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All Journal Journal of Degraded and Mining Lands Management Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Ruchimat, Acep
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Physics

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Geophysical methods reveal a subsurface historic wastewater tunnel exposed by a sinkhole: a case study in Bandung City, Indonesia Parnadi, Wahyudi Widyatmoko; Warsa, Warsa; Nailufar, Mira; Jubaedah, Neng Endah; Ruchimat, Acep
Journal of Degraded and Mining Lands Management Vol. 12 No. 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.122.7265

Abstract

Bandung City, the capital of West Java Province in Indonesia, has changed its physical face rapidly due to the many constructions of office buildings, hotels, and other facilities until now. To avoid the instability of existing buildings and for building construction in the future, knowledge of the subsurface conditions in the city must be enhanced. A sudden soil collapse in the yard of the PAG Building occurred in early 2018 and resulted in a sinkhole with a diameter of 5 m, which revealed a historic wastewater tunnel structure in the subsurface. Non-invasive, low-cost, and time-effective geophysical methods to solve those problems are proposed. Ground-penetrating radar (GPR) and Electrical Resistivity Tomography (ERT), widely applied to identify artificial objects underground, came to be used for these purposes. A research to know the suitability of both methods for application began with numerical simulation, followed by field measurement on 4 GPR and ERT lines and analysis of each method. The results show that GPR data, through both numerical and field data,  could identify and locate the tunnel in a radargram due to its hyperbola shape, whereas ERT data provided the property contrast between the tunnel and its host. The results suggest that GPR and ERT techniques are effective for revealing water tunnels in the study area with a maximum depth of 1.8 m and a 65% reduction in size. These findings can be used as a guide to using both methods to reveal the water tunnel network in the central part of Bandung City for sustainable urban planning.
Penerapan Metode Multichannel Analysis of Surface Waves (MASW) untuk Interpretasi Bawah Permukaan sebagai Kontribusi Pembangunan Infrastruktur di Ibu Kota Nusantara (IKN) Handoyo, Handoyo; Alfatih, Zhilan Zhalilla Puti; Ruchimat, Acep; Wiyono, Wiyono; Akin, Özgenç; Andika, Putu Pradnya
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 3 (2025): Agustus
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i3.1187

Abstract

Ibu Kota Nusantara (IKN), yang akan ditetapkan sebagai pusat pemerintahan baru Indonesia di Kalimantan Timur, saat ini berada dalam tahap awal pengembangan infrastruktur yang mencakup kebutuhan mendasar seperti transportasi, utilitas publik, dan fasilitas penunjang lainnya. Kawasan Ibu Kota Nusantara (IKN) menuntut kajian geoteknik yang komprehensif untuk menjamin daya dukung tanah dan stabilitas struktur jalan tol. Untuk mendukung perencanaan dan pelaksanaan konstruksi secara aman dan efisien, pemahaman mengenai karakteristik geoteknik lapisan bawah permukaan menjadi sangat penting. Metode Multichannel Analysis of Surface Waves (MASW) merupakan salah satu pendekatan geofisika non-destruktif yang efektif dalam mengidentifikasi distribusi kecepatan gelombang geser (Vs). Prosedur MASW mencakup akuisisi data seismik, transformasi Fourier, pembentukan kurva dispersi frekuensi-kecepatan, serta inversi untuk menghasilkan distribusi Vs secara vertikal dan lateral. Berdasarkan distribusi nilai Vs, hasil analisis menunjukkan bahwa kecepatan gelombang geser di lokasi penelitian terdiri dari 4 lapisan utama, yaitu clay atau tanah lempung lunak (140-150 m/s), silty clay (150-200 m/s), medium to dense sands (200-400 m/s) dan gravels (>400 m/s). Analisis Vs yang dihasilkan memberikan informasi kritis untuk menentukan fondasi dapat dibangun sekiranya pada kedalaman >10 m. Dengan demikian, penerapan MASW diproyeksikan mampu menjembatani kesenjangan data geoteknik dan mendukung perencanaan konstruksi jalan tol di IKN secara lebih efektif dan efisien.
Co-Authors Akin, Özgenç Alfatih, Zhilan Zhalilla Puti Andika, Putu Pradnya Handoyo Handoyo Jubaedah, Neng Endah Nailufar, Mira Parnadi, Wahyudi Widyatmoko Warsa Warsa Wiyono wiyono