Master Thesis - Biying Zhou - BAKK9
Translated title
Seismic Response of Suction Caissons in Liquefiable Soil
Author
Zhou, Biying
Term
4. term
Education
Publication year
2020
Submitted on
2020-08-20
Abstract
Formålet med specialet er at analysere den seismiske ydeevne af offshore sugekassefundamenter (mono-bucket) til vindmøller i liquefierbar (liquefaktionsudsat) jord, med særligt fokus på sætninger under og efter jordskælv. Arbejdet kombinerer en gennemgang af teori og state-of-the-art om liquefaktion og sugekassefundamenter med 3D-finite element-analyser i PLAXIS 3D, hvor UBC3D‑PLM jordmodellen for sand og siltet sand anvendes til at beskrive liquefaktionsadfærd. Den numeriske model valideres under harmoniske excitationer og kalibreres mod tidligere udførte centrifugeforsøg både i frit felt og ved jord–konstruktion-niveau. På baggrund af den kalibrerede model undersøges jord–fundament-interaktionen og sætningernes forløb omkring og under sugekassen, og modellens usikkerheder vurderes gennem sammenligning med forsøgsdata. Konkrete resultater er ikke præsenteret i dette uddrag; specialet etablerer en ramme for at vurdere liquefaktionsinducerede sætninger af sugekassefundamenter i seismiske områder.
This thesis investigates the seismic performance of offshore suction caisson (mono-bucket) foundations for wind turbines in liquefiable soil, with particular emphasis on settlement during and after earthquakes. The study combines a review of liquefaction and suction caisson behavior with 3D finite element analyses in PLAXIS 3D, employing the UBC3D‑PLM constitutive model for sands and silty sands to capture liquefaction. The numerical model is validated under harmonic base motions and calibrated against previously performed centrifuge tests at both free-field and soil–structure levels. Based on the calibrated model, soil–foundation interaction and settlement patterns beneath and around the caisson are analyzed, and model uncertainties are assessed by comparison with experimental data. Specific findings are not provided in this excerpt; the thesis establishes a framework for evaluating liquefaction-induced settlement of suction caissons in seismic regions.
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