Cam-Clay plasticity, Part II: implicit integration of constitutive equation based a nonlinear elastic stress predictor

摘要: Abstract An improved stress integration algorithm for the modified Cam-Clay plasticity model capable of accounting nonlinear elasticity is proposed. The entails use secant elastic moduli integrating constitutive equation in conjunction with a fully implicit scheme calculating plastic strains. Numerical experiments demonstrate algorithm's good accuracy and stability under wide variety imposed strain paths. This should be useful situations dominated by combined unloading such as would occur tunneling excavations.