Predicting Peak Resistance of Spudcan Penetrating Sand Overlying Clay

Hu, Pan; Stanier, Sam; Cassidy, Mark; Wang, Dong

doi:10.1061/(asce)gt.1943-5606.0001016

Cited by 82 publications

(115 citation statements)

References 16 publications

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“…The detailed interpretation of each parameter can be referred to Hu et al [55]. More recent work on punch-through failure in sand-over-clay can be found in Qiu and Grabe [56] and Dean [57].…”

Section: Penetration Of Spudcans (1) Bearing Capacity Failure In Unifmentioning

confidence: 99%

“…The reason lies in that the increasing bearing capacity of the foundation induced by a soil plug trapped below the spudcan is not accounted for in the guideline. A new calculation method accounting for the new failure mechanism was first proposed by Lee et al [54] and was further improved by Hu et al [55]. The peak resistance is the sum of the frictional resistance in sand and the bearing capacity of the underlying clay (the first term in eq.…”

Section: Penetration Of Spudcans (1) Bearing Capacity Failure In Unifmentioning

confidence: 99%

See 1 more Smart Citation

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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As the offshore engineering moving from shallow to deep waters, the foundation types for fixed and floating platforms have been gradually evolving to minimize engineering costs and structural risks in the harsh offshore environments. Particular focus of this paper is on the foundation instability and its failure mechanisms as well as the relevant theory advances for the prevailing foundation types in both shallow and deep water depths. Piles, spudcans, gravity bases, suction caissons, and plate anchors are detailed in this paper. The failure phenomena and mechanisms for each type of foundations are identified and summarized, respectively. The theoretical approaches along with sophisticated empirical solutions for the bearing capacity problems are then presented. The major challenges are from flow-structure-soil coupling processes, rigorous constitutive modeling of cyclic behaviors of marine sediments, and the spatial variability of soil properties for large-spreading structures. Further researches are suggested to reveal the instability mechanisms for underpinning the evolution of offshore foundations. Citation:Gao F P, Li J H, Qi W G, et al. On the instability of offshore foundations: theory and mechanism.

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Section: Penetration Of Spudcans (1) Bearing Capacity Failure In Unifmentioning

confidence: 99%

Section: Penetration Of Spudcans (1) Bearing Capacity Failure In Unifmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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“…As shown in Figure 12, Teh et al (2008) provided visual evidence that the peak punch-through resistance in sand-overclay cases occurs at a relatively shallow embedment between ~0.12 and 0.15D (also confirmed by Hu et al, 2013) and was caused by a failure mechanism that consists of a truncated cone of sand being forced vertically into the underlying clay layer. The truncated cone changes from pure vertical movement (directly under the spudcan) to radial and small amounts of heave further from the center line.…”

Section: Introduction and Challengesmentioning

confidence: 57%

“…The detailed derivation and final design equation can be found in Lee et al (2013 b Figure 13, is provided in Lee et al (2013 b ) and Hu et al (2013). These provide evidence that the existing punching shear and load spreading models in current jack-up industry guidelines (such as SNAME, 2008) significantly and consistently under-predict q peak .…”

Section: Figure 12 Piv Image At Punch-though Recorded In a Centrifugmentioning

confidence: 83%

Sustainability in an Era of Increasing Energy Demand: Challenges for Offshore Geotechnics

Cassidy

O’Loughlin

Gaudin

et al. 2014

Geo-Congress 2014 Keynote Lectures

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The world's escalating demand for energy, combined with the depletion of oil reserves in shallow waters and traditional regions, is resulting in the move of offshore developments into deeper waters, new development regions and transformation to cleaner natural gas and renewable energy sources. Summarized in this paper are the geotechnical challenges facing the offshore industry as it attempts to sustain the world's expanding energy demands. Representative examples of new methodologies being used in engineering design are provided, including deep water anchoring and mudmat systems, installation of mobile jack-up platforms in the stratified soils that are often encountered in new development regions around Australasia, and the potential use of caissons for floating wind farms.

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“…The test involved similar techniques to the work reported by Hu et al (2014), investigating punch-through of a 30 mm diameter flat footing (at 200g, so equivalent to 6 m diameter at prototype scale) on a 20 mm deep (4 m prototype) sand layer overlying clay. In the experiment, ϳ550 images were recorded at a frequency of 5 Hz using the apparatus described by Stanier and White (2013).…”

Section: Example Applicationmentioning

confidence: 99%

Improved image-based deformation measurement for geotechnical applications

et al. 2016

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This paper describes and benchmarks a new implementation of image-based deformation measurement for geotechnical applications. The updated approach combines a range of advances in image analysis algorithms and techniques best suited to geotechnical applications. Performance benchmarking of the new approach has used a series of artificial images subjected to prescribed spatially varying displacement fields. An improvement by at least a factor of 10 in measurement precision is achieved relative to the most commonly used particle image velocimetry (PIV) approach for all deformation modes, including rigid-body displacements, rotations, and strains (compressive and shear). Lastly, an example analysis of a centrifuge model test is used to demonstrate the capabilities of the new approach. The strain field generated by penetration of a flat footing and an entrapped sand plug into an underlying clay layer is computed and compared for both the current and updated algorithms. This analysis demonstrates that the enhanced measurement precision improves the clarity of the interpretation.Key words: image analysis, model tests, particle image velocimetry, digital image correlation.

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Predicting Peak Resistance of Spudcan Penetrating Sand Overlying Clay

Cited by 82 publications

References 16 publications

On the instability of offshore foundations: theory and mechanism

On the instability of offshore foundations: theory and mechanism

Sustainability in an Era of Increasing Energy Demand: Challenges for Offshore Geotechnics

Improved image-based deformation measurement for geotechnical applications

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