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In this theoretical study, the strength parameters of the Drucker-Prager yield criterion and Mohr-Coulomb yield criterion were set to equal values, in order to analyze the correlation among the parameters. The Drucker-Prager strength parameters  and  were represented by the Mohr-Coulomb strength parameters  and . Specifically it can be seen that  is function of ,  and  is function of  alone. Drucker-Prager strength parameter  increases as the internal friction angle of soil increases.  which is the average of  and  was proportional to internal friction angle in which  and  are  values corresponding to the circles of the Drucker-Prager yield cirteria circumscribes and inscribes the Mohr-Coulomb yield criterion respectively. The values of the  was 0.07 and 0.29 which correspond to the internal friction angle of 10and 45respectively. In addition, value of  was proportional to internal friction angle of soil and the values of  1.12 and 1.62 which corresponds to internal friction angle of 10and 45respectively.The influence of the Mohr-Coulomb strength parameters on the Drucker-Prager strength parameter  was investigated and it was found that  was mainly influenced by the cohesion of the soil, except in the case of the minimum assumed value of  of 10kPa. The deviator stresses,  and , which correspond to the cases of the Mohr-Coulomb yield criterion under uniaxial compression and uniaxial tension, respectively, and , which is the average value of  and , decrease as the internal friction angle increases. Furthermore, the hexagon, which represents the Mohr-Coulomb yield locus, becomes more irregular, and the deviations of  and  from  also increase, as the internal friction angle increases.

A Study on Comparison of Strength Parameters of Hydrostatic Pressure-Dependent Yield Criteria