DEFORMATION ANALYSIS AND BEARING CAPACITY OF A TWO-LAYERED SOIL DEPOSIT WITH A SURFACE CRUST CONSIDERING COUPLE STRESSES

抄録

This paper provides a numerical analysis of the bearing capacity of a two-layered soil deposit : a crust on saturated soft clay. The surface crust is modeled as a Cosserat medium, considering couple stresses for the bending deformation, and the underlying clay layer is treated as an elasto-plastic material. The formulation of the Cosserat-FE for the two phase media is presented briefly, and a numerical comparison between the Cosserat and an ordinary continuum, for the example of a simple beam, demonstrates the effect of couple stresses. Asaoka's method allows us to predict the bearing capacity of such two-layered deposits by considering the settlement or horizontal deformation beneath the embankment. The numerical results are then discussed.