Indentation of a Sensitive Clay by a Flat-Ended Axisymmetrical Punch

Autor: Vincenzo Silvestri, Michael James, Mireille Sandrine Ewane
Rok vydání: 2018
Předmět:
Zdroj: Geotechnical and Geological Engineering. 36:3601-3625
ISSN: 1573-1529
0960-3182
DOI: 10.1007/s10706-018-0561-4
Popis: This paper presents a description and the results of instrumented macro-scale laboratory indentation testing of Champlain Sea Clay with a stainless steel, flat-tipped, cylindrical indenter. The results of the tests were analyzed using published analytical solutions for the indentation testing of elastic–plastic materials. The relationship between the depth of indentation, h, and the load on the indenter, P, the hardness, the undrained shear strength and the Young’s modulus of the clay were determined from these methods. The undrained shear strength and Young’s modulus were compared to values from conventional geotechnical testing. Indentation testing was simulated numerically using the finite element method. The clay was modelled using the conventional Mohr–Coulomb elastic–plastic model. The distribution of total vertical stress below the indenter from the simulations compared well with an analytical solution based on elastic theory. The simulations using material properties derived from the conventional geotechnical tests (Set 1) and derived from the indentation testing (Set 2) with a Poisson’s ratio of 0.49 (undrained loading) did not produce load-penetration (P–h) curves in good agreement with the curves from indentation testing. However, simulations with the material properties derived from indentation testing and a Poisson’s ratio of 0.2 (drained loading), produced load-penetration curves in good agreement with the indentation testing results.
Databáze: OpenAIRE
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