The current piezocone penetration test (PCPT) interpretation methods were evaluated for their capability to estimate the vertical coefficient of consolidation (cv) of cohesive soils reasonably by using the piezocone dissipation tests. Seven PCPT methods were evaluated. Six sites in Louisiana were selected for this study. At each site, in situ PCPT tests were performed, and soundings of cone tip resistance, sleeve friction, and pore pressures at different locations were recorded. Piezocone dissipation tests also were conducted at different penetration depths. High-quality Shelby tube samples were collected close to the PCPT tests and were used to carry out a comprehensive laboratory testing program. The (cv) values predicted by the different interpretation methods were compared with the reference values determined from the oedometer laboratory tests. The results of this study showed that two methods can estimate cv better than the other prediction methods.
References
1.
RoweP. W., and BardenL.A New Consolidation Cell, Geotechnique, Vol. 16, No. 2, 1966, pp. 162–170.
2.
RoweP. W.The Relevance of Soil Fabric to Site Investigation Practice, Geotechnique, Vol. 22, No. 2, 1972, pp. 195–200.
3.
GrisakG. E., and CherryJ. A.Hydrologic Characteristics and Response of Fractured Till and Clay Confining a Shallow Aquifer, Canadian Geotechnical Journal, Vol. 12, No. 1, 1975, pp. 23–43.
4.
BalighM. M., and LevadouxJ. N.Consolidation After Undrained Piezocone Penetration. II: Interpretation, Journal of Geotechnical Engineering, Vol. 112, No. 7, 1986, pp. 727–745.
5.
TehC. I., and HoulsbyG. T.An Analytical Study of the Cone Penetration Test in Clay, Geotechnique, Vol. 41, No. 1, 1991, pp. 17–34.
6.
LevadouxJ. N., and BalighM. M.Consolidation After Undrained Piezocone Penetration. II: Interpretation, Journal of Geotechnical Engineering, Vol. 112, No. 7, 1986, pp. 727–745.
7.
RobertsonP. K., and CampanellaR. G.Guidelines for Geotechnical Design Using CPT and CPTU. Soil Mechanics Series 120. Department of Civil Engineering, University of British Columbia, Vancouver, Canada, 1988.
8.
TehC. I.An Analytical Study of the Cone Penetration Test. D.Ph. thesis. Oxford University, United Kingdom, 1987.
9.
SennesetK., JanbuK., and SvanoG.Strength and Deformation Parameters from Cone Penetration Tests, Proc., 2nd European Symp. on Penetration Testing, ESOPT II, Amsterdam, Netherlands, Vol. 2, Balkema Publishers, Rotterdam, Netherlands, 1982, pp. 863–870.
10.
JonesG. A., and RustE.Piezocone Settlement Prediction Parameters for Embankments on Alluvium, Proc., International Symposium on Penetration Testing, CPT 95, Linköping, Sweden, Vol. 2, Swedish Geotechnical Society, Linköping, 1995, pp. 501–508.
11.
TorstenssonB. A.The Pore Pressure Probe. Paper 34. Presented at Geotechnical Meeting, Norwegian Geotechnical Society, Oslo, Norway, 1977, pp. 34.1–34.15.
12.
VesicA. S.Expansion of Cavities in Infinite Soil Mass, Journal of Soil Mechanics and Foundation Division, Vol. 98, No. 3, 1972, pp. 265–290.
13.
ElsworthD.Analysis of Piezocone Dissipation Data Using Dislocation Method, Journal of Geotechnical Engineering, Vol. 119, No. 10, 1993, pp. 1601–1623.
14.
BurnsS. E., and MayneP. W.Monotonic and Dilatory Pore Pressure Decay During Piezocone Tests in Clay, Canadian Geotechnical Journal, Vol. 35, No. 6, 1998, pp. 1063–1073.
15.
LunneT., RobertsonP. K., and PowellJ. J.Cone Penetration Testing in Geotechnical Practice, Taylor & Francis Group, London, 1997.
16.
DuncanM. J., and BuchignaniA. L.An Engineering Manual for Settlement Studies.University of California at Berkeley, 1976.
17.
JamiolkowskiM., LaddC. C., GermaineJ. T., and LancellottaR.New Developments in Field and Laboratory Testing of Soils, State-of-the-Art Report, Proc., 11th International Conference on Soil Mechanics and Foundation Engineering, San Francisco, Calif., Vol. 1, Balkema Publishers, Rotterdam, Netherlands, 1985, pp. 57–153.
18.
SullyJ. P., RobertsonP. K., CampanellaR. G., and WoellerD. J.An Approach to Evaluation of Field CPTU Dissipation Data in Overconsolidated Fine-Grained Soils, Canadian Geotechnical Journal, Vol. 36, No. 2, 1999, pp. 369–381.
19.
Abu-FarsakhM. Y.Evaluation of Consolidation Characteristics of Cohesive Soils from Piezocone Penetration Tests. Report No. FHWA/ LA.04/386. Louisiana Transportation Research Center, Baton Rouge, La., 2004.
20.
ZhangZ., and TumayM. T.Statistical to Fuzzy Approach Toward CPT Soil Classification, Journal of Geotechnical and Environmental Engineering, Vol. 125, No. 3, 1999, pp. 179–186.
21.
KabirM. G., and LuteneggerA. J.Discussion of Preconsolidation Pressure from Piezocone Tests in Marine Clays, Geotechnique, Vol. 38, No. 3, 1988, pp. 455–460.
22.
RobertsonP. K., SullyJ. P., WoellerD. J., LunneT., PowellJ. J., and GillespieD. G.Estimation of Consolidation from Piezocone Tests, Canadian Geotechnical Journal, Vol. 29, No. 4, 1992, pp. 539–550.
