Axial capacity of offshore piles driven in dense sand

1996 ◽  
Author(s):  
R.J. Jardine ◽  
R.F. Overy
Keyword(s):  
Dense Sand ◽  
Axial Capacity ◽  
Offshore Piles

Bearing capacity of model piles driven into dense overconsolidated sands

1998 ◽  
Vol 35 (2) ◽  
pp. 374-385 ◽  
Author(s):  
P Foray ◽  
L Balachowski ◽  
J -L Colliat
Keyword(s):  
Bearing Capacity ◽  
Skin Friction ◽  
Petroleum Industry ◽  
Design Parameters ◽  
Soil Conditions ◽  
Compression Tests ◽  
Dense Sand ◽  
Axial Capacity ◽  
Cone Penetration Tests ◽  
Tension And Compression

Model piles were driven into dense siliceous sand samples and tested in a large calibration chamber. Axial tension and compression tests were performed on open-ended pipe piles. The objective of this research was to study the effect of overconsolidation on the bearing capacity of piles driven into dense sands representative of North Sea soil conditions. Emphasis was put on points of interest for the offshore petroleum industry in particular: dense to very dense normally consolidated (NC) and overconsolidated (OC) sands, unit end bearing and unit skin friction capacities, and comparison with tip resistances from cone penetration tests. Design parameters are proposed for computing the axial bearing capacity of piles driven into dense to very dense siliceous sands. They are compared with those given in the current American Petroleum Industry's Recommended Practice 2A document. A relationship between CPT cone resistance and ultimate unit end bearing and skin friction capacities of piles is also proposed.Key words: model test, dense sand, offshore pile driving, axial capacity, end bearing, skin friction, design parameters, cone penetrometer.

Influence of intermediate stiffeners on the axial capacity of cold-formed steel back-to-back built-up unequal angle sections

Structures ◽  
2021 ◽  
Vol 32 ◽  
pp. 827-848
Author(s):  
G. Beulah Gnana Ananthi ◽  
M.S. Deepak ◽  
Krishanu Roy ◽  
James B.P. Lim
Keyword(s):  
Axial Capacity ◽  
Cold Formed Steel

scholarly journals Design of plate and screw anchors in dense sand: failure mechanism, capacity and deformation

2019 ◽  
Vol 92 ◽  
pp. 16010
Author(s):  
Benjamin Cerfontaine ◽  
Jonathan Knappett ◽  
Michael Brown ◽  
Aaron Bradshaw
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Failure Mechanism ◽  
Progressive Failure ◽  
Vertical Direction ◽  
Shear Plane ◽  
Design Methods ◽  
Embedment Depth ◽  
Limiting State ◽  
Dense Sand

Plate and screw anchors provide a significant uplift capacity and have multiple applications in both onshore and offshore geotechnical engineering. Uplift design methods are mostly based on semi-empirical approaches assuming a failure mechanism, a normal and a shear stress distribution at failure and empirical factors back-calculated against experimental data. However, these design methods are shown to under- or overpredict most of the existing larger scale experimental tests. Numerical FE simulations are undertaken to provide new insight into the failure mechanism and stress distribution which should be considered in anchor design in dense sand. Results show that a conical shallow wedge whose inclination to the vertical direction is equal to the dilation angle is a good approximation of the failure mechanism in sand. This shallow mechanism has been observed in each case for relative embedment ratios (depth/diameter) ranging from 1 to 9. However, the stress distribution varies non-linearly with depth, due to the soil deformability and progressive failure. A sharp peak of normal and shear stress can be identified close to the anchor edge, before a gradual decrease with increasing distance along the shear plane. The peak stress magnitude increases almost linearly with embedment depth at larger relative embedment ratios. Although further research is necessary, these results lay the basis for the development of a new generation of design criteria for determining anchor capacity at the ultimate limiting state.

Sign in / Sign up

Export Citation Format

Share Document