Porous Models for Wave-seabed Interactions

Abstract

In this chapter, the background and importance of marine geotechnics with an emphasis on the phenomenon of wave-seabed interactions and its application are outlined. Several hot topics in this area are also suggested for future research development.

Pipeline–Seabed Interaction

“…However, also 825 waves can cause liquefaction as detailed in two recent books by Jeng (2013) and Sumer (2014). In the wave 826 case, the cyclic variation in shear stresses in the soil is caused by the pressure variation along the seabed 827 36 from the migrating surface waves (positive pressure under the crest where the water depth is large and 828 negative pressure under the trough).…”

Some Effects of Intrinsic Cyclic Loading in Saturated Sands

“…Such a mechanism appears in marine engineering, when changes in pore pressures are caused by water waves, see Jeng (2013). A different mechanism of pore-pressure changes occurs in most geotechnical problems in which the changes are caused by external excitations, such as earthquakes, machine vibrations, traffic, etc.…”

“…In order to describe this phenomenon, they use various classical models of porous media, which however lead to different results. A short state-of-the-art is presented in Sawicki and Mierczyński (2006), see also Jeng (2013). The classical standard in marine engineering was established by Yamamoto et al (1978).…”

Acceleration Mechanism of Void Development in Concrete Riprap Seawalls

“…As soil grains and water are incompressible comparing with the air, putting more air will increase the overall compressibility of the soil medium. Previous studies on wave-induced soil response (Jeng 2013, Sumer 2014 reveal that the pressure response is getting poorer when the compressibility increases. It is because the pressure on the soil surface dissipates rather rapidly near the upper region of soil because air mitigates the pressure by expansion or contraction.…”