Short-term stability of reinforced embankment over clayey foundation.

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  • Short-Term Stability of Reinforced Emba

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Stability against deep-seated failure of an embankment over soft clayey foundation is minimal at the end of construction. Since this stability increases as the foundation consolidates, related design is controlled by short term constraints. Stability can be enhanced by using a reinforcing agent capable of carrying tensile force. Ideally, the reinforcement will bridge over a temporary unstable situation until the structure has gained the strength needed to ensure stability over the long-run. Consequently, an efficient and possibly economical structure is produced.To analyze the stability effect of the reinforcement at the end of construction, a rotational failure mechanism is assumed. This mechanism allows the embankment to break rather steeply and enables the foundation to be squeezed out. The moment limiting-equilibrium equation is assembled rigorously for the assumed mechanism. The problem then is stated as a search for the required reinforcement tensile resistance so that specified safety factors with respect to the shear strength of the soils are exceeded while satisfying the moment equation. A computational scheme which follows the statement of the problem is introduced.Nondimensional design charts, which provide an insight into the reinforcement effects, are presented. Results indicate that reinforcement has the potential to be effective only when the extent of the soft foundation is limited as compared to the embankment dimensions.

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