Effects of the fluid-solid interface conditions on the dynamic responses of the saturated seabed during earthquakes
Effects of the fluid-solid interface conditions on the dynamic responses of the saturated seabed during earthquakes
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流固界面条件对饱和海底地震动力响应的影响
DOI：
10.1016/j.soildyn.2022.107728
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发表时间：
2023-02
影响因子：
4
通讯作者：
Jing Liping
中科院分区：
文献类型：
--
作者：
Li Jinkai;Shan Zhendong;Li Tengda;Jing Liping
本文研究了地震期间海水与海底之间的流固界面条件对海底动力响应的影响。基于Biot多孔介质理论，分别给出了不同流固界面条件下饱和海底一维瞬态响应的半解析解和一维稳态响应的解析解。基于瞬态响应解，发现流固界面条件对慢波影响较大，对快波影响较小。基于稳态响应解，发现不同入射波频率下，流固界面条件对位移放大系数和孔隙水压力的影响不同。在低频区，界面磁导率越低，位移放大系数越小。在高频区，界面磁导率越低，位移放大系数越大。此外，流固界面条件不同程度地影响不同渗透系数海底的动力响应。随着海底渗透系数的减小，流固界面条件对海底动力响应的影响逐渐减小。
In this paper, the effects of the fluid-solid interface conditions between seawater and seabed on the dynamic responses of the seabed during earthquakes are investigated. Based on Biot's porous media theory, a semi-analytical solution of the 1D transient response and an analytical solution of the 1D steady-state response of the saturated seabed under different fluid-solid interface conditions are given, respectively. Based on the transient response solution, it is found that the fluid-solid interface conditions have a significant effect on slow waves and a small effect on fast waves. Based on the steady-state response solution, it is found that the effects of the fluid-solid interface conditions on the displacement amplification factor and pore-water pressure vary under different incident wave frequencies. In the low-frequency region, the lower the interface permeability, the smaller the displacement amplification factor. In the high-frequency region, the lower the interface permeability, the larger the displacement amplification factor. Moreover, the fluid-solid interface conditions affect the dynamic response of the seabed with different permeability coefficients to different degrees. As the seabed permeability coefficient decreases, the effects of the fluid-solid interface conditions on the dynamic responses of the seabed gradually decrease.
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