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直立式防波堤可因堤前海底被冲刷的影响而发生破坏。过去对于在立波作用下的直立堤,一般认为由于在堤前四分之一波长,即波节点处发生最大底流速,将引起海底泥沙的被冲刷,因此要求堤前护底块石层的宽度采用为1/4～3/8倍设计波长。然而一些模型试验表明,冲刷并不一定发生在节点位置。而且我们认为即使是在节点发生冲刷的情况下,也不应当简单地规定必须防止在第一个节点处形成冲刷坑。在确定直立堤前的护底措施时,应当首先判断冲刷坑可能发生的位置,估计冲刷坑的深度及大小,然后在地基整体稳定计算(如圆弧滑动方法)中,具体考虑存在冲刷坑后对稳定安
Upright breakwater can be damaged due to the scouring effect of the seafloor. In the past, in the case of vertical embankments under the action of standing waves, it is generally considered that due to the fact that the maximum bottom flow velocity at the wave nodes occurs at the quarter wavelength before the embankment, the sediment of the seafloor will be washed away. Therefore, The width is 1/4 ~ 3/8 times the design wavelength. However, some model tests show that erosion does not necessarily occur at the node location. And we think that even in the case of erosion of nodes, it should not be simply stipulated that scouring pits must be prevented from forming at the first node. In determining the measures to protect the bottom of the upright embankment, it is first necessary to determine the possible location of the scour pit and estimate the depth and size of the scour pit. Then, in the overall stability calculation of the foundation (such as the arc sliding method), the existence of the scour pit To stability and security