某护岸结构破坏原因分析及修复设计

通过物理模型试验,研究某护岸前部开挖港池对护岸稳定的影响。结果表明:港池开挖前后,6 t扭王字块体和胸墙均失稳,胸墙后部冲刷严重,堤脚附近波高增减幅度约2%,胸墙后越浪量增减幅度约9%。开挖港池后护底块石轻微变形,但不是引起护岸破坏的直接原因。护岸破坏的直接原因是胸墙顶高程偏低,越浪水体在胸墙后产生较大冲刷坑,引起胸墙失稳,从而导致护岸结构破坏。综合考虑护岸、码头和取水口头部的关系,得出了护岸修复断面图,经过物理模型试验的验证,修复断面安全可靠,并已应用于工程实践。

Cause of structural damage and repair design of revetment

This paper analyzes the influence of harbor basin excavation near revetment on the stability of revetment based on the physical model test.The results show that:before and after the excavation of the harbor basin,6 t Chinese accropode and breast wall are instable,the back of the breast wall scours seriously,the wave height increases or decreases about 2% near the toe,the overtopping volume increases or decreases about 9% behind the beast wall.The toe protection stone has slight deformation after excavation,but it is not the direct reason for the revetment damage.The direct reason is the low elevation at the top of the breast wall.Overtopping generates a large scour pit which leads to the unstability of the breast wall and the revetment structure damage.The repair section drawing is obtained according to the comprehensive consideration of the revetment,wharf and the intake head.The repair section is confirmed safe and reliable by the physical model test,and it has already applied to the engineering practice.