Dielectric Characteristics of Unsaturated Loess and the Safety Detection of the Road Subgrade Based on GPR

Table 3

Reflection amplitude under different moisture contents on the loess interface.

	εr = 5	εr = 10	εr = 20	εr = 30	εr = 40	εr = 50
Amplitude maximum	124.37	173.19	214.77	235.61	248.89	258.37
Amplitude minimum	−212.89	−288.34	−351.61	−383.03	−402.97	−417.21