Zufadhli, Zulfadhli (2025) Analisa Stabilitas Lereng pada Kondisi Siklus Pembasahan dan Pengeringan di Area Ruas Jalan Nasional (Studi Kasus: Penanganan Longsoran Batas Pidie/Aceh Besar – Batas Kota Sigli). Masters thesis, Institut Teknologi Sepuluh November.
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Abstract
Ruas Jalan Nasional Bts. Pidie/Aceh Besar – Bts. Kota Sigli Sta. 0+500 s.d 0+750 berada di Kabupaten Pidie yang beriklim tropis sehingga mengalami pembasahan pada musim hujan dan pengeringan pada musim kemarau akibat perubahan cuaca di sepanjang tahun. Peristiwa longsor yang terjadi pada puncak musim penghujan tahun 2023 didahului oleh fluktuasi curah hujan yang signifikan pada bulan – bulan sebelumnya. Longsoran berbentuk U-shape/tapal kuda sepanjang lebih kurang 60 meter dengan kedalaman bidang longsor mencapai lebih kurang 20,5 meter. Laporan hasil penyelidikan tanah menunjukkan, lapisan tanah 0 - 5 meter berupa lapisan lempung dan lempung lanau berpasir dengan plastisitas sedang, kekakuan sangat lunak hingga sedang serta kadar air sedang hingga tinggi. Derajat kejenuhan (Sr) berkisar antara 53,71 – 83,97% yang menunjukkan kondisi tak jenuh zona dua fase/transisi. Sudut geser (Φ) antara 5,146 – 8,714°, kohesi (c) antara 0,040 – 0,499 kg/cm2 dan kuat tekan (qu) berkisar antara 0,552 – 1,91 kg/cm2. Penelitian bertujuan untuk mengetahui sejauh mana pengaruh cuaca pada perubahan parameter fisik dan mekanis tanah serta pengaruhnya terhadap kestabilan lereng ruas jalan tersebut. Sampel yang akan diuji diambil dari lokasi longsor. Pengujian di laboratorium meliputi pengujian parameter fisik, parameter mekanik serta pengeringan dan pembasahan (dry-wetting). Proses pembasahan dilakukan dengan cara menambahkan kadar air dari kondisi awal (wi) sampai kondisi kadar air jenuh (wsat), variasi penambahan kadar air sebesar 25%, 50%, 75%, dan 100% dari selisih kondisi kadar air. Sedangkan proses pengeringan dilakukan dengan cara mengurangi kadar air dari kondisi awal (wi) sampai kondisi kadar air kering udara(wairdry), variasi pengurangan kadar air sebesar 25%, 50%, 75%, dan 100% dari selisih kadar air. Hasil pengujian pembasahan – pengeringan menunjukkan peningkatan berat volume kering (γd) sebesar 2,28% diikuti oleh penurunan angka pori (e) sebesar 4,43% dari siklus 1 ke siklus 2, penurunan kuat tekan bebas (qu) sebesar 22,70 %, dan penurunan tegangan air pori negatif (-uW) sebesar -53,14%. Selanjutnya, dari hasil analisis kestabilan lereng diperoleh pada kondisi inisial nilai FS sebesar 1,38, sedangkan pada kondisi setelah pengeringan dan pembasahan, lereng sudah dalam keadaan runtuh (FS<1).
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National Road Section Bts. Pidie/Aceh Besar - Bts. Kota Sigli Sta. 0+500 to 0+750 is located in Pidie Regency which has a tropical climate that experiences wetting in the rainy season and drying in the dry season due to weather changes throughout the year. The landslide event that occurred at the peak of the rainy season in 2023 was preceded by significant rainfall fluctuations in the previous months. The landslide was in the shape of a U/horseshoe approximately 60 meters long with the depth of the landslide reaching approximately 20.5 meters. The soil investigation report shows that the soil layer 0-5 meters is a layer of clay and sandy silt loam with medium plasticity, very soft to medium stiffness, and medium to high water content. The degree of saturation (Sr) ranges from 53.71 - 83.97% which indicates the unsaturated condition of the two-phase/transition zone. Shear angles (Φ) ranged from 5.146 - 8.714°, cohesion (c) ranged from 0.040 - 0.499 kg/cm2, and compressive strength (qu) ranged from 0.552 - 1.91 kg/cm2. The study aims to determine the extent of the influence of weather on changes in the physical and mechanical parameters of the soil and its effect on the stability of the slope of the road section. Samples to be tested were taken from the landslide site. Laboratory testing included physical parameters, mechanical parameters, and dry-wetting. The wetting process is carried out by adding water content from the initial condition (wi) to the saturated water content condition (wsat), the variation of adding water content is 25%, 50%, 75%, and 100% of the difference in water content conditions. While the drying process is carried out by reducing the water content from the initial condition (wi) to the condition of air dry water content (wairdry), the variation of water content reduction is 25%, 50%, 75%, and 100% of the difference in water content. The dry-wetting test results showed an increase in dry volume weight (γd) by 2.28% followed by a decrease in pore number (e) by 4.43% from cycle 1 to cycle 2, a decrease in free compressive strength (qu) by 22.70%, and a decrease in negative pore water tension (-uW) by -53.14%. Furthermore, from the results of the slope stability analysis obtained in the initial condition, the FS value is 1.38, while in the condition after drying and wetting, the slope is already in a state of collapse (FS < 1).
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | longsor, pengeringan dan pembasahan, stabilitas lereng, angka keamanan, landslide, dry-wetting, slope stability, safety factor. |
| 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) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | ZULFADHLI ZULFADHLI |
| Date Deposited: | 24 Jan 2025 03:22 |
| Last Modified: | 24 Jan 2025 03:22 |
| URI: | http://repository.its.ac.id/id/eprint/116337 |
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