动水压力作用下堤防边坡流固耦合渗流特性研究  

Study on the fluid-solid coupling seepage characteristics of slope protection under hydrodynamic pressures

作　　者：吴勇 黄江华 左思贤 WU Yong;HUANG Jiang-hua;ZUO Si-xian(Zhejiang East China Engineering Safety Technology Co.,Ltd.,Hangzhou 310014,China;School of Water Environment,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]浙江华东工程安全技术有限公司,杭州310014 [2]郑州大学水利与环境学院,郑州450001

出　　处：《水道港口》2019年第6期724-729,共6页Journal of Waterway and Harbor

基　　金：水利部堤防与病害防治工程技术研究中心资助(201409)

摘　　要：将堤防边坡土体简化为由固体土骨架和水组成的饱和介质,考虑动水压力引起的土骨架体积应变,引入堤防边坡土体孔隙率和渗透率的动态变化表达式,运用饱和土力学和流体力学理论构建了动水压力作用下堤防边坡的流固耦合渗流方程。选取某堤防边坡工程实例,借助COMSOL软件进行了数值模拟。研究结果表明:动水压力会引起固体土骨架的压缩变形,土的孔隙率提高,流水的渗流路径较远,在堤防边坡设计和研究时应充分考虑孔隙水渗流压力引起的体积变形;堤防边坡的沉降主要发生在临水边坡一侧,渗流作用引起的边坡沉降较小。The embankment slope soil was simplified as a saturated medium composed of solid soil skeleton and water,and the volumetric strain of the soil skeleton caused by dynamic pressures was considered.The dynamic variation expressions of the soil porosity and permeability of the embankment slope were introduced,and the fluid-solid coupling seepage equation about embankment slope under dynamic pressure was finally established based on the theory of saturated soil mechanics and hydromechanics.One embankment slope was selected as an engineering example,and it was simulated with COMSOL software.The numerical results show that:the compression deformation of the solid soil skeleton is caused by dynamic water pressure.The porosity of the soil is relatively increased,and the seepage path of the flowing water would be farther away,so the volume deformation caused by the pore water seepage pressure should be fully considered in the design and research of the embankment slope;the sediments of embankment slope mainly occurs on the water-facing side,and the settlement caused by seepage is relatively small.

关 键 词：动水压力 堤防 流固耦合 运动变形 数值模拟 

分 类 号：U656[交通运输工程—港口、海岸及近海工程] TU435[交通运输工程—船舶与海洋工程]