LA RIDUZIONE DEL RISCHIO SISMICO NELLA PIANIFICAZIONE DEL TERRITORIO

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

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

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

• EVALUATE SUCTION and CORRECT EFFECTIVE STRESS
• ADOPTED MODEL
• MK KOVACS (Aubertin et al., 2003)
• granular soil f(D10, CU)
• fine soil f(LL)

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EFFECT OF CORRECTION (Ic) - BRONI
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ROBERTSON CAMPANELLA (1986)ROBERTSON (1990)
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EFFECT OF CORRECTION (SBT) BRONI
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EFFECT OF CORRECTION (SBT) BRONI
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LOOSE SILTY MIXTURES Qc lt 1 MPa
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SERCHIO RIVER EMBANKMENTS
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Ic FROM BOREHOLES VS. Ic FROM CPTU
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Ic FROM BOREHOLES CPTU
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EFFECT OF CORRECTION
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EFFECT OF CORRECTION
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HOW TO DISTINGUISH LOOSE SILT MIXTURES FROM
COMPRESSIBLE CLAYS ETC.

• COMPRESSIBLE CLAYS, PEATS, ETC. CAN HAVE qc lt 1
  MPa
• MAY FR GIVE USEFUL INDICATIONS?
• FRICTION RATIO lt 4?

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COMPRESSIBLE CLAYS PISA EST
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COMPRESSIBLE CLAYS PISA WEST
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COMPRESSIBLE CLAYS PISA DISTRICT
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COMPRESSIBLE CLAYS LIVORNO DISTRICT
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COMPRESSIBLE CLAYS LUCCA DISTRICT
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COMPRESSIBLE CLAYS PRATO DISTRICT
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COMPRESSIBLE CLAYS GROSSETO DISTRICT
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EFFECT OF SLEEVE DIAMETER (HOSKIN ET AL.,
2014)(NZ - SANDS)
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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)