船行波作用下运河堤护面块体稳定性分析

Stability of canal embankment protection blocks under ship wave action

平陆运河城区段下游部分河道保留的河堤,具有断面小、护面块体质量轻等特点,运河通航后,在船行波频繁作用下,可能对坡面稳定性产生一定的影响。为分析船行波作用下现有护面块体的安全稳定性,利用三维图形软件构建典型河道和船体模型,通过数值模拟计算出不同船速条件下船行波产生的坡脚浪高值,确定其对应的块体稳定质量。结果表明:在设计高水位条件下,5000 DWT散货船的船速为3 m∕s时,产生的船行波能使嵌固性较差的护面块体产生失稳脱落的现象,建议该河段通航船速不宜大于4 m∕s。

The river embankments preserved in the lower reaches of the urban section of the Pinglu Canal have the characteristics of small cross-section and light mass of protection blocks.After the canal is navigable,under the frequent action of ship waves,it may have a certain impact on slope stability.To analyze the safety and stability of existing protection blocks under the action of ship waves,we build a typical river channel and ship model using 3D graphics software,calculate the slope toe wave height values generated by ship waves under different ship speed conditions through numerical simulation,and determine the corresponding stable mass of blocks.The results show that under the design high water level conditions,when the speed of the 5000 DWT bulk cargo ship is 3 m s,the generated ship waves can cause instability and detachment of the poorly embedded armor blocks.It is recommended that the navigable ship speed in this section should not exceed 4m s.