Mahfud, Saiful (2026) Analisa Stabilitas Lereng Galian dengan Metode Elemen Hingga di Proyek Pembangunan Jalan Bululawang-Sidomulyo-Tambakrejo STA 14+675 Kabupaten Blitar, Provinsi Jawa Timur. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pembangunan Jalan Bululawang–Sidomulyo–Tambakrejo sebagai bagian dari Jalan Lintas Selatan Jawa Timur menghadapi tantangan geoteknik berupa ketidakstabilan lereng pada lokasi galian STA 14+675. Lokasi tersebut merupakan daerah galian dengan ketinggian galian sisi barat dengan tinggi 50,00 m dan sisi timur tinggi 10,00 m. Terdapat kejadian longsor pada lereng sisi timur sedangkan tidak terjadi kelongsoran pada sisi barat. Diperlukan penelitian lebih lanjut untuk mengetahui penyebab kelongsoran pada sisi lereng sebelah timur dan analisa terhadap potensi kelongsoran pada lereng sebelah barat. Data yang digunakan merupakan data sekunder meliputi uji SPT, uji laboratorium sifat fisik dan mekanis tanah, topografi galian lereng, dan Geolistrik. Tahapan analisa yang dilakukan adalah integrasi data geolistrik untuk mengetahui stratifikasi batuan dan muka air tanah kemudian dilakukan analisa topografi dari DEMNAS yang diolah menggunakan aplikasi Global Mapper dan Arcgis. Hasil yang diperoleh adalah kondisi lereng sisi timur adalah sebesar 1,552 dan lereng sisi barat sebesar 1,800. Keruntuhan lereng sisi timur terjadi akibat kejenuhan tanah dikarenakan berada pada daerah cekungan sebagaimana ditunjukan dari hasil topografi. Pemodelan kejenuhan tanah pada plaxis dengan variasi ketinggian muka air tanah. Pada ketinggian MAT 9,5 meter dari kaki lereng menghasilkan nilai SF <1 (Mstages <1) yang menandakan keruntuhan lereng. Upaya peningkatan stabilitas dilakukan pada lereng sisi timur dengan melakukan pelandaian kemiringan 1V:1H menghasilkan niali SF sebesar 1,802. Sementara itu, lereng sisi barat tidak memerlukan peningkatan stabilitas lereng karena geometri desain eksisting dengan rasio 4V:1H telah memenuhi standar keamana yang disyaratkan.
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The road construction of the Bululawang–Sidomulyo–Tambakrejo, as part of the Trans South South Java Road Project corridor in East Java Province is subject to geotechnical challenges related to landslide at the excavation site STA 14+675. This location comprises an excavation area with a cut slope height of approximately 50.00 m on the western side and 10.00 m on the eastern side. A landslide has occurred on the eastern slope, whereas no failure has been observed on the western slope. Further investigation is required to determine the the causes of slope failure on the right side and to assess the landslide potential on the left slope. The data used in this study consist of secondary data, including Standard Penetration Test (SPT) results, laboratory test data of soil physical and mechanical properties, slope excavation topography, and geoelectrical data. The analysis stages involve the integration of geoelectrical data to identify subsurface stratification and groundwater levels, followed by topographic analysis derived from DEMNAS data processed using Global Mapper and ArcGIS software. The obtained results indicate a Safety Factor (SF) of 1.552 for the eastern slope and 1,800 for the western slope. Slope failure on the eastern side is attributed to soil saturation, as the area is situated within a topographical depression (basin), as confirmed by the survey results. Soil saturation was modeled in PLAXIS by varying the groundwater level (GWL). A GWL height of 9.5 meters from the toe of the slope resulted in an SF < 1 (Mstages < 1), indicating slope failure. Consequently, stability improvement measures were implemented on the eastern slope by regrading it to a 1V:1H ratio, which yielded an SF of 1.802. Conversely, the western slope requires no further stabilization, as the existing design geometry with a 4V:1H ratio already complies with the required safety standards.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | stabilitas lereng, longsoran, Plaxis 3D, faktor keselamatan, perkuatan lereng, finite element,slope stability, landslide, Plaxis 3D, safety factor, slope reinforcement, finite element |
| 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: | Saiful Mahfud |
| Date Deposited: | 26 Jan 2026 08:34 |
| Last Modified: | 26 Jan 2026 08:35 |
| URI: | http://repository.its.ac.id/id/eprint/130531 |
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