The effect of berms and tension cracks on the maximum reinforcement force in embankments on soft soils

Abstract

The rotational stability of reinforced embankments on soft soils is usually investigated by a total stress analysis using a limit equilibrium approach, assuming a circular slip surface. Solutions are presented in the paper from which the location of the critical slip circle and the maximum required reinforcement force can be calculated directly for a given limiting tangent. In the first part of the paper, the circular failure plane has been assumed to pass through the foundation soil and the embankment. The second part of the paper considers the presence of a full-height dry tension crack in the embankment. Using the solutions, the effect of berms and of tension cracks on the maximum required reinforcement force can be evaluated quantitatively. The optimum combination of the reinforcement and the dimensions of the berms can be chosen.