Nunziante Squeglia, Lo Presti Diego, Barbara Cosanti UNIVERSITA’ DI PISA Dipartimento di Ingegneria dell’Energia, dei Sistemi del Territorio e delle Costruzioni.

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Presentation transcript:

Nunziante Squeglia, Lo Presti Diego, Barbara Cosanti UNIVERSITA’ DI PISA Dipartimento di Ingegneria dell’Energia, dei Sistemi del Territorio e delle Costruzioni Re – evaluation of classification charts for CPTU in partially saturated loose silt mixtures WORKSHOP ON PENETRATION TESTING 9 OCTOBER 2014 AUDITIORIUM OPERA PRIMAZIALE

MOTIVATIONS SBT CLASSIFICATION CHARTS DO NOT CORRECTLY WORK IN CASE OF: –PARTIALLY SATURATED SOILS –LOOSE SILT MIXTURES

PARTIALLY SATURATED SOILS EXAMPLE BRONI (PV) SITE Fine grained soil

POSSIBLE CORRECTION EVALUATE SUCTION and CORRECT EFFECTIVE STRESS ADOPTED MODEL MK – KOVACS (Aubertin et al., 2003) –granular soil f(D 10, CU) –fine soil f(LL)

EFFECT OF CORRECTION (Ic): - BRONI

ROBERTSON & CAMPANELLA (1986) ROBERTSON (1990)

EFFECT OF CORRECTION (SBT): BRONI

LOOSE SILTY MIXTURES: Q c < 1 MPa

SERCHIO RIVER EMBANKMENTS

I c FROM BOREHOLES VS. I c FROM CPTU

Ic FROM BOREHOLES & CPTU

EFFECT OF CORRECTION

HOW TO DISTINGUISH LOOSE SILT MIXTURES FROM COMPRESSIBLE CLAYS ETC. COMPRESSIBLE CLAYS, PEATS, ETC. CAN HAVE q c < 1 MPa MAY FR GIVE USEFUL INDICATIONS? FRICTION RATIO < 4?

COMPRESSIBLE CLAYS: PISA EST

COMPRESSIBLE CLAYS: PISA WEST

COMPRESSIBLE CLAYS: PISA DISTRICT

COMPRESSIBLE CLAYS: LIVORNO DISTRICT

COMPRESSIBLE CLAYS: LUCCA DISTRICT

COMPRESSIBLE CLAYS: PRATO DISTRICT

COMPRESSIBLE CLAYS: GROSSETO DISTRICT

EFFECT OF SLEEVE DIAMETER (HOSKIN ET AL., 2014) (NZ - SANDS)

ACKNOWLEDGEMENTS CPT DATA IN TUSCANY HAVE BEEN PROVIDED BY GEOSERVIZI (COSCO & SPADARO) CPT INTERPRETATION HAS BEEN CARRIED OUT BY SCARDIGLI & ZACCAGNINO (UNDERGRADUATER STUDENTS) CPT DATA FROM BRONI HAVE BEEN GIVEN BY PAGANI AND DR. MEISINA (UNIPV) CPT INTERPRETATION OF BRONI DATA HAS BEEN CARRIED OUT BY ROSIGNOLI (GRADUATE STUDENT)