护坡垫层渗透系数对面层波浪上举力的影响

Impact of revetment filer layer's permeability coefficient on wave uplift force acting on top layer

在工程应用中,对于波浪作用下的护岸工程,护坡通常采用面层-垫层-堤心土的设计模式,其垫层一般采用反滤层结构。但在实际工程中垫层结构往往被简化,直接将土工布铺设在砂层上。通过理论分析和模型试验,主要针对这种垫层结构在波浪作用下所受的影响进行了研究,得出了结论:当面层渗透系数小于垫层渗透系数时,在垫层内部会产生对面层的上举力,从而可能引起面层失稳。该成果对类似工程有一定的借鉴作用。

In engineering applications,for the revetment engineering under the wave action,the surface layerfiler layer-subsoil design patterns are usually used for the slope protection with a filter layer structure as the cushion; but in the practical project,the cushion structure is often simplified,with the geotextiles directly laid on the sand. Based on the theoretical analysis and model test,we study the impact of the cushion structure under the wave action,and comes to the conclusion that when the top layer＇s permeability coefficient is less than that of the filer layer,the uplift force acting on the top layer will be generated inside the filer layer,which may lead to the instability of top layer. The results may serve as reference for the similar engineering.