Nugraha, Galdino Aditya Nugraha (2026) Pengembangan Alat Uji Kolom Pasir Dan Studi Eksperimental Untuk Pemodelan Laboratorium Porositas, Permeabilitas, Dan Resistivitas Dengan Variasi Ukuran Butir Dan Tegangan Vertikal. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini mengembangkan dan menguji sebuah alat kolom pasir berpori untuk pemodelan laboratorium sifat porositas, permeabilitas, dan resistivitas pada media pasir dengan variasi ukuran butir dan tegangan vertikal. Kolom silinder berdiameter dalam 10 cm dan tinggi efektif 12 cm dilengkapi sistem aliran kepala konstan dan konfigurasi empat elektroda (Wenner) sehingga pengukuran hidraulik dan kelistrikan dapat dilakukan secara terintegrasi. Tiga jenis pasir (Lumajang, silika, dan pasir bangunan) dipisah menjadi tiga fraksi ukuran nominal (±1,18; 0,60; 0,30 mm) dan diuji pada sembilan tingkat pembebanan (W0–W8). Porositas dihitung dari massa kering dan volume kolom, permeabilitas jenuh diperoleh dari debit dan gradien hidrolik berdasarkan Hukum Darcy dan dinyatakan dalam Darcy, sedangkan resistivitas bulk dihitung dari beda potensial dan arus dengan faktor geometri kolom. Porositas sampel berada pada kisaran 23–37%, permeabilitas jenuh sekitar 8–13 Darcy (orde 10⁻¹¹ m², setara hydraulic conductivity ±10⁻⁴ m/s), resistivitas bulk berada di kisaran ~0,065–0,09 Ωm dan hanya mengalami perubahan kecil (beberapa mili‑ohm‑meter) ketika porositas dan permeabilitas berubah cukup signifikan akibat kompaksi. Peningkatan tegangan vertikal secara umum menurunkan porositas dan permeabilitas serta menaikkan resistivitas pada semua kombinasi jenis dan ukuran pasir, dengan perubahan terbesar terjadi pada tahap pembebanan awal. Secara keseluruhan, tren hubungan porositas–permeabilitas–resistivitas yang diperoleh konsisten dengan kerangka Hukum Darcy dan Archie, sehingga alat kolom yang dikembangkan berpotensi digunakan sebagai model laboratorium sederhana untuk studi petrofisika dan hidrogeologi pada material pasir.
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This study develops and tests a porous sand column apparatus to experimentally model porosity, permeability, and resistivity of sandy media under varying grain size and vertical stress. The cylindrical column has an inner diameter of 10 cm and an effective sample height of 12 cm, and is equipped with a constant‑head flow system and a four‑electrode Wenner configuration to perform integrated hydraulic and electrical measurements. Three sand types (Lumajang sand, silica sand, and construction sand) were each separated into three nominal grain‑size fractions (±1.18, 0.60, and 0.30 mm) and tested under nine loading stages (W0–W8). Porosity was calculated from dry mass and column volume, saturated permeability was obtained from discharge and hydraulic gradient using Darcy’s law and expressed in Darcy, and bulk resistivity was computed from voltage and current measurements using an appropriate geometric factor. Sample porosity ranges from 23 to 37%, saturated permeability from about 8 to 13 Darcy (on the order of 10⁻¹¹ m², equivalent to a hydraulic conductivity of approximately 10⁻⁴ m/s), Bulk resistivity is in the range of ~0.065–0.09 Ωm and only experiences small changes (a few milli‑ohm‑meters) when porosity and permeability change significantly due to compaction. Increasing vertical stress generally reduces porosity and permeability and increases resistivity for all sand types and grain‑size fractions, with the largest changes occurring at the early loading stages when the packing is still loose. Overall, the observed porosity–permeability–resistivity trends are consistent with the frameworks of Darcy’s law and Archie’s law, indicating that the developed sand column apparatus has good potential as a simple laboratory model for petrophysical and hydrogeological studies in sandy materials.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Permeameter, Porositas, Permeabilitas, Resistivitas, Ukuran Butir, Beban Vertikal, Hukum Darcy, Hukum Archie, Permeameter, Porosity, Permeability, Resistivity, Grain Size, Vertical Load, Darcy's Law, Archie's Law |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Galdino Aditya Nugraha |
| Date Deposited: | 20 Jul 2026 08:20 |
| Last Modified: | 20 Jul 2026 08:20 |
| URI: | http://repository.its.ac.id/id/eprint/135735 |
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