FORWARD SIMULATION OF GROUND PENETRATING RADAR USED IN SOIL SUBGRADE VOID DETECTION UNDER CEMENT CONCRETE PAVEMENT'S SLAB

摘要

In this paper, the Two-Dimension Finite Difference Time Domain (2D-FDTD) equations of Ground Penetrating Radar (GPR) electromagnetic wave, which propagates in cement concrete pavement, is briefly established. And the electromagnetic wave of the air-coupled antenna GPR which propagates in the cement concrete pavements with soil subgrade void under cement concrete slab is simulated by using the 2D-FDFD method. The two kinds of GPR echo properties are further analyzed, one case is that the void is fully filled with water under the cement concrete slab, the other case is fully filled with air. The research lay a more important referred significance for using GPR to detect soil subgrade void under the cement concrete pavement's slab.