Mark Randolph
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View article: Development of a mini vibro-driver for pile testing in the centrifuge
Development of a mini vibro-driver for pile testing in the centrifuge Open
Using vibro-installation to fully install monopiles for offshore wind turbines (OWT) has the potential to mitigate pile run, significantly reduce noise emissions to the marine environment, and decrease project costs. However, due to the in…
View article: Investigating Installation and Post-Installation Performance of Vibro-Driven Monopiles in Sand: Centrifuge Modelling and Numerical Analysis
Investigating Installation and Post-Installation Performance of Vibro-Driven Monopiles in Sand: Centrifuge Modelling and Numerical Analysis Open
The majority of bottom-fixed offshore wind turbines are supported by monopiles. Vibro-driving offers an alternative to impact driving, with advantages including rapid installation in particular in sand, lower acoustic emissions and mitigat…
View article: Load-Time Failure Envelopes for Suction Caissons Under Sustained Vertical Loading
Load-Time Failure Envelopes for Suction Caissons Under Sustained Vertical Loading Open
Suction caissons are established as a reliable anchoring system to moor a range of offshore floating facilities. Under sustained loads, generally characterized by long durations, the caisson holding capacity against uplift loading, that re…
View article: Preliminary assessment of potential pile tip damage and extrusion buckling
Preliminary assessment of potential pile tip damage and extrusion buckling Open
Pile tip damage has become of particular concern for the offshore wind industry due to the extensive use of large-diameter, thin-walled piles for monopiles and jacket structures. The potential for damage has increased in recent development…
View article: Calibration of strain-softening constitutive model parameters from full-field deformation measurements
Calibration of strain-softening constitutive model parameters from full-field deformation measurements Open
Many offshore geotechnical problems—such as cyclic T-bar penetration and lateral buckling of pipelines—are affected by the tendency of fine-grained soils to strain-soften due to remoulding. Careful calibration of the constitutive model par…
View article: IMPACT: cloud-based software for stress-wave and drivability analysis of driven piles
IMPACT: cloud-based software for stress-wave and drivability analysis of driven piles Open
The dynamic analysis software, IMPACT, was originally developed some 30 years ago for drivability assessment and stress-wave matching of driven piles. The software has recently been launched as a web-based application, which brings major a…
View article: Investigating vibro-driven monopile installation into sand in a geotechnical centrifuge
Investigating vibro-driven monopile installation into sand in a geotechnical centrifuge Open
Bottom-fixed foundations currently dominate the offshore wind market. The installation of monopiles for offshore wind turbines by vibration is a promising alternative to the conventional impact-driven technique. Despite being a lownoise, t…
View article: Upslope Failure Mechanisms and Criteria in Submarine Landslides: Shear Band Propagation, Slab Failure and Retrogression
Upslope Failure Mechanisms and Criteria in Submarine Landslides: Shear Band Propagation, Slab Failure and Retrogression Open
The volume of a submarine landslide is likely to be amplified by shear band propagation along a basal surface or spreading failure extension in the sliding layer. Although the mechanism of translational submarine landslides has been unders…
View article: The influence of pipeline-backfill-trench interaction on the lateral soil resistance: A numerical investigation
The influence of pipeline-backfill-trench interaction on the lateral soil resistance: A numerical investigation Open
Large lateral displacement of trenched subsea pipelines may be induced by ground movement, landslides, ice gouging, etc. Pre-excavated seabed soil is usually used for backfilling as a cost-effective solution. The large difference between t…
View article: Upslope failure mechanisms and criteria in submarine landslides: shear band propagation, slab failure and retrogression
Upslope failure mechanisms and criteria in submarine landslides: shear band propagation, slab failure and retrogression Open
The datasets include all used data in a paper, titled at 'Upslope failure mechanisms and criteria in submarine landslides: shear band propagation, slab failure and retrogression', to Journal of Geophysical Research - Solid Earth.
View article: Upslope failure mechanisms and criteria in submarine landslides: shear band propagation, slab failure and retrogression
Upslope failure mechanisms and criteria in submarine landslides: shear band propagation, slab failure and retrogression Open
The datasets include all used data in a paper, titled at 'Upslope failure mechanisms and criteria in submarine landslides: shear band propagation, slab failure and retrogression', to Journal of Geophysical Research - Solid Earth.
View article: Effect of pipeline-seabed gaps on the vertical forces of a pipeline induced by submarine slide impact
Effect of pipeline-seabed gaps on the vertical forces of a pipeline induced by submarine slide impact Open
In recent years, the interaction between submarine slide runout and offshore pipelines has received extensive attention, based on the need to protect pipelines crossing regions susceptible to submarine slides. The interaction force between…
View article: Towards a simple and reliable method for calculating uplift capacity of plate anchors in sand
Towards a simple and reliable method for calculating uplift capacity of plate anchors in sand Open
This paper investigates the uplift capacity of horizontal plate anchors in sand through finite element analyses and centrifuge experiments. The finite element simulations adopt a sophisticated bounding surface plasticity model that account…
View article: Use of a bounding surface model in predicting element tests and capacity in boundary value problems
Use of a bounding surface model in predicting element tests and capacity in boundary value problems Open
The paper examines the merit of a bounding surface plasticity model at both element and system level. The governing equations are based essentially on the parent bounding surface plasticity model reported by Dafalias and Manzari in 2004 wi…
View article: Optimization of Impact Pile Driving Using Optical Fiber Bragg-Grating Measurements
Optimization of Impact Pile Driving Using Optical Fiber Bragg-Grating Measurements Open
This paper reports the use of optical fiber Bragg-grating (FBG) sensors to monitor the stress waves generated below ground during pile driving, combined with measurements using conventional pile driving analyzer (PDA) sensors mounted at th…
View article: Power Side-Channel Attack Analysis: A Review of 20 Years of Study for the Layman
Power Side-Channel Attack Analysis: A Review of 20 Years of Study for the Layman Open
Physical cryptographic implementations are vulnerable to so-called side-channel attacks, in which sensitive information can be recovered by analyzing physical phenomena of a device during operation. In this survey, we trace the development…
View article: A smoothed particle hydrodynamics modelling of soil–water mixing and resulting changes in average strength
A smoothed particle hydrodynamics modelling of soil–water mixing and resulting changes in average strength Open
Summary Soil–water interaction is a pivotal process in many underwater geohazards such as underwater landslides where soil sediments gradually evolve into turbidity currents after interactions with ambient water. Due to the large deformati…
View article: Rapid penetration of spudcans in sand
Rapid penetration of spudcans in sand Open
The growing pressure for jack-up rigs to relocate during more challenging metocean conditions for offshore wind turbine installation and maintenance has increased the risk of dynamic leg loading during the set down of the spudcan footings …
View article: Criteria for planar shear band propagation in submarine landslides along weak layers
Criteria for planar shear band propagation in submarine landslides along weak layers Open
Gigantic submarine landslides pose a significant threat to offshore infrastructures and may be initiated by an inconspicuous weakened zone, followed by catastrophic shear band propagation under the effect of strain softening. Much attentio…
View article: Consolidation effects on monotonic and cyclic capacity of plate anchors in sand
Consolidation effects on monotonic and cyclic capacity of plate anchors in sand Open
This study investigated the change in monotonic and cyclic capacity of a plate anchor across different degrees of consolidation in dense sand. To quantify the effect of consolidation on anchor capacity, a framework is introduced and valida…
View article: Penetrometer testing in a calcareous silt to explore changes in soil strength
Penetrometer testing in a calcareous silt to explore changes in soil strength Open
This paper describes a centrifuge study using a range of penetrometer tests (T-bar, piezocone and free-fall piezocone) to explore strength changes in a reconstituted, normally consolidated, natural calcareous silt. Various penetrometer tes…
View article: Foundation Design in Offshore Carbonate Sediments – Building on Knowledge to Address Future Challenges
Foundation Design in Offshore Carbonate Sediments – Building on Knowledge to Address Future Challenges Open
Carbonate sediments are prevalent in many major offshore oil and gas basins, as well as a growing number of regions assigned to offshore wind development. Identified as difficult from an engineering perspective, the failure to properly cha…
View article: Effectiveness of Effective Area Method for Assessing Undrained Capacity of Shallow Rectangular Foundations
Effectiveness of Effective Area Method for Assessing Undrained Capacity of Shallow Rectangular Foundations Open
This paper investigates the effectiveness of the effective area method (EAM) for assessing the undrained load-carrying capacity of rectangular foundations under combined vertical (V), horizontal (H) and moment loading (M) by comparing with…
View article: Transition from shear band propagation to global slab failure in submarine landslides
Transition from shear band propagation to global slab failure in submarine landslides Open
The risk posed by seabed instability is of increasing significance as offshore activities including oil and gas developments continue to expand in this century. Many studies have considered runout of debris flows resulting from submarine l…
View article: The parkable piezoprobe for determining <i>c</i><sub>v</sub> and strength – modelling and interpretation methods
The parkable piezoprobe for determining <i>c</i><sub>v</sub> and strength – modelling and interpretation methods Open
The parkable piezoprobe is a site investigation tool for measuring the coefficient of consolidation, in situ offshore, at shallow embedment depths. The device applies a similar bearing pressure to subsea infrastructure so it reaches a comp…