Estimating Thickness of Defects at Rock-Concrete Lining Interface by Ground-Penetrating Radar
E. V. Denisova1, K. O. Sokolov2, A. P. Khmelinin1, A. I. Konurin1, D. V. Orlov1
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russia
Keywords: Concrete lining, internal, rock mass, finite-difference time-domain method, electromagnetic properties, ground-penetrating radar
Abstract
Ground-penetrating radar is used to study defects in the form of internal layers in concrete structures. It is found that modulus of deflection coefficient of GPR signals changes as function of the layer thickness and electromagnetic properties of the material filling the layer (sand, wet sand or air). The experimental and numerical research used the method of peak-to-peak amplitude ratio, which enabled determining the Fresnel coefficients for the upper and lower boundaries of a layer. The minimal layer thickness recorded by GPR was 2 mm.
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