波浪作用下非均质各向异性海床响应的数值模拟

Numerical Simulation of Wave-Induced Response of Inhomogeneous and Anisotropic Seabed

波浪作用下真实海床动力响应的研究具有重要的工程意义,为此,基于Biot固结理论建立了波浪作用下海床动力响应的二维有限元数值模型,并通过试验和解析解验证了模型的合理性．针对非均质各向异性海床,通过具体的数值计算分析了土的渗透系数与剪切模量连续变化时对海床孔隙水压力与有效应力的影响．结果表明,在土体其他条件保持不变时,波浪引起的海床响应对透水性各向异性不是很敏感;而海床的非均匀性对砂质底床的孔隙水压力和有效应力的影响显著．

The dynamic response of the real seabed is very important in coastal engineering. Based on Biot＇s consolidation theory, a two-dimensional model for computation of the seabed response due to waves is presented with the finite element numerical method. Comparisons among analytical, experimental and computational re- sults show that the poro-elastic theory is valid and feasible for sandy seabed. According to the numerical model, the effects of variable soil permeability and shear modulus on pore pressure and effective stress are discussed, namely the wave-induced dynamic response of inhomogeneous and anisotropic seabed is simulated. The numeri- cal results indicate that the wave-induced soil response is insensitive to the variations in hydraulieal anisotropy; however, the effects of inhomogeneous of seabed on pore pressure and effective stress are significant, especially in a sandy seabed.