Using small-strain stiffness to predict the load-settlement behaviour of shallow foundations on sand

Archer, Andre; Heymann, G.

doi:10.17159/2309-8775/2015/v57n2a4

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…The model developed by Van Tonder (2016), shown in Figure 1, is used to determine the permeability of a soil sequence in a centrifuge and entails a 1000 mm tall acrylic Plexiglas cylinder with an inner diameter of 140 mm placed inside an aluminium strongbox. The uniform fine-grained sand has an average particle size of 135 µm and average reported permeability of 1.8 x 10 -4 m/s to limit the number of variables (Archer 2014). The sand is placed in de-aired water to a height of 600 mm above a 50 mm base filter.…”

Section: Model Preparation and Test Proceduresmentioning

confidence: 99%

Assessing geotechnical centrifuge modelling in addressing variably saturated flow in soil and fractured rock

Jones

Brouwers

Tonder

et al. 2017

Environ Sci Pollut Res

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The vadose zone typically comprises soil underlain by fractured rock. Often, surface water and groundwater parameters are readily available, but variably saturated flow through soil and rock are oversimplified or estimated as input for hydrological models. In this paper, a series of geotechnical centrifuge experiments are conducted to contribute to the knowledge gaps in: (i) variably saturated flow and dispersion in soil and (ii) variably saturated flow in discrete vertical and horizontal fractures. Findings from the research show that the hydraulic gradient, and not the hydraulic conductivity, is scaled for seepage flow in the geotechnical centrifuge. Furthermore, geotechnical centrifuge modelling has been proven as a viable experimental tool for the modelling of hydrodynamic dispersion as well as the replication of similar flow mechanisms for unsaturated fracture flow, as previously observed in literature. Despite the imminent challenges of modelling variable saturation in the vadose zone, the geotechnical centrifuge offers a powerful experimental tool to physically model and observe variably saturated flow. This can be used to give valuable insight into mechanisms associated with solid-fluid interaction problems under these conditions. Findings from future research can be used to validate current numerical modelling techniques and address the subsequent influence on aquifer recharge and vulnerability, contaminant transport, waste disposal, dam construction, slope stability and seepage into subsurface excavations.

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Section: Model Preparation and Test Proceduresmentioning

confidence: 99%

Assessing geotechnical centrifuge modelling in addressing variably saturated flow in soil and fractured rock

Jones

Brouwers

Tonder

et al. 2017

Environ Sci Pollut Res

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“…A comprehensive investigation into the properties of the sacrificial sand layer used was done by Archer & Heymann (2015). The grading curve of the sand is shown in Figure 5.…”

Section: Materials Usedmentioning

confidence: 99%

Optimal placement of reinforcement in piggyback landfill liners

Marx

Jacobsz

2018

Geotextiles and Geomembranes

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The optimal placement of geogrid reinforcement in clay liners subject to differential settlement was investigated both numerically and with centrifuge modelling. Two unreinforced liners, a liner reinforced at the top-quarter depth, a liner reinforced at the bottom-quarter depth and a double reinforced liner were modelled in the centrifuge. Differential settlement was induced on the model liners by lowering a trapdoor overlain with sand. By considering: 1) the magnitude of differential settlement required to induce micro-cracks in the liners, 2) the strain fields across the liners during differential settlement and 3) the distribution of these strain fields, it was found that dividing the available reinforcement equally between the top-quarter and bottom-quarter of the liner, i.e. double reinforcement, represents the optimal reinforcement strategy.

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“…Many stiffness reduction curves have been proposed to describe the non-linear stress strain relationship observed for soils, including Vucetic and Dobry (1991), Rollins et al (1998), Clayton and Heymann (2001), and Archer and Heymann (2015). For all analyses representative stiffness values were calculated by applying the stiffness reduction function suggested by Rollins et al (1998, Equation 2 below) to the midrange values determined from the CSW tests.…”

Section: Settlement Analysismentioning

confidence: 99%

The application of continuous surface wave testing for settlement analysis with reference to a full-scale load test for a bridge at Pont Melin, Wales, UK

Heymann

Rigby-Jones²,

Milne³

2017

J. S. Afr. Inst. Civ. Eng.

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Using small-strain stiffness to predict the load-settlement behaviour of shallow foundations on sand

Abstract: Archer A, Heymann G. Using small-strain stiffness to predict the load-settlement behaviour of shallow foundations on sand.

Cited by 10 publications

References 20 publications

Assessing geotechnical centrifuge modelling in addressing variably saturated flow in soil and fractured rock

Assessing geotechnical centrifuge modelling in addressing variably saturated flow in soil and fractured rock

Optimal placement of reinforcement in piggyback landfill liners

The application of continuous surface wave testing for settlement analysis with reference to a full-scale load test for a bridge at Pont Melin, Wales, UK

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