Abstract:

According to a lot of results based on the static and cyclic triaxial test, an equivalent visco-plastic model basing on shakedown theory was proposed to precisely and efficiently model the cumulative deformation of silty sands. The twosurface plastic model can reflect complex deformation features with strain hardening and shear dilatancy. In order to improve the efficiency of the integral step, a fully implicit Euler backward algorithm can be adopted to update non-linear equations. By modeling cyclic test results, the proposed model was verified to be good with better predictions and efficiency. And the integral step could be  freely selected  to obtain high computation efficiency. Finally, the model was embedded in the code of  finite element(FEM) to simulate the uneven deformation of the practical boundary problem under long term traffic loading.

Key words:  traffic loading, silty sands, cumulative deformation; , equivalent visco-plastic model, numerical integration, finite element code