Granular filters for marine structures: Knowledge generation for filter stability analysis and design

颗粒过滤器广泛应用于海洋建筑，包括护岸和防海床冲刷。需要这些过滤器来防止下面的土层通过保护层的孔隙结构被冲走。由于缺乏对液压滤水器稳定性的基本认识，海洋结构物的破坏往往是由滤水器的失效引起的。颗粒过滤器在垂直振荡流作用下的水力稳定性的测定是最大的挑战之一。因此，拟议研究的总体目标是发展过滤器设计的科学知识。为此目的，提出的理论/数值和实验研究旨在：(i)确定水文-岩土过程（ii）描述水力梯度、孔隙压力和剪切应力，诱导基底和过滤材料的初始运动和运输（iii）开发波浪荷载作用下颗粒过滤器水力稳定性的预测公式。

Granular filters are applied for marine structures, including bank protection and protection against sea bed scour. These filters are required to prevent underlying soil layers from being washed out through the pore structure of the protective layers. Due to the lack of missing basic knowledge on hydraulic filter stability, the failures of marine structures have often been caused by the failure of filters. One of the biggest challenges is the determination of the hydraulic stability of granular filter subject to perpendicular oscillatory flow. The overall goal of the proposed research is therefore the development of scientific knowledge for filter design. For this purpose, the proposed theoretical/numerical and experimental investigations are aimed at: (i) determination of hydro-geotechnical processes (ii) description of hydraulic gradient, pore pressure and shear stress inducing incipient motion and transport of base and filter material (iii) development of prediction formulae for the hydraulic stability of granular filter subject to wave loads.