Abstract
This work covers methods of GPR monitoring of constructions that are quasi-homogeneous ground layers. The monitoring methods include the determination of complex dielectric permittivity and moisture of the construction layers of highways and railways. In order to obtain quantitative values of these parameters the GPR method is calibrated via the measurement of these quantities using the resonance method at frequencies close to the central frequency of the microwave radiation used.
Highlights
Modern large-scale construction and upgrading of highway and railway nets led to the creation of high-performance diagnostic complexes which include the GPR method [1, 2] as a basic geophysical method for diagnostics of the state of extended quasi-homogeneous construction layers [3, 4].Today, the progress in the GPR studies allows successful solving of various engineering problems
Besides the real part of the complex dielectric permittivity, the conductivity (σ) is introduced in the computer model as an additional parameter in order to take these losses into account: σ = σ*+ σcm where σ* is the conductivity of the sample in the container, and σcm is the conductivity of the plastic container material
Δp is assumed to be constant for different construction layers
Summary
The progress in the GPR studies allows successful solving of various engineering problems. In [5,6,7] authors solve the problems of searching and classifying the cracks in the road pavement. The GPR method is used to measure dielectric permittivity and conductivity of soils and building materials [10,11,12]. The GPR method allows estimating the moisture level of constructional and ground layers since the amount of water is the main factor affecting electromagnetic wave propagation [13]. The presence of water in the ground layers significantly affects their mechanical properties and substantially determines reliability and durability of a construction [14, 15]
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