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Abstract

Summary

GPR survey was conducted to investigate the presence of voids / cavities in the shallow subsurface that may compromise the construction of a landing pier/jetty/dock for small and medium sized ocean-going vessels. Two major parallel traverse lines and three minor parallel lines that cut perpendicularly across the two major lines were occupied. Panels (which are points of interest) were established on the two major traverse lines. A total of fifteen (15) GPR sections were produced and processed. Data editing, zero-offset correction, DC filtering, dewowing, automatic gain control (AGC), trace equalization, band-pass filtering in frequency domain, NMO correction and migration were applied to process the data. GPR data were constrained with a borehole log and interpreted in terms of the radar facies. Two intercalated radar facies namely; sand and clay are identified. The depth of penetration of the radar signals ranges from 4 m to 14 m. The thickness of the reinforced concrete hardstand across the study area is 0.15 m. Voids / cavities are suspected only at three sampled points with the depth range of 1.1 to 6.3 m.

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/content/papers/10.3997/2214-4609.201802547
2018-09-09
2024-04-19

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Subsurface Utilities Mapping for Engineering Applications Using Ground Penetrating Radar (GPR)
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201802547
/content/papers/10.3997/2214-4609.201802547
/content/papers/10.3997/2214-4609.201802547
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