Influence of clay content on wave-induced liquefaction

V. S.Ozgur Kirca, B. Mutlu Sumer, Jørgen Fredsøe

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Özet

This paper presents the results of an experimental study of the influence of clay content (CC) on liquefaction of seabed beneath progressive waves. Experiments were, for the most part, conducted with silt and silt-clay mixtures; in supplementary tests, sand-clay mixtures were used. Two types of measurements were carried out: (1) pore-water pressure measurements across the soil depth and (2) water-surface elevation measurements. These measurements were synchronized with video recordings of the liquefaction process from the side. The ranges of the various quantities in the experiments were wave height H =7:6218:3 cm, wave period T =1:6 s, and water depth h=55 cm. The experiments showed that the influence ofCCon wave-induced liquefaction is very significant. Susceptibility of silt to liquefaction was increased with increasing CC up to CC≈30% (which is clay-specific), beyond which the mixture of silt and clay was not liquefied. Sand may become prone to liquefaction with the introduction of clay, contrary to the general perception that this type of sediment is normally liquefaction-resistant under waves. For instance, sand with d50 =0.4 mm was liquefied with CC=10.8%, whereas sand with d50=17 mmwas partially liquefied with CC as small as 2.9%. Remarks are made as to how to check for liquefaction of clayey soils exposed to waves in real-life situations. DOI: 10.1061/(ASCE)WW.1943-5460.0000249.

Orijinal dilİngilizce
Makale numarası05014002
DergiJournal of Waterway, Port, Coastal and Ocean Engineering
Hacim140
Basın numarası6
DOI'lar
Yayın durumuYayınlandı - 1 Kas 2014

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Publisher Copyright:
© 2014 American Society of Civil Engineers.

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