The soil permeability of many natural marine sediments decreases with depth because of consolidation under overburden pressure. This is accompanied by a decrease in porosity and void ratio that also affect the permeability. Conventional theories for wave-induced soil response have assumed a homogeneous porous seabed. This paper presents a new approach for the wave-induced response in a soil matrix, with variable permeability as a function of burial depth. The soil matrix considered is unsaturated and anisotropic, and is subject to a three-dimensional wave system. The pore pressure and effective stresses induced by such a system are obtained from a set of equations incorporating a variable permeability. Verificationia available through reduction to the simple case of uniform permeability. The results indicate that the effect of variable soil permeability on pore pressure and vertical effective stress may be significant, especially in a gravelled seabed and for unsaturated sandy soils.
Transient soil response in a porous seabed with variable permeability
Das transiente Verhalten des porösen Meeresbodens mit variabler Durchlässigkeit
Ocean Engineering ; 23 , 1 ; 27-46
1996
20 Seiten, 6 Bilder, 1 Tabelle, 26 Quellen
Aufsatz (Zeitschrift)
Englisch
Meeresboden , Porosität , Durchlässigkeit , Variable , transienter Zustand , Ablagerung , Bodenmechanik , Bodenverfestigung , Wasserdruck , Wasserwelle , Tiefe (geometrische Größe) , Schwingungsverhalten , Innendruck , Sand , Frequenz , Wellenlänge , Verlagerung , Anisotropie , Normalspannung (mechanisch) , mathematisches Modell , Differenzialgleichung , lineare Gleichung , Scherspannung , Integralgleichung , Druckverteilung
The effects of variable permeability on the wave-induced seabed response
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