| A lot of mechanical work usually leads to soil compaction increase and crop production failure in the land consolidation and reclamation projects. Ground penetrating radar (GPR) detection, as one of the nondestructive detection methods, is imminent for soil compaction study. Under unsaturated moisture conditions, soil compaction was studied with frequency of 500MHz and 250MHz. Two factors, soil bulk density and penetration resistance, were selected to reflect soil compaction status. The interaction with soil water, organic matter, soluble salts and clay particles finally changed the propagation velocity of radar wave and dielectric constant of soil. The correlation was analized among five soil major characteristics, electromagnetic wave propagation characteristics and media relative dielectric constant. With radar wave velocity and amplitude, methematical models were constructed to calculate soil bulk density, digital compaction meter data and soil relative dielectric constant. Meanwhile, the combination with resistivity meter can improve the dectection accuracy and help analyze the attenuation coefficient of electromagnetic wave. All in all, soil compaction detection with GPR is novel, feasible and accurate.
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