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Road operation in areas with frozen soils requires monitoring of subgrade soils due to seasonal changes of their properties as well as development of negative cryogenic processes. Monitoring subgrade soil properties and condition is most effective using GPR. The results of theoretical and experimental studies of subgrade soils of roads in the North revealed the main wave characteristics of GPR data...
The NeTTUN (New Technologies for Tunnelling and Underground Works) Project involves a consortium of 23 industrial, research & development laboratories and small and medium enterprise organizations across 9 countries in Europe; the ultimate goal is to enable groundbreaking change in the construction and maintenance of tunnels. Most existing ground prediction methods require the stopping of excavation...
Simulation of electromagnetic wave propagation in lossy and dispersive media requires a realistic description of the electrical and dielectric media parameters. We measured the complex dielectric permittivity of fine sand and silty clay in the GPR frequency range using the coaxial transmission line technique. We inverted the data with single- and multi-pole Debye models and a constant dc conductivity...
A theoretical method to relate the electrical relative permittivity (dielectric constant) and thermal conductivity of sands is presented. Extensive previous work has been done to relate the physical state (void ratio, water content, and saturation percent) of sandy soils to the bulk thermal conductivity and bulk relative permittivity respectively. These parameters have always been observed isolated...
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