斜坡堤护面块体安放过程及稳定性数值模拟  

Numerical simulation of placement process and stability of armor units on rubble mound breakwater

作　　者：李绍武[1] 王家汉 柳叶 LI Shaowu;WANG Jiahan;LIU Ye(State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350

出　　处：《海洋工程》2022年第2期1-14,66,共15页The Ocean Engineering

摘　　要：利用基于光滑粒子流体动力学(SPH)数值方法的开源软件DualSPHysics进行数值试验,模拟斜坡式防波堤上扭王字护面块体的安放过程,研究护面块体的稳定性。首先以DualSPHysics为平台开发了护面块体的安放功能模块,并对护面块体的安放效果进行评价,实现了按指定安放密度进行块体安放。块体安放完成后,在数值波浪水槽中研究护面块体在规则波作用下的运动及受力响应,并分析护面块体失稳的典型形式和失稳标准,通过系统化的参数分析,探讨波浪要素及块体安放等因素对块体稳定性的影响。结果表明,扭王字块体稳定性系数的取值范围为21.64~26.20,是规范推荐值的1.5倍左右。块体鼻轴方向的相对位置主要影响单个块体的上举脱出失稳,鼻轴方向在坡面上赤平投影图越分散,护面块体层整体上越稳定。坡面坡度变缓时,护面块体层整体下滑趋势减弱,但更易发生上举脱出失稳;单个块体缺失会加大周围块体的上举失稳概率。Numerical experiments were carried out using the open-source SPH software DualSPHysics to study the placement and stability of accropode armor blocks on rubble mound breakwater.Based on the existing open source SPH software DualSPHysics,a module with function of armor block placing was developed,and the placement effect of armor block was evaluated.Armor blocks can be placed according to a prescribed placement density.After the block placement was finished,the motion and forcing response of the armor blocks under regular wave action were studied in a numerical wave flume.The typical instability forms and instability criteria of armor blocks were analyzed,and the influence of waves and block placement on block stability was discussed through systematic parameter analysis.The results show that the range of stability coefficient value is 21.64~26.20,which is about 1.5 times the recommended value.The relative position of the nasal axis mainly affects the lifting-out instability of a single block.The more scattered the stereographic projection of the nose axis of the blocks on the slope,the more stable the blocks are.When the slope becomes gentler,the overall downward sliding trend of the armour block layer is alleviated,but lifting-out instability may be aggravated.The missing of an individual block will increase the probability of the lifting-out instability of the blocks around it.

关 键 词：DualSPHysics模型 扭王字块体 安放 块体稳定性 防波堤 

分 类 号：TV139.2[水利工程—水力学及河流动力学]