Undrained capacity of circular shallow foundations on two-layer clays under combined VHMT loading

TY - JOUR

T1 - Undrained capacity of circular shallow foundations on two-layer clays under combined VHMT loading

AU - He, Pengpeng

AU - Newson, Tim

N1 - Copyright: © The Author(s) 2023.

PY - 2023/6

Y1 - 2023/6

N2 - Wind turbines are typically designed based on fatigue and serviceability limit states, but still require an accurate assessment of bearing capacity. Overconsolidated clay deposits in Canada often have a thin layer of crust with a relatively high undrained shear strength. However, existing bearing capacity design methods do not consider surficial crusts. This paper studies the undrained VHMT (vertical, horizontal, moment, and torsional) failure envelope of circular foundations founded on a surficial crust underlain by a uniform soil using finite element analysis. Crust correction factors have been introduced to account for the effects of the stiff layer on the vertical and moment capacities. The same forms of equation that are used for uniform soils, but with different parameters provide satisfactory fits for the failure envelopes for a soil with a crustal layer. An analytical expression for the 4-D VHMT failure envelope is derived, and an application of this method is provided.

AB - Wind turbines are typically designed based on fatigue and serviceability limit states, but still require an accurate assessment of bearing capacity. Overconsolidated clay deposits in Canada often have a thin layer of crust with a relatively high undrained shear strength. However, existing bearing capacity design methods do not consider surficial crusts. This paper studies the undrained VHMT (vertical, horizontal, moment, and torsional) failure envelope of circular foundations founded on a surficial crust underlain by a uniform soil using finite element analysis. Crust correction factors have been introduced to account for the effects of the stiff layer on the vertical and moment capacities. The same forms of equation that are used for uniform soils, but with different parameters provide satisfactory fits for the failure envelopes for a soil with a crustal layer. An analytical expression for the 4-D VHMT failure envelope is derived, and an application of this method is provided.

KW - Surficial crust

KW - circular foundation

KW - failure envelope

KW - finite element analysis

KW - zero-tension interface

UR - https://www.scopus.com/pages/publications/85146554368

U2 - 10.1177/0309524X221142276

DO - 10.1177/0309524X221142276

M3 - Article

SN - 0309-524X

VL - 47

SP - 579

EP - 596

JO - Wind Engineering

JF - Wind Engineering

IS - 3

ER -