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

颗粒过滤器应用于海洋结构，包括护岸和防止海床冲刷。需要这些过滤器来防止下面的土壤层通过保护层的孔隙结构被冲洗掉。由于缺乏对水力过滤器稳定性的基本认识，海洋结构物的失效往往是由过滤器失效引起的。其中最大的挑战之一是确定颗粒过滤器受到垂直振荡流的水力稳定性。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，建议的理论/数值和实验研究的目的是：（一）确定水文岩土过程（二）水力梯度，孔隙压力和剪切应力诱导的初始运动和运输的基础和过滤材料的描述（三）发展预测公式的水力稳定性颗粒过滤器受到波浪载荷。

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.