Numerical investigation of spudcan penetration in multi-layer deposits with an interbedded sand layer

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Abstract

For calculating spudcan penetration resistance in an interbedded sand layer between two clay layers, the recently developed mechanism-based design methods for surface sand-over-clay deposits are extended to account for the influence of the overlying clay layer. A series of large-deformation finite-element (LDFE) analyses were carried out, varying layer geometries and strength parameters. The numerical results and existing centrifuge test data are used to calibrate the extended design methods. The performance of the modified design methods and those suggested in the ISO standard 19905-1 is compared, confirming the accuracy of the former methods in estimating the peak penetration resistance in the sand layer. LDFE analyses were also carried out adding a strong fourth layer, with the corresponding effects on the increasing peak resistance in the second (sand) layer and squeezing behaviour (or limiting squeezing depth) in the third (soft clay) layer discussed. Design formulas are also developed to estimate the increase of peak resistance and limiting squeezing depth due to the presence of the strong fourth layer.

Original languageEnglish
Pages (from-to)1050-1066
Number of pages17
JournalGeotechnique
Volume67
Issue number12
DOIs
Publication statusPublished - 1 Dec 2017

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