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针对埋设有海底管线的多孔介质海床,基于Biot动力固结理论,采用Pastor-Zienkiewicz III的动力弹塑性本构模型,建立了一个多孔介质的弹塑性海床模型,分析了波浪-海流共同作用下海底管线周围海床的动力响应规律,计算了波浪-海流共同作用下海床中超孔隙水压力的分布和表面波压力的分布规律,以及不同的海流速度对海床中超孔隙水压力分布的影响。结果表明:海流的存在对海床表面的波压力的波长和周期都有显著影响;海底管线等结构物的存在,减缓了管线以下海床中超孔隙水压力的累积。
Based on the Biot dynamic consolidation theory and the dynamic elasto-plastic constitutive model of Pastor-Zienkiewicz III, a porous media seabed model is constructed for the porous media seabed buried in submarine pipelines. Under the combined action of waves and currents, the distribution of excess pore water pressure and the surface pressure distribution in the seabed are calculated. The influence of different ocean currents on the distribution of excess pore water pressure in the seabed is calculated. The results show that the presence of ocean current has a significant effect on the wavelength and period of wave pressure on the surface of the seafloor. The existence of submarine pipeline and other structures slows the accumulation of excess pore water pressure in the sea floor below the pipeline.