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Abstract
A parametric study, based on numerical analysis, is carried out to study six different techniques to rehabilitate and enhance performance of existing anchored sheet¬pile quay walls under additIOnal live loads and/or greater exposed height. The rehabilitation techniques are; installing additional anchor or tie-back behind original anchor, installing additional tie-back at a different level of anchorage, installing additional sheet-pile wall either in front of or behind original sheet-pile wall, and installing a row of piles behind original sheet-pile wall. The study is performed on an anchored sheet-pile wall designed via limit equilibrium approach, using a specially developed software package S.P.D., and subjected to predefined working conditions. The conditions are then altered and the enhancement techniques are considered and studied by utilizing elastic¬perfectly plastic 2D finite element software according to Mohr-Coulomb criterion of failure using the commercial software package PLAXIS version 7.2, considering staged construction scenarios. The conducted parametric study singles out independent variables, that describe geometry of each enhancement, and studies each variable’s effect, individually, on five wall response variables that describe the original wall behavior after enhancement. Multiple regression analysis was employed to yield empirical equations for preliminary calculation of the previously mentioned response variables namely; factor of safety of soil-structure system, maximum bending moment resulting in original sheet-pile, force induced in original anchor, maximum vertical displacement of landline, and maximum horizontal displacement of sheet-pile wall exposed face for all the proposed enhancement techniques. The study also shows the effect of properties of enhancement components for each enhancement case. Finally, an evaluation of the proposed enhancements is presented.