Fuji Lestari, - (2022) ANALISIS KESTABILAN LERENG, KECEPATAN, SERTA JARAK JANGKAUAN LONGSOR MENGGUNAKAN METODE GEOLISTRIK RESISTIVITAS DAN MEKANIKA TANAH DI DESA MARGAMULYA KECAMATAN PASIRJAMBU KABUPATEN BANDUNG. S1 thesis, Universitas Pendidikan Indonesia.
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Abstract
Longsor merupakan bencana alam yang sering terjadi di Indonesia, terutama di daerah perbukitan seperti di Kecamatan Pasirjambu, Kabupaten Bandung. Sebagai mitigasi bencana tanah longsor diperlukan pengetahuan mengenai penentuan kecepatan dan jarak jangkauan longsor. Penelitian ini menerapkan metode geolistrik resistivitas dan mekanika tanah dalam menganalisis kestabilan lereng, kecepatan dan jarak jangkauan longsor di Desa Margamulya, Kecamatan Pasirjambu, Kabupaten Bandung. Metode geolistrik resistivitas (Electrical Resistivity Tomography) digunakan pada dua lintasan berbeda, dengan konfigurasi dipole-dipole dan wenner-schlumberger. Berdasarkan mekanika tanah, dilakukan pengambilan sampel tanah ke lapangan dan pengujian laboratorium untuk menentukan karakteristik sifat fisik tanah dan kuat geser tanah. Berdasarkan informasi tersebut, dilakukan pemodelan untuk menganalisis kestabilan lereng menggunakan aplikasi GeoStudio SLOPE/W dan pyBIMstab. Metode Morgenstern-Price diterapkan untuk menganalisis potensi bidang gelincir yang berpotensi untuk bergerak. Model gesekan Coulomb sederhana dengan pendekatan pusat massa digunakan untuk memprediksi kecepatan dan jarak jangkauan longsor. Hasil profil ERT menunjukkan bahwa geometri pada lokasi penelitian berbentuk lingkaran (circular sliding surface). Hasil pengujian laboratorium menunjukkan karakteristik sifat fisik tanah berupa tanah lanau dengan kohesi efektif 0 kPa dan sudut geser dalam tanah efektif 25,94°. Berdasarkan analisis profil ERT kedalaman bidang gelincir pada lintasan #1 dan #3 terdapat pada kedalaman 7,09 m dan 11,81 m; berdasarkan pemodelan stabilitas lereng: GeoStudio SLOPE/W dan pyBIMstab untuk lintasan #3 bidang gelincir pada kedalaman 11,81 m dan 11,84 m; untuk lintasan #1 pemodelan GeoStudio SLOPE/W bidang gelincir pada kedalaman 7,09 m dan pyBIMstab pada kedalaman 5,8 m. Prediksi jarak jangkauan longsor sebesar 63,17 m dengan kecepatan sebesar 10,9 m/s, termasuk pergerakan sangat cepat (extremely rapid) yang dapat berdampak pada infrastruktur berupa tertutupnya jalan Desa Margamulya oleh bahan longsoran. Landslides are natural disasters that often occur in Indonesia, especially in hilly areas such as in Pasirjambu District, Bandung Regency. As a landslide disaster mitigation, knowledge about determining landslide run-out distance is needed. This study applies geoelectric resistivity and soil mechanics methods in analyzing slope stability, velocity and landslides run-out distance in Margamulya Village, Pasirjambu District, Bandung Regency. The geoelectric resistivity method (Electrical Resistivity Tomography) is used on two different paths, namely the dipole-dipole and Wenner-Schlumberger configurations. Based on soil mechanics, soil samples were taken to the field and laboratory tests were carried out to determine the physical characteristics of the soil and the shear strength of the soil. Based on this information, modeling was carried out to analyze slope stability using GeoStudio SLOPE/W and pyBIMstab applications. The Morgenstern-Price method is applied to analyze the potential of the slip surface that has the potential to move. A simple Coulomb friction model with a center of mass approach is used to predict the velocity and run-out distance of landslides. The results of the ERT profile show that the geometry at the research site is circular sliding surface. The results of laboratory tests showed the physical characteristics of the soil in the form of silt with a effective cohesion of 0 kPa and effective friction angle 25.94°. Based on the analysis of the ERT profile, the depth of the slip surface on path #1 and #3 is at a depth of 7.09 m and 11.81 m; based on slope stability modeling: GeoStudio SLOPE/W and pyBIMstab for path #3 the slip surface at a depth of 11.81 m and 11.84 m; while for path #1 the GeoStudio SLOPE/W modeling is at a depth of 7.09 m and pyBIMstab is at a depth of 5.8 m. The predicted range of landslides is 63.17 m with a velocity of 10.9 m/s, including very fast movements (extremely rapid), which can have an impact on infrastructure in the form of closing the Margamulya village road by landslides.
| Item Type: | Thesis (S1) |
|---|---|
| Additional Information: | ID Sinta Dosen Pembimbing: 1. Selly Feranie 5978969 2. Adrin Tohari |
| Uncontrolled Keywords: | Stabilitas Lereng, Longsor, Geolistrik Resistivitas, Sifat Fisik dan Kuat Geser Tanah, Bidang Gelincir Lingkaran, Jarak Jangkauan Longsor. |
| Subjects: | L Education > L Education (General) |
| Divisions: | Fakultas Pendidikan Matematika dan Ilmu Pengetahuan Alam > Jurusan Pendidikan Fisika > Program Studi Fisika (non kependidikan) |
| Depositing User: | Fuji Lestari |
| Date Deposited: | 02 Sep 2022 09:02 |
| Last Modified: | 02 Sep 2022 09:02 |
| URI: | http://repository.upi.edu/id/eprint/77383 |
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