Frequency response analysis of concrete seawall including soil-structure-seawater interaction
Section snippets
Author contribution
Weiyun ChenZhicheng WangShaolin ChenJianjun MaYu Liang
Theoretical formulation
The problem under study is a water-structure-sediment-foundation-backfill system which is shown schematically in Fig. 1. A typical gravity seawall with top width B, height H and wall inclination θ rests on a foundation (subsoil). The wall retains a horizontal backfill at one side and a large volume of seawater at the other side, with alluvium or sediment deposited at the reservoir bottom. The depth of sediment is Hs and the depth of water on the seaward side is Hw. The foundation, sediment, and
Verification
As shown in Fig. 1, the perfectly matched layer (PML) [[27], [28], [29]] is used as an absorbing boundary condition to truncate the computational domain, absorbing all out-going waves. Before the numerical analysis, it is necessary to validate the effectiveness of the proposed PML. In subsection 3.1, the numerical examples only for the wave radiation problem are firstly presented to demonstrate the accuracy of the proposed PML. In subsection 3.2, further verification is presented for more
Numerical studies and discussions
Comprehensive analyses of various parameters of sediment, backfill, foundation, seawater and structure are presented in this section, from which the discussions are given to evaluate the main influencing factors on the seismic response of seawall. The top width of seawall B = 2 m, the wall height H = 10 m, and the wall inclination θ = 0°. The thickness of the foundation soil is assumed to be 20 m. The parameters for the two-phase porous materials at different domains in the model are given in
Conclusions
This paper establishes a frequency-domain numerical model to evaluate the seismic response of a water-structure-sediment-foundation-backfill coupling system with full consideration of interactions among different domains. The u-p formulation of Biot theory is adopted in modeling the fluid-saturated sediment, backfill, and foundation soil. The PML is used as an absorbing boundary condition to truncate the computational domain. After verifying the effectiveness of PML, the proposed model is used
Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgements
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 41877243and 41502285). Special thanks for professor Matteo Mori at Pisa University for his guidance on the numerical model.
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