Uplift Capacity of Anchor Plates in Two-layered Cohesive-frictional Soils

2011 ◽  
Vol 11 (3) ◽  
pp. 589-591 ◽  
Author(s):  
Hamed Niroumand ◽  
Khairul Anuar Kassim ◽  
Ramli Nazir
Keyword(s):  
Uplift Capacity ◽  
Anchor Plates ◽  
Frictional Soils

Evaluation of the efficiencies of helical anchor plates in sand by centrifuge model tests

2012 ◽  
Vol 49 (9) ◽  
pp. 1102-1114 ◽  
Author(s):  
C.H.C. Tsuha ◽  
N. Aoki ◽  
G. Rault ◽  
L. Thorel ◽  
J. Garnier
Keyword(s):  
Soil Mass ◽  
Model Tests ◽  
Uplift Capacity ◽  
Centrifuge Model ◽  
Different Types ◽  
Loading Tests ◽  
The Individual ◽  
Helical Plate ◽  
Anchor Plates ◽  
Centrifuge Model Tests

The uplift capacity of helical anchors normally increases with the number of helical plates. The rate of capacity gain is variable, considering that the disturbance caused by the anchor installation is generally more pronounced in the soil mass above the upper plates than above the lower plates, because the upper soil layers are penetrated more times. The present investigation examines the effect of the number of helices on the performance of helical anchors in sand, based on the results of centrifuge model tests. Uplift loading tests were performed on 12 different types of piles installed in two containers of dry sand prepared with different densities. The measured fractions of the uplift capacity related to each individual helical plate of multi-helix anchors were compared with the fractions predicted by the individual bearing method. The results of this investigation indicate that in double- and triple-helix anchors, the contributions of the second and third plate to the total anchor uplift capacity decreased with the increase of sand relative density and plate diameter. In addition, these experiments demonstrated that the variation of the anchor load–displacement behavior with the number of helices also depends on these parameters.

The influence of foundation geometry on the uplift behaviour of piles with enlarged bases

1992 ◽  
Vol 29 (3) ◽  
pp. 498-505 ◽  
Author(s):  
E. A. Dickin ◽  
C. F. Leung
Keyword(s):  
Key Words ◽  
Design Method ◽  
Failure Mechanisms ◽  
Model Tests ◽  
Diameter Ratio ◽  
Uplift Capacity ◽  
Base Diameter ◽  
Centrifugal Model ◽  
Anchor Plates ◽  
Empirical Design

Centrifugal model tests investigating the influence of shaft to base diameter ratio and bell angle on the uplift capacity of piles with enlarged bases (or belled piers) in sand are reported. Increases in the angle of bell and in diameter ratio both result in a decrease in net uplift capacity and failure displacement. This appears to account for observed differences in uplift capacity between belled piers and anchor slabs. Studies of failure mechanisms around models of belled piers and anchor plates show distinctly different behaviour characteristics between foundation types. The comparatively low uplift capacities observed for belled piers are attributed to a lesser degree of soil mobilization. An empirical design method for belled piers is proposed in which appropriate factors which account for foundation geometry are applied to a simple continuous anchor formula. Key words : piles, sand, uplift capacity, centrifuge, design.

Performance of piles with enlarged bases subject to uplift forces

1990 ◽  
Vol 27 (5) ◽  
pp. 546-556 ◽  
Author(s):  
E. A. Dickin ◽  
C. F. Leung
Keyword(s):  
Empirical Equation ◽  
Slip Surface ◽  
Surface Model ◽  
Loose Sand ◽  
Uplift Capacity ◽  
Base Diameter ◽  
Dense Sand ◽  
Centrifuge Tests ◽  
Anchor Plates ◽  
Uplift Forces

The influence of embedment, base diameter, and backfill density on the uplift behaviour of piles with enlarged bases embedded in sand was investigated in a centrifuge. Comparitive tests on straight-shafted piles are also reported. For piles in dense sand, sensible agreement was found with earlier research on anchor plates and published field data. However, uplift capacities in loose sand were considerably lower than previously observed for anchor plates. A number of theories for anchors considerably overpredict the observed capacity for belled piers in both dense and loose sand, although in the case of dense sand, reasonable values are obtained using an empirical equation derived from centrifuge tests on anchor plates and a finite element based design approach. The normally conservative vertical slip-surface model is alone in providing reasonable agreement with the surprisingly low observations for piles in loose sand. Key words: piles, uplift capacity, centrifuge tests, sand.

Predicting Pullout Resistance of Bearing Reinforcement Embedded in Cohesive-Frictional Soils

2020 ◽  
Vol 32 (3) ◽  
pp. 04019379
Author(s):  
Gampanart Sukmak ◽  
Patimapon Sukmak ◽  
Apichet Joongklang ◽  
Artit Udomchai ◽  
Suksun Horpibulsuk ◽  
...  
Keyword(s):  
Pullout Resistance ◽  
Frictional Soils

scholarly journals Uplift Capacity of Rigid Steel Pile Groups in Clay

1985 ◽  
Vol 25 (4) ◽  
pp. 117-122 ◽  
Author(s):  
Braja M. Das ◽  
Mohammad Farooq Azim
Keyword(s):  
Uplift Capacity ◽  
Pile Groups

Undrained uplift capacity of deeply embedded strip anchors in non-uniform soil

2015 ◽  
Vol 70 ◽  
pp. 41-49 ◽  
Author(s):  
S.B. Yu ◽  
J.P. Hambleton ◽  
S.W. Sloan
Keyword(s):  
Uplift Capacity
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