Research Article
Discussion on the Theoretical Basis for Cross-Over Method Applied to Downhole Wave Velocity Test
Figure 1
Downhole method. (a) Schematic of the downhole velocity test method with the surface plank source. (b) Signal traces recorded at different testing depth by the downhole method at a site in Beijing. (c) 3D numerical analysis model of size 16 m 16 m 25 m.
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