INSIGHT INTO THE CYCLIC RESPONSE OF OWT PILE FOUNDATIONS IN CLAY: NUMERICAL SIMULATION OF PISA FIELD TESTS

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4. INSIGHT INTO THE CYCLIC RESPONSE OF OWT PILE FOUNDATIONS IN CLAY: NUMERICAL SIMULATION OF PISA FIELD TESTS

The Ta-Ger elasto-plastic constitutive framework (Tasiopoulou and Gerolymos, 2016a,b), originally used to simulate sand-like responses under monotonic and cyclic loading was extended to capture clay-like responses (Tasiopoulou et al.,2024) including features such as shear modulus degradation with strain level and number of loading cycles, hysteretic damping, softening and ratcheting under asymmetric loading. The Ta-Ger model for clays was used for 3D simulation of selected field tests of monopiles in Cowden clay conducted as part of the PISA program. The test piles simulated were 0.762-m medium diameter piles subjected to both monotonic and cyclic lateral and overturning loading. Comparison between numerical results and test measurements show that the simulations can reproduce the basic mechanisms of the monopile/soil system response, under both monotonic and cyclic loading. Features reproduced in the simulations include the accumulation of lateral displacement and rotation due to one-way cyclic loading. It is shown that the numerical methodology can be used to gain insight into soil-OWT foundation interaction mechanisms and to derive the soil reactions acting on the foundations as a result of lateral and overturning loads.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

9 - Monopile design to cyclic loads: quasi-static, dynamic and seismic loads