EFFECT OF EXISTING STRUCTURE MODELING IN SEISMIC RESPONSE ANALYSIS OF AN IMPROVED AND DEEPENED GRAVITY-TYPE QUAY WALL BY SHEET PILES WITH ANCHOR PILES

Abstract

 In this study, the effect of omitting the existing caisson and its construction process to simplify the seismic response analysis by FEM is investigated for an improved and deepened gravity-type quay wall by sheet piles with anchor piles. In the omission of the construction process of the existing gravity-type quay wall, stress transfer to the seabed at the time of caisson installation cannot be evaluated, and the confining pressure of the seabed in front of the sheet pile after deepening improvement was evaluated as small. The influence of the omission of the construction process was not small since the overall displacement behavior of the deepened quay wall was evaluated as larger due to the smaller seabed resistance against the displacement of the sheet pile. In the case of omitting the modeling of the existing caisson, the locally large earth pressure on the sheet pile near the caisson bottom is no longer represented, and the bending deformation of the sheet pile was evaluated to be smaller.