A wireless high-speed data acquisition system for geotechnical centrifuge model testing

Gaudin, Christophe; White, David; Boylan, Noel; Breen, John J.; Brown, Timothy C.; Catania, S De; Hortin, P.

doi:10.1088/0957-0233/20/9/095709

Cited by 37 publications

(21 citation statements)

References 12 publications

(9 reference statements)

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“…A loading actuator with vertical and horizontal axes of motion (De Catania et al 2010) was employed. Data acquisition used a high-speed Ethernet-based system with data streaming in real-time to a remote desktop (Gaudin et al 2009). …”

Section: Geotechnical Centrifuge Facility and Equipmentmentioning

confidence: 99%

Tolerably mobile subsea foundations – observations of performance

Cocjin¹,

Gourvenec²,

White³

et al. 2014

Géotechnique

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Abstract:Increasing demands for oil and gas exploration in deep water with soft seabed conditions are resulting in the size and weight of subsea shallow foundations stretching the capabilities of installation technologies. One innovation to reduce foundation footprints involves designing foundations to move in a tolerable manner to absorb applied loads rather than being engineered to resist these loads and remain stationary. Critical design considerations are the evolution of foundation capacity and the mode of foundation displacement. The foundation should be designed to slide with acceptable settlement and rotation to prevent overstressing the joints with connected pipelines. This paper presents observations from centrifuge model tests of a mat foundation designed to slide under applied loading. The foundation is subjected to a simulated lifetime of operation, with many cycles of sliding and intervening periods of consolidation. The results provide insights to assist design, including a remarkable rise in the lateral foundation resistance over the sliding events, through repeated episodes of shearing and reconsolidation, and quantification of the accumulated settlements and rotations. The foundation is shown to translate with minimal rotation.The settlement between sliding events is more significant. This is due to the tendency for soft clay to contract on shearing, as excess pore pressures generated during sliding subsequently dissipate.The sliding-induced consolidation settlements control the tolerability of the performance of the mobile foundation.

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Section: Geotechnical Centrifuge Facility and Equipmentmentioning

confidence: 99%

Tolerably mobile subsea foundations – observations of performance

Cocjin¹,

Gourvenec²,

White³

et al. 2014

Géotechnique

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“…All the model tests described here were conducted in the drum centrifuge facility at the University of Western Australia (Stewart et al 1998) that is equipped with highspeed wireless data acquisition systems (Gaudin et al 2009). The centrifuge has an outer diameter of 1.2 m, with an annular channel of radial depth 200 mm and height 300 mm.…”

Section: Drum Centrifugementioning

confidence: 99%

Experimental investigation of reverse end bearing of offshore shallow foundations

2013

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An experimental investigation of Mana/Gourvenec/Randolph reverse end bearing of offshore shallow foundations 2 ABSTRACT Shallow skirted foundations can mobilise uplift resistance from end bearing in the short to medium term. However, uncertainty exists over the magnitude of reverse end bearing resistance compared with resistance in compression, and how this might be affected by a gap between the external face of the foundation skirt and the adjacent soil. The study presented in this paper explored the problem through centrifuge model tests, investigating the effect of skirt embedment ratio on (i) the magnitude of reverse end bearing capacity compared to compression capacity (ii) the uplift displacement associated with spontaneous loss of suction during uplift, and (iii) the effect of a vertical gap on the external skirt-soil interface.The results show that (i) peak uplift capacity equivalent to compression capacity can be mobilised for a fully sealed foundation with an intact skirt-soil interface,(ii) suction required for reverse end bearing can be maintained through considerable foundation displacement, even for low skirt embedment ratio, and (iii) the presence of a vertical gap along the external skirt-soil interface causes abrupt loss of suction beneath the top plate after minimal foundation displacement, with subsequent uplift capacity being markedly reduced.

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“…A loading arm was attached rigidly to the actuator and an S-shaped load cell with a measurement range of 500 N was attached to the base of the loading arm to measure the vertical load using an in-house data acquisition system (Gaudin et al, 2009). A lifting cradle was attached below the load cell, and the actuator axes adjusted such that this cradle was positioned under a lifting rod connected to the buried pipeline, allowing the pipeline to be loaded vertically without introducing moment ( Fig.…”

Section: Experimental Arrangementmentioning

confidence: 99%

The effect of radial fins on the uplift resistance of buried pipelines

Tom¹,

O’Loughlin²,

White³

et al. 2017

Géotechnique Letters

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This paper investigates the potential for increasing the uplift resistance of buried pipelines through the addition of radial fins on the pipe circumference. Experiments conducted in loose sand showed that fins extending by 20% of the pipe diameter increase the vertical peak uplift resistance by up to 25%, depending on embedment depth and fin configuration. A limit equilibrium solution -based on known values of peak friction and dilation angles -predicts the uplift resistance within 13% of the measurements. The trends of peak uplift resistance with embedment and fin configuration were also replicated in numerical analyses conducted using a non-associated Mohr-Coulomb soil model. The numerically predicted peak uplift resistances were within 10 and 21% of the experimental values for rough and smooth interfaces, respectively. Soil failure mechanisms from the numerical analyses were broadly consistent with that assumed in the limit equilibrium solution. However, the experimentally observed mechanisms differed subtly, with a limited extent of lifted soil above the pipe and circulatory flow occurring from above to beneath the pipe. This mechanism was approached in the numerical analyses for a smooth interface by specifying a small negative dilation angle, which had minimal effect on the predicted peak uplift resistance.

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A wireless high-speed data acquisition system for geotechnical centrifuge model testing

Cited by 37 publications

References 12 publications

Tolerably mobile subsea foundations – observations of performance

Tolerably mobile subsea foundations – observations of performance

Experimental investigation of reverse end bearing of offshore shallow foundations

The effect of radial fins on the uplift resistance of buried pipelines

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