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oai:recercat.cat:2117/3424712026-01-30T08:54:48Zcom_2072_1033col_2072_452950

Large-strain analysis of undrained smooth tube sampling Monforte Vila, Lluís Arroyo Álvarez de Toledo, Marcos Carbonell Puigbó, Josep Maria Gens Solé, Antonio Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental Centre Internacional de Mètodes Numèrics en Enginyeria Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques Universitat Politècnica de Catalunya. RMEE - Grup de Resistència de Materials i Estructures en l'Enginyeria Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls Clay soils Clays Numerical modelling Sampling Sols argilosos Borehole tube sampling is a key process of geotechnical engineering. The paper presents numerical analyses of smooth tube sampling in clay using the Particle Finite Element Method (PFEM). The soil is described by a conventional elasto-plastic constitutive model (Tresca plasticity and a quasi-incompressible elastic law). The sampler is advanced by several diameters into the soil until a steady state is observed. The elasto-plastic numerical solution for a round-tipped sampler clearly identifies a localized shear failure mechanism at the entrance of the tube. Relevant Strain Path Method (SPM) solutions are numerically evaluated to facilitate full field comparison. For a given thickness ratio elasto-plastic simulation predicts far less compression but much larger extensions at the centerline than SPM. The results also show how including a beveled sampler tip or a stationary piston changes the failure mechanism and significantly reduces induced peak extension strains. The results agree with available experimental data and well-established empirical observations. The methodology presented may open the way to a soil mechanics based rational approach to soil sampling simulation. This work has been supported by the Ministry of Science and Innovation of Spain through research grant BIA2017-84752-R. The third author acknowledge financial support from the Spanish Ministry of Economy and Competitiveness, through the "Severo Ochoa Programme for Centres of Excellence in R&D" (CEX2018-000797-S) Peer Reviewed Postprint (author's final draft) 2022-01 Article Monforte, L. [et al.]. Large-strain analysis of undrained smooth tube sampling. "Géotechnique", 2022, vol. 72, núm. 1, p. 61-77. 0016-8505 https://hdl.handle.net/2117/342471 10.1680/jgeot.19.p.354 eng https://www.icevirtuallibrary.com/doi/pdf/10.1680/jgeot.19.P.354 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/BIA2017-84752-R/ES/INESTABILIDAD HIDROMECANICA EN SUELOS: DETECCION Y EVALUACION/ Open Access 17 p. application/pdf Thomas Telford