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CPT data in normally consolidated soils

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Abstract

The paper presents observations made in CPTs performed under controlled laboratory conditions in normally consolidated clay–sand mixtures at various penetrations. These results are combined with data from field tests to develop a relationship for CPT data in young normally consolidated soils that combines end resistance and friction sleeve data. This relationship can be used to assist assessment of soil type and CPT parameters for un-aged normally consolidated soils as well as allowing judgements to be made in relation to likely levels of under-consolidation, structure and over-consolidation in any given soil deposit.

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Abbreviations

c v :

Vertical coefficient of consolidation

D r :

Relative density

F r :

Friction ratio

f s :

Sleeve friction

G 0 :

Small strain shear stiffness modulus

I c :

CPT soil behaviour type index

I B :

CPT soil behaviour type index

OCR:

Over-consolidation ratio

q t :

Corrected cone tip resistance

p′0 :

Initial mean effective stress

v :

Cone penetration velocity

u 2 :

Pore pressure at the cone shoulder

V :

Normalised velocity

Δu 2/σ′vo :

Normalised pore pressure

σ′v :

Vertical effective stress

σ v :

Vertical total stress

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Acknowledgements

The first author is grateful for the financial support provided by the Australian Department of Foreign Affairs and Trade.

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Authors and Affiliations

  1. GWE Consulting Engineers, 25 Anzac St, Takapuna, Auckland, 0622, New Zealand

    L. V. Doan

  2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia

    L. V. Doan & B. M. Lehane

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  1. L. V. Doan
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  2. B. M. Lehane
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Correspondence to L. V. Doan.

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Doan, L.V., Lehane, B.M. CPT data in normally consolidated soils. Acta Geotech. 16, 2877–2885 (2021). https://doi.org/10.1007/s11440-021-01167-z

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