An experimental study has been carried out to investigate the effects of stress path on initial shear stiffness, Go, initial damping ratio, Do, and volumetric behaviour of Zenoz kaolin, an unsaturated silty clay, tested both in normally consolidated and over-consolidated conditions. To this purpose, a fixed-free Resonant Column-Torsional Shear device (RCTS-ns) working in suction controlled conditions has been used. Specimens have been compacted at the same void index by wet tamping, using the undercompaction technique. Go and Do have been measured almost continuously along complex stress paths. Similar values of initial shear stiffness, initial damping ratio, specific volume (v), and specific water volume (vw), are obtained in normally consolidated state when a given value of mean net stress and suction are reached after different stress paths.
Stress path effects on shear stiffness, damping ratio and volumetric behavior of normally consolidated unsaturated compacted clay / M., Biglari; D'Onofrio, Anna; Mancuso, Claudio; A., Shafiee; M. K., Jafari. - STAMPA. - 1:(2010), pp. 199-204. (Intervento presentato al convegno Fifth int. conference on unsaturated soils tenutosi a Barcelona nel 6-8 settembre 2010).
Stress path effects on shear stiffness, damping ratio and volumetric behavior of normally consolidated unsaturated compacted clay
D'ONOFRIO, ANNA;MANCUSO, CLAUDIO;
2010
Abstract
An experimental study has been carried out to investigate the effects of stress path on initial shear stiffness, Go, initial damping ratio, Do, and volumetric behaviour of Zenoz kaolin, an unsaturated silty clay, tested both in normally consolidated and over-consolidated conditions. To this purpose, a fixed-free Resonant Column-Torsional Shear device (RCTS-ns) working in suction controlled conditions has been used. Specimens have been compacted at the same void index by wet tamping, using the undercompaction technique. Go and Do have been measured almost continuously along complex stress paths. Similar values of initial shear stiffness, initial damping ratio, specific volume (v), and specific water volume (vw), are obtained in normally consolidated state when a given value of mean net stress and suction are reached after different stress paths.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.