3D models for wave-induced pore pressures near breakwater heads
3D models for wave-induced pore pressures near breakwater heads
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DOI：
10.1007/s00707-010-0303-z
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发表时间：
2010-12-01
期刊：
影响因子：
2.7
通讯作者：
Ou, J.
中科院分区：
文献类型：
--
作者：
Jeng, D. -S.;Ou, J.
波浪引起的孔隙压力是海岸结构周围地基稳定性分析的重要因素之一。防波堤头周围波浪引起的海底响应的现有模型仅限于多孔弹性土壤行为以及超孔隙水压力上升的解耦振荡和残余机制。为了克服现有模型的缺点，本研究建立了一种新的三维多孔弹塑性模型，该模型可以同时模拟振荡机制和残余机制。所提出模型的简化情况通过现有的 2D 实验数据和防波堤前的 3D 孔隙弹性分析解决方案进行了验证。利用所提出的新模型，进行了参数研究，以研究波致孔隙压力和液化与孔隙弹性和孔隙弹塑性模型预测的相对差异。根据数值算例，可以得出结论，弹性模型和弹塑性模型之间的相对差异受波浪周期和水深的影响显着。波高显着影响残余孔隙压力随时间的变化。塑性土壤行为在低渗透性海底中起着重要作用。塑性土行为对波致残余孔隙压力的影响比振荡孔隙压力的幅度更显着。此外，孔隙弹性分析往往会低估防波堤头周围液化区域的大小。
Wave-induced pore pressure is one of the important factors in the analysis of foundation stability around coastal structures. Existing models for the wave-induced seabed response around breakwater heads have been limited to poro-elastic soil behavior and de-coupled oscillatory and residual mechanisms for the rise in excess pore water pressure. To overcome the shortcoming of the existing models, in this study a new three-dimensional poro-elastoplastic model is established, in which both oscillatory and residual mechanisms can be simulated simultaneously. The reduced cases of the proposed model are verified with existing 2D experimental data available and a 3D poro-elastic analytical solution in front of a breakwater. With the proposed new model, a parametric study is conducted to investigate the relative differences of the predictions of the wave-induced pore pressure and liquefaction with poro-elastic and poro-elasto-plastic models. Based on numerical examples, it can be concluded that relative differences between elastic and elasto-plastic models are significantly affected by wave periods and water depths. Wave height significantly affects the development of residual pore pressure versus time. Plastic soil behavior plays an important role in a seabed of low permeability. Plastic soil behavior has more significant influence on wave-induced residual pore pressure than the amplitude of the oscillating pore pressure. Furthermore, poro-elastic analysis tends to under-estimate the size of the liquefaction regions around breakwater heads.