Vibratory installation of bucket foundations

This paper presents an analysis of vibratory installation of short, large-diameter bucket foundations. Vibratory installation has numerous conventional applications, e.g. bridge caisson foundations, as well as considerable promise for offshore wind farm development. Although ideally suited to cohesionless soil profiles, vibratory driving is also feasible in clays. Desirable features of vibratory driving include its feasibility for a broad range of soil profiles, low driving stresses, rapid installation time, and low noise levels. For installation in cohesionless soils, the model employs classical soil-structure interaction theory for shallow rigid foundations. The crux of the analysis is the determination of the cyclic strain at the soil-wall interface of the bucket to determine whether it reaches the threshold cyclic strain for porewater pressure generation and strength degradation, which permits advancement of the pile into the seabed. For installation in clays, the threshold cyclic strain is typically too high to be reached by pile cyclic excitation. Nevertheless, penetration is possible if the dead weight of the pile plus the vibro-driver inertial force can overcome soil resistance. The proposed model invokes rigid body dynamic equilibrium to simulate penetration in clays.


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  • Accession Number: 01875039
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 28 2023 9:20AM