Effect of creep on settlement of granular pile reinforced ground

Madhav, Madhira R.; Suresh, K.; Peter, E. C. Nirmala

doi:10.3328/ijge.2010.04.04.495-505

Cited by 8 publications

(15 citation statements)

References 10 publications

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“…Review of Madhav et al (2009Madhav et al ( , 2010 The method developed by Madhav et al (2009Madhav et al ( , 2010 is based on an extension of an earlier method for primary settlement developed by Shahu et al (2000), also based on the unit-cell assumption. However, in contrast to the methods reviewed in Sexton et al (2014), the method developed by Shahu et al (2000) incorporates a granular mat in order to combat/ reduce the high stress concentrations that occur near the top of the granular columns.…”

Section: 3mentioning

confidence: 99%

“…Other than an analytical formulation by Madhav et al (2009Madhav et al ( , 2010 accounting for creep settlements, the majority of the analytical methods for determining n values are either nonspecific or pertain to primary settlement only (e.g. Castro and Sagaseta, 2009;Priebe, 1995;Pulko et al, 2011), and in the absence of further guidance, designers sometimes apply these methods to estimate the improvement to both creep and primary settlements.…”

Section: Introductionmentioning

confidence: 99%

“…As the Madhav et al (2009Madhav et al ( , 2010 method is based on elastic theory, n values will be over-predicted unless adequate thickness of granular mat is provided. Additionally, the method is based on the assumption that primary consolidation is finished before creep begins (creep 'hypothesis A'), which has been denounced in recent years; creep 'hypothesis B' (also known as the isotache concept, e.g.…”

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confidence: 99%

“…Degago et al, 2011), which models creep occurring concurrently with primary consolidation, is preferred. The Madhav et al (2009Madhav et al ( , 2010 method also assumes that the soil is initially normally consolidated so that only C c influences primary settlement, as shown in Equation 3 (C s is only taken into account when considering the unloading from soil to column due to creep, e.g. Equation 8).…”

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confidence: 99%

“…An iterative procedure can then be used to solve for σ c and σ s in each element by combining Equations 4 and 5 (Equation 5 describes the equilibrium of vertical stresses in each element). Madhav et al (2009Madhav et al ( , 2010 account for creep based on the principle that the stress on the soil will decrease as it creeps (Δσ s ) while the column (which does not creep) will assume the surplus . A similar load transfer mechanism has also been suggested by Mitchell and Kelly (2013).…”

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confidence: 99%

See 4 more Smart Citations

Creep improvement factors for vibro-replacement design

Sexton

Sivakumar²,

McCabe

2017

Proceedings of the Institution of Civil Engineers - Ground Impr

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This work is made available online in accordance with the publisher's policies. Please refer to any applicable terms of use of the publisher. General rightsCopyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Although the vibro-replacement stone column technique is being deployed increasingly in soft cohesive soil deposits in which creep settlements may be significant/dominant, the majority of existing stone column settlement design methods are either non-specific or pertain to primary settlement only. Consequently, in the absence of further guidance, designers sometimes apply the same settlement improvement factor to creep settlements that they have estimated for primary settlements. In this paper, Plaxis 2D finite-element analyses carried out in conjunction with the elasto-viscoplastic soft soil creep model have indicated that settlement improvement factors are lower when creep is considered and therefore the design of stone columns ignoring creep is unconservative. These analyses were used to establish the impact of a range of relevant variables on 'primary', 'total' and 'creep' settlement improvement factors, leading to the development of a simplified empirical approach for predicting creep settlement improvement factors for use in conjunction with an existing primary settlement design method.

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