Aplikasi Metode Resistivitas 2D dalam Permodelan Kestabilan Lereng pada Daerah Rawan Longsor Studi Kasus: Desa Olak Alen, Selorejo, Blitar

Asmara, Mella Surya (2017) Aplikasi Metode Resistivitas 2D dalam Permodelan Kestabilan Lereng pada Daerah Rawan Longsor Studi Kasus: Desa Olak Alen, Selorejo, Blitar. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu faktor pemicu terjadinya tanah longsor adalah adanya zona tersaturasi air. Zona tersaturasi air merupakan zona di bawah permukaan yang memiliki konsentrasi air yang tinggi dan sukar untuk meloloskan air. Pengukuran dilakukan pada empat lintasan menggunakan metode geolistrik resistivitas 2D konfigurasi Wenner-Schlumberger. Hasil geolistrik menunjukkan zona saturasi air dengan nilai resistivitas 4,39 – 9,29 Ωm pada kedalaman 6 – 16 meter. Berdasarkan data geologi struktur, arah struktur retakan adalah N 191o E menunjukkan arah pergerakan material longsor secara rotational. Dari hasil data pengeboran, material daerah penelitian seragam yaitu pasir kelanauan. Dilakukan uji laboratorium untuk mengetahui sifat fisis tanah yang digunakan untuk komputasi analisis kestabilan lereng yaitu bobot isi material, kohesi, dan sudut geser dalam. Dari hasil analisis kestabilan lereng menggunakan metode Bishop, lintasan 1 memiliki nilai FK sebesar 1,057 dengan daerah aman adalah 26 meter dari titik longsor; lintasan 2 adalah 1,090 daerah aman 12 meter dari titik longsor; dan lintasan 3 adalah 1,181 daerah aman adalah 9 meter dari titik longsor. Dari analisis data geolistrik, geologi, dan geoteknik terbukti memiliki korelasi satu sama lain dalam analisis kelongsoran pada daerah penelitian. ================================================================= One of the factor that triggers occurence of landslide is the water saturated zone . Water saturated zone is the subsurface zone that has the high water concentration and impermeable of water . Measurements made by four lines that use the 2D resistivity method using Wenner - Schlumberger configuration, the result of the geoelectrical measurement shows the water saturated zone with the range of resistivity 4,39-9,29 Ohm.m at the depth 6 - 16 meter. Based on geological data structure, the structure of the direction of the crack is N 191o E shows the direction of movement of the landslide material are rotational. Based on the drilling data result , the research area material is uniform with silksand(pasirkelanauan). Conducted to laboratory test to get the result of physics characteristic value of land that use to compute the stability analysis of the slope of the material weight,cohesion and internal shear angel . From the analysis of slope stability using Bishop method, Track 1 has FK value 1,057 with the safe zone 26 meter from the landslide point; track 2 is 1,090 from the safe zone 12 meter from the landslide point; track 3 is 1,181 with the safe zone 9 meter from the landslide point. From the analysis of geolelectric, geology and geotechnical data have been shown to correlate with each other in landslide analysis on the observation area.

Item Type: Thesis (Undergraduate)
Additional Information: RSGf 551.307 Asm a
Uncontrolled Keywords: Faktor kemanan, Lereng, Longsor, Resistivitas, Saturasi, landslide, resistivity, safety factor, saturation, slope
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GB Physical geography
Q Science > QE Geology
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > (S1) Undergraduate Theses
Depositing User: Mella Surya Asmara
Date Deposited: 11 Aug 2017 07:33
Last Modified: 24 Nov 2017 08:20
URI: http://repository.its.ac.id/id/eprint/44768

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