3D DCR Modelling for Detection of Subsurface Weak Zones Beneath Buildings Using Surface and Borehole Configurations
Near Surface Geoscience Conference & Exhibition 2026 , Thessaloniki, Yunanistan, 19 - 24 Eylül 2026, ss.1-5, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.3997/2214-4609.202620112
- Basıldığı Şehir: Thessaloniki
- Basıldığı Ülke: Yunanistan
- Sayfa Sayıları: ss.1-5
- Ankara Üniversitesi Adresli: Evet
Özet
Subsurface weak zones beneath buildings pose significant risks to structural stability in urban environments. This study evaluates the effectiveness of 3D direct current resistivity (DCR) imaging using various electrode configurations to detect these features. A comparative 3D modelling approach was conducted using the R3t algorithm on unstructured tetrahedral meshes generated with TetGen. Results demonstrate that the performance of 3D DCR imaging is highly dependent on spatial coverage. While conventional surface-based arrays (DD and PD) provide adequate sensitivity for near-surface features, they fail to resolve deeper targets under high-resistivity conditions. Conversely, borehole-to-borehole configurations significantly improve deep anomaly detection but remain insensitive to structures outside the inter-borehole zone. The joint inversion of surface and borehole-based datasets emerged as the optimal approach, successfully bridging the gap between shallow and deep imaging with high accuracy and model stability. These findings highlight that integrated borehole-supported hybrid arrays are critical for accurate structural safety assessments in complex near-surface geophysical investigations.