The paper analyzes the cyclic liquefaction behaviour of a pyroclastic silty sand typical of Neapolitan area through an extensive laboratory investigation. Cyclic undrained stress-controlled triaxial tests on natural and reconstituted samples were addressed to study the influence of state variables, such as relative density and effective confining stress, as well as of constitutive factors, i.e. fabric, particle breakage and non-plastic fine content. The results highlight that liquefaction resistance of the natural soil is significantly enhanced by fabric with respect to that of reconstituted samples tested at the same state conditions; on the other hand, the cyclic strength of the reconstituted soil appears poorly affected by the relative density and confining stress. Furthermore, the non-plastic fine ash was observed to increase the cyclic resistance of the pumice sand with respect to that of the same coarse matrix added with plastic clay. Finally, no appreciable evidences of grain crushing were detected on all tested soils containing pumice sand.

A laboratory investigation on the cyclic liquefaction resistance of pyroclastic soils / Licata, Valeria; D'Onofrio, Anna; Silvestri, Francesco; Olivares, L.; Bandini, V.. - (2016), pp. 241-248. (Intervento presentato al convegno international workshop on volcanic rocks and soils tenutosi a Lacco Ameno, Ischia Island (Italy) nel 24-25/09/2015).

A laboratory investigation on the cyclic liquefaction resistance of pyroclastic soils

LICATA, VALERIA;D'ONOFRIO, ANNA;SILVESTRI, FRANCESCO;
2016

Abstract

The paper analyzes the cyclic liquefaction behaviour of a pyroclastic silty sand typical of Neapolitan area through an extensive laboratory investigation. Cyclic undrained stress-controlled triaxial tests on natural and reconstituted samples were addressed to study the influence of state variables, such as relative density and effective confining stress, as well as of constitutive factors, i.e. fabric, particle breakage and non-plastic fine content. The results highlight that liquefaction resistance of the natural soil is significantly enhanced by fabric with respect to that of reconstituted samples tested at the same state conditions; on the other hand, the cyclic strength of the reconstituted soil appears poorly affected by the relative density and confining stress. Furthermore, the non-plastic fine ash was observed to increase the cyclic resistance of the pumice sand with respect to that of the same coarse matrix added with plastic clay. Finally, no appreciable evidences of grain crushing were detected on all tested soils containing pumice sand.
2016
978-1-315-64791-3
A laboratory investigation on the cyclic liquefaction resistance of pyroclastic soils / Licata, Valeria; D'Onofrio, Anna; Silvestri, Francesco; Olivares, L.; Bandini, V.. - (2016), pp. 241-248. (Intervento presentato al convegno international workshop on volcanic rocks and soils tenutosi a Lacco Ameno, Ischia Island (Italy) nel 24-25/09/2015).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/620160
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