Constitutive modelling of Roller Compacted Concrete

Although the use of simple failure criterion such as Mohr-Coulomb, in the numerical analysis and design of Roller Compacted Concrete (RCC) dams may be instructive, but by no means suffices. Therefore it seems right to seek a constitutive model more capable of capturing the true behavioral pattern of RCC material. On the other hand such comprehensive models have proven too tedious to be accepted readily by the industry. It is thus proposed here to employ the four parameter Hsieh-Ting-Chen (1982) criterion, calibrated with the published experimental data on RCC by Peng et al. (1997). Having attained the basic criterion, the Mohr-Coulomb parameters are evaluated at various mean pressures for a constant value of Lode's angle (0), which corresponds with the stress path of tri-axial compression test. Thereby an exponential relationship is evaluated between the angle of internal friction and mean pressure, normalized with uni-axial compressive strength (f(c)) of the material.