波浪作用下半圆型防波堤及其地基动力响应的数值模拟  

Numerical simulation of dynamic responses of semi-circular breakwater and its foundation under wave action

作　　者：杨饯 王刚[1] Jian Yang;Gang Wang(School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《水动力学研究与进展（A辑）》2022年第4期582-589,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(52079012)。

摘　　要：防波堤和地基在波浪作用下的动力响应分析需要考虑波浪-海床地基-防波堤的相互作用。该文在通用数值分析软件ABAQUS的动力显式分析框架中,利用其自带的光滑粒子流体动力学(SPH)方法模拟波浪与海床地基和结构的相互作用,通过二次开发,引入了求解饱和土动力固结方程的位移-孔压耦合单元,模拟海床地基中超静孔隙水压力生成、扩散和消散过程,使得ABAQUS可以进行波浪-地基-结构的动力相互作用求解。并以长江口深水航道治理二期工程为例,建立了半圆型防波堤及其地基在波浪作用下动力响应的数值分析模型。首先,通过对室内模型试验的模拟对比,验证了数值模型的可靠性;然后,通过不同工况下的数值模拟计算,分析半圆型防波堤及地基动力响应的特点和规律。数值分析表明:防波堤受到的最大水平力和垂直力不会同时出现,存在一定的相位差;防波堤受到的波压力随水深的升高而减小,随波高的增大而增大;地基土体的超静孔压随着波高的增大而增大,随水深的升高而减小;防波堤的沉降随波高的增加而增大,随水深的升高而减小。The dynamic response analysis of breakwater and foundation under wave action needs to consider the wave-seabed foundation-breakwater interaction.In the dynamic explicit analysis framework of general numerical analysis software ABAQUS,the smooth particle hydrodynamics(SPH)method is used to simulate the interaction between waves and seabed foundation and structure.Through secondary development,the displacement-pore pressure coupling element is introduced to solve the dynamic consolidation equation of saturated soil.By simulating the generation,diffusion and dissipation of excess pore water pressure in seabed foundation,ABAQUS can solve the wave-ground-structure dynamic interaction.Taking the second phase of Yangtze Estuary deep water channel regulation project as an example,the numerical analysis model of dynamic response of semi-circular breakwater and foundation under wave action is established.Firstly,the reliability of the numerical model is verified by comparing the laboratory model test.Then,th e characteristics and rules of dynamic response of semi-circular breakwater and foundation are analyzed by numerical sim ulation under different working conditions.Numerical analysis shows that the maximum horizontal force and vertical force on br eakwater do not appear at the same time,and there is a certain phase difference.The wave pressure on breakwater decreases w ith the increase of water depth and increases with the increase of wave height.The excess pore pressure increases with the incr ease of wave height and decreases with the increase of water depth.The settlement of breakwater increases with the increase of wave height and decreases with the increase of water depth.

关 键 词：光滑粒子流体动力学方法 有限单元法 波浪 地基 半圆型防波堤 

分 类 号：TV139.2[水利工程—水力学及河流动力学] TU43[建筑科学—岩土工程]