© 2015 Taylor & Francis Group, London. This paper describes numerical modelling of the penetration of ball penetrometers in dense silica sand overlying uniform clay deposits, identifying soil flow mechanisms around the ball and the evolving penetration resistance. Large Deformation Finite Element (LDFE) analyseswere conducted using the Remeshing and Interpolation Technique with Small Strain (RITSS) method. A recently developed critical state Mohr- Coulomb (CSMC) constitutive model was used to simulate the sand behaviour. The results were validated against centrifuge test data prior to undertaking a detailed parametric study, exploring the relevant range ofsand layer thickness and clay layer normalised strength. A sand plug was seen to be trapped at the base of the advancing ball and forced down into the clay layer. Thus the ball penetration resistance was higher than that of a clean ball penetrating in a single layer clay deposit. The height of the sand plug increased with increasingrelative thickness of the sand layer and decreasing normalised strength of the clay layer, leading to increase in frictional resistance around the periphery of the plug and hence the ball penetration resistance in the clay layer. These findings are the first step for accurate interpretation of the strength of the clay layer.
|Title of host publication||Frontiers in Offshore Geotechnics III|
|Place of Publication||London, UK|
|Publication status||Published - 2015|
|Event||Numerical investigation of ball penetrometer performance in dense sand overlying uniform clay - Oslo, Norway|
Duration: 1 Jan 2015 → …
|Conference||Numerical investigation of ball penetrometer performance in dense sand overlying uniform clay|
|Period||1/01/15 → …|