Evolution of Strength Parameters for Sandstone Specimens during Triaxial Compression Tests

Table 5

Conversion relationships between the strength parameters of the Mohr–Coulomb criterion and those of the Drucker–Prager criterion.

No.		k	Note	Originate
1			Drucker–Prager cone coincides with the outer vertices of the Mohr–Coulomb hexagon	Chen and Saleeb [41]; Chen and Liu [40]; Davis and Selvadurai [43]; McLean and Addis [55]
2			Drucker–Prager cone coincides with the inner vertices of the Mohr–Coulomb hexagon	Chen and Saleeb [41]; Chen and Liu [40]; Davis and Selvadurai [43]; McLean and Addis [55]; Vee [56]
3			Drucker–Prager cone inscribes with the outer vertices of the Mohr–Coulomb hexagon	Zheng et al. [44]; Chen and Liu [40]; Alejano and Bobet [14]
4			Average value of case 1 and case 2	Zhang [17]
5			On the plane, the area of the Drucker–Prager circle equals the area of the Mohr–Coulomb hexagon.	Liu et al. [57]; Chu and Xu [42]