TẢI TRỌNG SÓNG TÁC ĐỘNG LÊN CẤU KIỆN TIÊU SÓNG TRỤ RỖNG TẠI ĐỈNH ĐÊ BIỂN THEO LÝ THUYẾT VÀ THỰC NGHIỆM

Abstract

Along the coast of Vietnam, there are many revetments of inclining slope type combined with top vertical seawall to reduce wave overtopping flow and the height of the revetments that lead to the decrease in investment. The structure of the top vertical seawall causes large reflected waves, creating large forces to the seawall and inclining slope. Based on these facts, the Research Team on "river bank and coast protection works" of Hydraulic Construction Institute proposed structures a wave dissipation structure of hollow cylinder type on the top of the sea dike which aims to dissipate the wave; reduce overtopping, embankment, and pressure on the slope that enhance the stability of the revetments. The hollow cylinder wave dissipation structure is arranged on the top of the sea-dike with the hollows on the seaside surface and made of high strength reinforced concrete. The structures are manufactured in the factory and assembled onsite, ensuring quality and shorter time of implementation. Experimental results show that the wave load acting on the wave dissipation structure of hollow cylinder type is similar to the analytical solution of Tanimoto in the case of the unbreaking wave. In respect of the breaking wave, the wave load computation cannot be applied by Tanimoto's solution.  In the same condition of the breaking wave at the gauges, the load acting on the wave dissipation structure is about 14 % of that acting on the vertical seawall.