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All Journal Spektra: Jurnal Fisika dan Aplikasinya PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Budy Santoso
Departemen Geofisika FMIPA Unpad, Jl.Raya Bandung – Sumedang Km.21, Jatinangor, Sumedang 45363
Aerospace Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics Other

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PENERAPAN METODE GEOLISTRIK-2D UNTUK IDENTIFIKASI AMBLASAN TANAH DAN LONGSORAN DI JALAN TOL SEMARANG – SOLO KM 5+400 – KM 5+800 Budy Santoso
Spektra: Jurnal Fisika dan Aplikasinya Vol 1 No 2 (2016): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 1 Nomor 2, Desember 2016
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (861.073 KB) | DOI: 10.21009/SPEKTRA.012.13

Abstract

Abstrak Amblasan tanah serta longsor yang terjadi di Jalan Tol Semarang – Solo km 5+400 – km 5+800 faktor pemicu utamanya adalah air yang dipermukaan dan dibawah permukaan. Faktor lainnya adalah adanya satuan batulempung dari Formasi Kerek yang berfungsi sebagai bidang gelincir yang berada dibawah jalan tol. Salah satu metode geofisika yang dapat mengidentifikasi amblasan tanah serta longsoran yaitu Metode Geolistrik. Metode Geolistrik dapat mendeteksi amblasan tanah dan bidang longsoran berdasarkan citra resistivitas batuan. Akusisi data geolistrik menggunakan metode lateral mapping-2D konfigurasi Wenner. Pengolahan data menggunakan perangkat lunak Res2Dinv. Berdasarkan penampang resistivitas yang telah dikorelasikan dengan data bor dan geologi setempat, maka diperoleh jenis batuan dan nilai resistivitasnya sebagai berikut : batulempung menyerpih padat : < 6 Ohm.m, pasir kerikil kerakal bongkah padat : (6 – 20) Ohm.m, lempung lanauan sedikit pasir : (21 – 35) Ohm.m dan lanau lempungan berkerikil sedikit boulder : (36 – 160) Ohm.m. Kata kunci : resistivitas, amblasan tanah, bidang gelincir, longsoran. Abstract Land subsidence and landslides occuring on Highway Semarang - Solo km 5+400 – km 5+800 main trigger factor is water of surface and subsurface. Another factor is presence claystone of Formation Kerek which serves as a sliding plane under highway. One of geophysical methods to identify land subsidence and landslides is Geoelectric Method. Geoelectric Method can detect land subsidence and landslides plane based resistivity imaging of rock. Geoelectric data acquisition using 2D-lateral mapping method of Wenner configuration. Data processing using Res2Dinv software. Based on cross-section resistivity has been correlated with drill data and local geology, it is obtained lithology and resistivity value as follows: shale claystone of solid < 6 Ohm.m, gravel sand of solid lumps : (6 - 20) Ohm.m, silty clay of sand slightly : (21 - 35) Ohm.m and clayey silt pebbly slightly boulder : (36 - 160) Ohm. Keywords: resistivity, land subsidence, sliding plane, landslide.
PENGARUH MUKA AIR TANAH TERHADAP KESTABILAN JEMBATAN MENGGUNAKAN METODE ELECTRICAL RESISTIVITY TOMOGRAPHY KONFIGURASI DIPOLE-DIPOLE Budy Santoso; Setianto Setianto; Bambang Wijatmoko; Eddy Supriyana
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.477 KB) | DOI: 10.21009/03.SNF2017.02.EPA.02

Abstract

Ground water is one of the factors that affect the stability of a bridge. One of the Geophysical Methods that can identify the presence of groundwater is Electrical Resistivity Tomography (ERT) method. Configuration of ERT measurement using Dipole-Dipole Configuration. Based on ERT measurements that have been correlated with local geology, the following results are obtained: porous pile soil has a resistivity value : (42 - 58) Ohm.m, below the porous layer there is a water table with resistivity value: (24 - 30) Ohm.m at depth : (6 - 10) m, and the lowest layer is a impermeable layer suspected of Claystone with resistivity value : (40 - 100) Ohm.m. This claystone is impermeable, consequently the groundwater that is in the layer will flow at lower altitude by bringing the material in the form of soil / rock that is covered by the coating, so that the soil / rock under the bridge becomes unstable. Keywords: groundwater, dipole-dipole, ERT, resistivity
PENGUKURAN DAN ANALISIS GRAVITY UNTUK PENENTUAN PROSPEK MINERALISASI BIJIH BESI DI DAERAH SUNGAI PADANG, SIJUK, BELITUNG Eddy Supriyana; Budy Santoso; Bambang Wijatmoko
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1001.765 KB) | DOI: 10.21009/03.SNF2017.02.EPA.03

Abstract

Research with Gravity method has been done in Padang River Village of Belitung Province. The purpose of this research is to know the pattern of the potential spread of iron ore, to localize the spread of iron ore and to determine the position of rock intrusion containing mineralization. Gravity data obtained from the measurement results, then modeled to estimate the price of rock density from some subsurface layer. Based on the value of the density contrast is correlated with the porosity (small), then the rock characteristics will be identified so that the tendency of the existence of Seal rocks and Trapping sources can be known. Gravity measurements are done systematically with intervals between observation stations on one line of 25 meters, while the distance between lines of about 500 meters. Bouguer anomaly in the study area ranged from -5 until 75 mGal, forming as low and high anomaly. The height of the Anomaly Bouguer occupies the western part of the study site, its value reaches 30 mGal and to the north of the research area reaches 42 mGal, the height of the North-South trending anomaly flanked by two high anomaly groups. Keywords: Gravity, Bouguer Anomaly, Density, Iron Ore, Mineralization
Co-Authors Bambang Wijatmoko Eddy Supriyana Setianto Setianto