Ground penetrating radar (GPR) is a non-invasive tool used to detect subsurface features, which are vital in construction, archaeology, and environmental studies. Recent advancements have significantly enhanced its utility. AI integration now automates data interpretation, improving accuracy and reducing costs. Its portable, user-friendly units allow for broader field use, and 3D imaging and GPS integration enable precise mapping. Enhanced antennas and software offer deeper penetration and clearer visuals, while mobile mapping integration streamlines infrastructure surveys. These innovations make GPR more accessible, efficient, and versatile across industries.
Tunnel Vision: Secrets Beneath the Surface
RETTEW conducted a geophysical survey using GPR to investigate subfloor structures beneath a warehouse. We designed the survey to verify the presence of air-filled tunnels previously identified by the client. The warehouse floor consisted of a top layer of reinforced concrete, a middle layer of brick, and a lower layer of concrete. A visible tunnel section in the southwest corner revealed concrete walls and I-beam-supported ceilings, though debris and groundwater obscured the tunnel floor.
RETTEW performed GPR scanning in a 2-foot by 2-foot grid using multi-frequency antennas. Rebar interference limited signal penetration to about 3 feet. Post-processing of the GPR data using Screening Eagle Insights software included noise reduction and signal enhancement, resulting in 2D and 3D subsurface models. Findings in the northern section of the warehouse confirmed a grid-like pattern of air-filled tunnels with I-beam-supported roofs and fill material between them. Four anomalies in the Northern Room appeared to be thickened slabs above possible pilings. In contrast, the Southern Room showed no tunnels but had six reinforced concrete areas above suspected pilings and four filled-in pits. We attributed the remaining anomalies to rebar density or variations in rebar placement.
Introducing Sean Harris-Clark
Senior Utility Locator
What do buried utilities and ostriches have in common? For Sean Harris-Clark, every locate is an adventure because solving decades-old utility puzzles can lead to some wild surprises!
