represent crack conditions caused by rainfall infiltration, and to evaluate the effect of rainfall on the factor of safety (FS). The analysis results show that the existing slope condition has an FS of 1.89 (critical condition), which decreases to 0.67 when the cracked soil approach is applied, representing the occurrence of a landslide. The existing design of a cantilever retaining wall with a shear key yields a sliding safety factor of 0.89 (unsafe), a bearing capacity safety factor of 2.07, and an overall stability factor of 1.98. The first alternative mitigation measure, consisting of a cantilever retaining wall reinforced with bored piles, provides a significant improvement, with a sliding safety factor of 2.11, a bearing capacity safety factor of 5.03, and an overall stability factor of 4.40. The second alternative, consisting of reinforced embankment using geotextiles and gabions, results in a sliding safety factor of 5.17, a bearing capacity safety factor of 5.80, and an overall stability factor of 2.22, provided that an adequate subdrainage system is installed. Based on technical aspects, construction duration, and cost efficiency, the geotextile-reinforced gabion alternative is considered the safest and most efficient landslide mitigation solution for the study area.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	bored pile, bronjong, DPT cantilever, fenomena cracked soil, geotekstil, stabilitas lereng, subdrain. bored pile, cracked soil phenomenon, cantilever retaining wall, gabion, geotextile, slope stability, subdrain.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction)
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Edward Piter Siagian
Date Deposited:	26 Jan 2026 09:37
Last Modified:	26 Jan 2026 09:37
URI:	http://repository.its.ac.id/id/eprint/130524

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