A master thesis from Aalborg University
The bearing capacity analysis of suction caisson anchor in undrained clay
Author(s)
Term
4. term
Education
Publication year
2024
Submitted on
2024-09-06
Pages
194 pages
Abstract
The suction caisson anchor bearing capacity in undrained clay is analysed in this thesis. The analytical and numerical approaches are used for finding the ultimate bearing capacities of suction caisson anchor. Present analytical theories and failure mechanism are applicable for length (L) to diameter (D) ratio, also known as aspect ratio (L/D) from 2 to 6. Three aspect ratios- 2,4,6 are considered in this study. Same assumptions and conditions are applied for both analytical and numerical approach. The numerical geotechnical software PLAXIS 3D is used for modelling and analysing the suction caisson capacity. The normally consolidated undrained uniform clay soil is considered in this thesis. The soft, medium and stiff soil conditions represented by undrained shear strength-20, 50 and 100 kPa. To analyse the effect of different parameters on the suction caisson capacity total 11 different combinations are considered. For each combination analytical and numerical failure envelopes are drawn on H-V plane, in almost all the combinations the numerical failure envelope is higher than analytical failure envelope. The tension load is applied with the angles 20°, 30° and 40° for each combinations. The angular load exceeds the failure envelope on the normalized H-V plane. The normalization is done with the calibrated horizontal capacity and analysed vertical capacity for each combinations. The analytical failure envelope is calibrated by PLAXIS results and capacity reduction factor is proposed for PLAXIS capacities.
Keywords
Documents
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