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http://dx.doi.org/10.12989/gae.2021.27.5.447

Seismic behavior of caisson-type gravity quay wall renovated by rubble mound grouting and deepening  

Kim, Young-Sang (Department of Civil Engineering, Chonnam National University)
Nguyen, Anh-Dan (Department of Architecture and Civil Engineering, Graduate school, Chonnam National University)
Kang, Gyeong-O (Department of Civil Engineering, Gwangju University)
Publication Information
Geomechanics and Engineering / v.27, no.5, 2021 , pp. 447-463 More about this Journal
Abstract
Caisson-type structures are widely used as quay walls in coastal areas. In Korea, for a long time, many caisson-type quay walls have been constructed with a low front water depth. These facilities can no longer meet the requirements of current development. This study developed a new technology for deepening existing caisson-type quay walls using grouting and rubble mound excavation to economically reuse them. With this technology, quay walls could be renovated by injecting grout into the rubble mound beneath the front toe of the caisson to secure its structure. Subsequently, a portion of the rubble mound was excavated to increase the front water depth. This paper reports the results of an investigation of the seismic behavior of a renovated quay wall in comparison to that of an existing quay wall using centrifuge tests and numerical simulations. Two centrifuge model tests at a scale of 1/120 were conducted on the quay walls before and after renovation. During the experiments, the displacements, accelerations, and earth pressures were measured under five consecutive earthquake input motions with increasing magnitudes. In addition, systematic numerical analyses of the centrifuge model tests were also conducted with the PLAXIS 2D finite element (FE) program using a nonlinear elastoplastic constitutive model. The displacements of the caisson, response accelerations, deformed shape of the quay wall, and earth pressures were investigated in detail based on a comparison of the numerical and experimental results. The results demonstrated that the motion of the caisson changed after renovation, and its displacement decreased significantly. The comparison between the FE models and centrifuge test results showed good agreement. This indicated that renovation was technically feasible, and it could be considered to study further by testbed before applying in practice.
Keywords
caisson-type gravity quay wall; centrifuge model test; deepening; numerical simulation; renovated quay wall;
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