Cyclic response of a stiffened suction caisson anchor in calcareous silt

Koh, Kai Xiang; Kim, Y. H.; Hossain, Muhammad Shazzad

doi:10.1016/j.oceaneng.2020.107097

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…This is to provide a relative perspective, but not for a direct comparison. This is because, as noted by Koh et al (2020), cyclic loading response depends on loading angle and object embedment depth relative to the mudline along with soil type, strength and sensitivity. As such, Equation 5 was developed excluding the other condition data although they show a similar trend.…”

Section: Capacity Ratiomentioning

confidence: 96%

“…Thus far a very few researchers have focused on caisson anchor response in calcareous soils (e.g. Randolph et al, 1998;Lehane et al, 2014;Koh et al, 2017Koh et al, , 2020. However, there are no corresponding industry standards and guidelines given in ISO (2016).…”

Section: Aim Of This Studymentioning

confidence: 99%

“…The lack of understanding of caisson behaviour has limited its application in calcareous seabed sediments although it may be a cost-effective option, as discussed previously (see also Lehane et al, 2015). The offshore industry has therefore identified a need for extending the application of caisson anchor in calcareous seabed sediments for cost-effective unlocking of stranded oil and gas fields in shallow, moderate and deep waters (Randolph, 2012;Frankenmolen et al, 2017;Koh et al, 2020). This paper therefore aims to investigate the behaviours of a stiffened caisson anchor and a chain in a reconstituted calcareous silt.…”

Section: Aim Of This Studymentioning

confidence: 99%

See 2 more Smart Citations

Insight into the Behavior of a Caisson Anchor under Cyclic Loading in Calcareous Silt

Mohiuddin

Hossain

Kim

et al. 2022

J. Geotech. Geoenviron. Eng.

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This paper provides insight into the behaviour of a stiffened caisson anchor under inclined cyclic loading in calcareous silt. A series of tests was conducted in a beam centrifuge. A monotonic test was first performed, quantifying the pure monotonic capacity, and then four cyclic loading tests varying mean load, amplitude and number of cycles. Cyclic soil characterisation T-bar tests and caisson tests were linked. Undrained cyclic T-bar tests led to generate excess pore pressure, resulting in degradation of soil strength and stiffness. For partially drained cyclic caisson tests, the excess pore pressure generated during initial undrained monotonic loading experienced partial dissipation. Healing due to consolidation outweighed the damage due to initial pore pressure generation. Post-cyclic monotonic capacity was found to be up to 35% higher compared to the pure monotonic capacity unless the anchor failed during cyclic loading. Measured rotation indicated the evolution of anchor failure mechanism. Caisson capacity under inclined loading was presented as a failure envelope, with the effect of cyclic loading accentuated. The contribution of the soil-chain interaction on the caisson capacity was minimal. No trenching was apparent on the soil surface, and no gap was formed around the anchor, in the considered centrifuge testing conditions.

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Section: Capacity Ratiomentioning

confidence: 96%