The spectral analysis of surface wave (SASW) was introduced in the 1980s and it has since attracted the attention of researchers because it is a fast, inexpensive, non-destructive, and easy-to-use method for rock mass characterization. The SASW method was applied in excavation classification by Suharsono (2006) as well as in rock quality designation (RQD) determination (Suharsono et al., 2004); determination of flexible pavement and rigid pavement profiles (Ismail et al., 2001); and non-destructive evaluation and characterization of pavement systems (Nazarian and Stokoe, 1984). The aims of this article were to determine the RQD value...

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