Study on the deformation behavior of subgrade embankments on inclined weak foundation

Based on the shear strength reduction FEM,deformation behavior of subgrade embankments on inclined weak foundation is studied.It is shown that the vertical settlements and the lateral deformation of embankment on horizontal weak foundation are symmetrically distributed along central axis,while that of inclined weak foundation is distributed inclined to the lower toe of embankment,indicating that the inclination of foundation has great influence on the distribution of lateral deformation specially.Stability of embankment decreases with increasing construction height of embankment,which get minimal value at the end of construction.On the same conditions,the stability of embankment on inclined weak foundation is obviously smaller than that of embankment on horizontal weak foundation.The results also show that the failure of embankment may occurr along the inclined surface of inclined weak foundation,different from the failure of embankment on horizontal foundation.The results also indicate that,if necessary,reinforcement should be laid out at lower toe of embankment on inclined weak foundation,where lateral deformation or incremental displacement vectors get its maximal value.