Abstract: When there are signs of failure due to the excessive deformation on a retaining wall, it is necessary to determine its stability state and whether the retaining wall worth to have it rehabilitated or not. The retaining wall rehabilitation design should consider the residual effective resistance of the original retaining wall, the cost effectiveness and safety of the new rehabilitated retaining wall. A viable method is to qualitatively and quantitatively determine the stability of existing retaining walls throughout comprehensive investigations. By estimating the residual effective resistance of the retaining wall, the effective resistance required by the new supporting structure can be determined. Considering engineering geological environment, hydrogeological conditions and site spatial conditions, an optimal rehabilitation method can be selected.

Key words: Existing Retaining Walls, Residual Effective Resistances, Rehabilitation Design