波浪作用下弹性海床孔隙水应力响应的数值模拟

Numerical Simulation of Pore Water Pressure Response of Elastic Seabed Under Wave Loading

基于二维动力Biot固结理论,描述了海床土骨架的应力、应变和时间的本构关系,从Galerkin加权余量法出发建立了以土骨架位移u和孔隙水压力p表达的u-p形式的有限元方程,并采Wilson-θ直接数值积分法求解时域内动力方程。数值计算结果表明,在波浪作用下,海床孔隙水压力的计算值与实测值基本吻合,用文中的理论计算模型描述沙床对波浪荷载的响应是可靠的。

Topic of wave-induced dynamic response on seabed is important for civil engineers.Based on two-dimensional Biot's theory of dynamic consolidation,the u-p finite element formulations for dynamics of seabed under wave loading are derived by applying Galerkin weighted-residual procedure,where u is the displacement of soil matrix and p is the pressure of porous fluid.The governing equations are numerical solved by Wilson-θ time integration scheme.Numerical analysis show that numerical results are consistent with the experimental results and the numerical methods is credible.