Evaluation of consolidation characteristics of cohesive soils from piezocone penetration tests.
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Evaluation of consolidation characteristics of cohesive soils from piezocone penetration tests.

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English
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  • Creators:
    Abu-Farsakh, Murad Y.
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/LA.03/386
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    The piezocone penetration test (PCPT) has gained wide popularity and acknowledgement as a preferred in-situ device for subsurface investigation and soil characterization. The PCPT measurements can be utilized for soil identification and the evaluation of different soil parameters. Different interpretation methods have been proposed to evaluate the strength and consolidation parameters of cohesive soils utilizing the piezocone penetration and dissipation test data. This report presents the evaluation of the capability of the current PCPT interpretation methods to reasonably predict the consolidation parameters needed to predict the total and time rate of settlement of cohesive soils. Seven sites in Louisiana were selected for this study. In each site, in-situ PCPT tests were performed and soundings of cone tip resistance (qc), sleeve friction (fs) and pore pressures (u1 and u2) were recorded. Dissipation tests were also conducted at different penetration depths. High quality shelby tube samples were collected close to the PCPT tests and used to carry out a comprehensive laboratory testing program including unconfined compression test, triaxial test and one-dimensional oedometer consolidation test. The tangent constrained modulus (M), overconsolidation ratio (OCR) and the vertical coefficient of consolidation (cv), predicted using the different interpretation methods, were compared with the reference values determined from the laboratory consolidation tests. Results of this study showed that the consolidation parameters of soils can be reasonably predicted from the piezocone penetration and dissipation test data, and hence provide a continuous profile of these parameters with depth. The results of this study were verified by comparing the predicted settlements from PCPT methods with the laboratory calculated and field measured settlements in three selected sites.
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    PDF
  • Funding:
    00-3GT
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