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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 on theme: "Nunziante Squeglia, Lo Presti Diego, Barbara Cosanti UNIVERSITA’ DI PISA Dipartimento di Ingegneria dell’Energia, dei Sistemi del Territorio e delle Costruzioni."— Presentation transcript:

1 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

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

8

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

14

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)


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