Zakki, Muhammad (2023) Studi Stabilitas Lereng Menggunakan Metode Kesetimbangan Batas Dengan Pendekatan Deterministik Dan Probabilistik Studi Kasus : Longsoran Jalan Nasional Ruas Mota'ain-Motamasin, Nusa Tenggara Timur. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Ruas jalan Mota'ain-Motamasin merupakan ruas jalan yang dibangun dalam rangka realisasi pembangunan infrastruktur di kawasan perbatasan di Nusa Tenggara Timur yang berbatasan dengan Timor Leste. Pada ruas tersebut, pembangunan jalan telah selesai, namun di beberapa titik mengalami kelongsoran yang perlu ditangani. Penelitian yang dilakukan meliputi pemodelan dan uji di laboratorium. Uji sifat fisik, mekanik, suction, dan uji XRD dilakukan pada sampel. Dilakukan analisa balik untuk mendapatkan parameter tanah ketika longsor. Kemudian dianalisa stabilitas lereng Sta 149+140, Sta 150+550, dan Sta 153+500 secara deterministik dan probabilistik serta dilakukan analisa sensitivitas parameter tanah terhadap nilai Safety Factor. Tanah Bobonaro tergolong Cohesive Soil dan memiliki nilai LL = 80,823% dan PI = 58,747%, terklasifikasi sebagai tanah CH (High Plasticity Clay). Tanah Bobonaro memiliki kadar kaolinite 3,4%-17,9%, illite 16,6%-42,6%, dan montmorillonite 9,6%-30,6%. Kombinasi kaolinite yang sedikit dan montmorillonite yang tinggi disertai perubahan kadar air yang tinggi adalah penyebab sering terjadinya longsor di ruas jalan mota’ain-motamasin. Pada Sta 149+140, nilai SF = 1.249 pada MAT 0 m menjadi SF = 1.254 pada MAT -5 m secara probabilistik 10.000 iterasi. Begitu pula Sta 150+550 dan Sta 153+500, SF meningkat ketika MAT diturunkan. Nilai SF = 1.254 tanpa suction menjadi SF = 1.263 ketika adanya suction pada MAT -5 m secara probabilistik 10.000 iterasi. Pada Sta 150+550 dan Sta 153+500, SF juga mengalami peningkatan akibat suction. Parameter tanah yang paling sensitif pada Safety Factor adalah kohesi, diikuti sudut geser dalam dan berat volume. Penanganan longsor Sta 149+140 digunakan bore pile dengan SF=1.808 > SF=1.5. Pada Sta 150+550 dan Sta 153+550 digunakan geotextile dan gabion dengan SF=1.725 > SF=1.5 untuk Sta 150+550 dan SF = 1.724 > SF = 1.5 pada Sta 153+550. Geomembran ditambahkan pada bagian atas muka tanah untuk menjaga tidak terjadi perubahan kadar air yang signifikan
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The Mota'ain-Motamasin road section is a road section that was built in the realization of infrastructure development in the border area in East Nusa Tenggara which borders Timor Leste. On this section, road construction has been completed, but at several points there are landslides that need to be addressed. Research conducted includes modeling and testing in the laboratory. Physical, mechanical, suction and XRD tests were carried out on the samples. Back analysis was carried out to obtain soil parameters during landslides. Then analyzed the stability of the slopes Sta 149+140, Sta 150+550, and Sta 153+500 deterministically and probabilistically and analyzed the sensitivity of soil parameters to the value of Safety Factor. Bobonaro soil is classified as Cohesive Soil and has a value of LL = 80.823% and PI = 58.747%, classified as CH (High Plasticity Clay) soil. Bobonaro soil has kaolinite content of 3.4%-17.9%, illite 16.6%-42.6%, and montmorillonite 9.6%-30.6%. The combination of little kaolinite and high montmorillonite accompanied by high changes in water content is the frequent cause of landslides on the mota'ain-motamasin roads. At Sta 149+140, the value of SF = 1,249 at MAT 0 m becomes SF = 1,254 at MAT -5 m probabilistically 10,000 iterations. Likewise Sta 150+550 and Sta 153+500, SF increases when MAT is lowered. The value of SF = 1,254 without suction becomes SF = 1,263 when there is suction at MAT -5 m probabilistically 10,000 iterations. At Sta 150+550 and Sta 153+500, SF also experienced an increase due to suction. The most sensitive soil parameter on the Safety Factor is cohesion, followed by the internal shear angle and unit weight. Handling of Sta 149+140 landslides used bore piles with SF=1.808 > SF=1.5. At Sta 150+550 and Sta 153+550 geotextile and gabion were used with SF=1.725 > SF=1.5 for Sta 150+550 and SF = 1.724 > SF = 1.5 at Sta 153+550. Geomembranes are added to the top of the soil surface to prevent significant changes in water content
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Slope stability, Safety Factor, Limit Equilibrium, Monte Carlo Probabilistic, Sensitivity analysis, Stabilitas lereng, Safety Factor, Kesetimbangan Batas, Probabilistik Monte Carlo, Analisa sensitivitas |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA169 Reliability (Engineering) 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: | MUHAMMAD ZAKKI |
| Date Deposited: | 04 Feb 2023 08:36 |
| Last Modified: | 04 Feb 2023 08:41 |
| URI: | http://repository.its.ac.id/id/eprint/96160 |
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