Research Information System
Environmental Earth Sciences, vol.84, no.16, 2025 (SCI-Expanded)
The Standard Penetration Test (SPT) and Shear Wave Velocity (Vs) determination are widely used in foundation research analysis. Recently, the Menard Pressuremeter Test (MPT) has also been used. There are numerous empirical equations determining Vs from SPT blow counts. However, no empirical equations predict Vs, based on the MPT results in the literature. Ten boreholes were drilled in this study. 143 SPT, 143 MPT and 143 Vs determination tests were carried out. 11 empirical equations are proposed in this study. 67 empirical equation predicting Vs are compiled from literature. The performance of these equations is tested with SPT blow counts of this study. R2 determined from equations compiled from the literature are very close to each other. In addition to this, VAF, RMSE and MAPE values of all empirical equations are insufficient to determine the best predictive empirical equations. The scaled percent error-cumulative frequency chart and all equations' scaled percent error indices were calculated. Equation 4 (this study), Eq. 16 (this study), Eq. 20 (this study), Ohsaki and Iwasaki (Soils Found 13:61–73, 1973), Seed et al. (J Geotech Eng ASCE 109:458–482, 1983), Lee (J Chin Inst Eng 13:519–532, (1990), İyisan (1996) and Daag et al. (Philippines Appl Sci 12:8067, (2022) exhibit significant prediction with 32 scaled percent error indice. The R2 and scaled percent indices of the empirical equations (Eq. 7 and Eq. 8) proposed with the pressuremeter modulus and limit pressure data are determined as 0.51, 0.43, 36 and 37, respectively. The prediction equations proposed in this study are developed with a limited number of data. For this reason, a cross-check should be applied before using these empirical equations for design purposes.