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

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

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

4. 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)

5. EFFECT OF CORRECTION (Ic): - BRONI

6. ROBERTSON & CAMPANELLA (1986) ROBERTSON (1990)

7. EFFECT OF CORRECTION (SBT): BRONI

9. LOOSE SILTY MIXTURES: Q c < 1 MPa

10. SERCHIO RIVER EMBANKMENTS

11. I c FROM BOREHOLES VS. I c FROM CPTU

12. Ic FROM BOREHOLES & CPTU

13. EFFECT OF CORRECTION

15. 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?

16. COMPRESSIBLE CLAYS: PISA EST

17. COMPRESSIBLE CLAYS: PISA WEST

18. COMPRESSIBLE CLAYS: PISA DISTRICT

19. COMPRESSIBLE CLAYS: LIVORNO DISTRICT

20. COMPRESSIBLE CLAYS: LUCCA DISTRICT

21. COMPRESSIBLE CLAYS: PRATO DISTRICT

22. COMPRESSIBLE CLAYS: GROSSETO DISTRICT

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

24. 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)