Numerical study of relationships between the cone resistances and footing bearing capacities in silica and calcareous sands

Pei, Huimin; Wang, Dong; Liu, Qingbing

doi:10.1016/j.compgeo.2022.105220

Cited by 3 publications

(1 citation statement)

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“…For dense sand (D r = 100%) used in the centrifugal test [12], Young's modulus E and the peak internal friction angle ϕ p are taken from the literature [49] after being obtained from triaxial tests; that is, E = 658 p a (σ 3 /p a ) 0.469 and ϕ p = 40.9-7.8l g (σ 3 /p a ), where p a is the standard atmospheric pressure (101.3 kPa) and σ 3 is the confining pressure and takes the value of gravity stress γ'H, kPa. The values of ϕ p herein are relatively close to those for dense uwa sand in the recent literature [50,51], and their difference is 1~2 • . The values of E and ϕ p for loose sand (D r = 30%) and medium dense sand (D r = 60%) were calculated proportionally based on the literature [52].…”

Section: Fem Modelsupporting

confidence: 86%

Numerical Investigation of Uplift Failure Mode and Capacity Estimation for Deep Helical Anchors in Sand

Yuan

Hao

Chen

et al. 2023

JMSE

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The uplift capacity of helical anchors is generally taken as the control condition for design in different applications, including transmission tower foundations and offshore structures. However, it is difficult to identify the failure surface for a deep helical anchor, which may result in an incorrect assessment of uplift capability. This research proposes a new unified method to estimate the uplift capacity of deep single-helix and multi-helix anchors based on the investigation of failure mechanisms. The deep failure mode was identified by FEM analysis using a modified Mohr–Coulomb model considering the strain softening of sand, along with the coupled Eulerian–Lagrangian technique. Thereby, a simplified rupture surface is proposed, and the equations estimating the uplift capacity are presented by the limit equilibrium method. Two important factors—the lateral earth pressure coefficient and the average internal friction angle included in the equations—are discussed and determined. The comparisons with centrifugal tests verify the reasonability of the proposed method.

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