On the evaluation of undrained shear strength and preconsolidation pressure from common field tests in clay

Larsson, Rolf; Åhnberg, Helen

doi:10.1139/t05-031

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…Results from Swedish clays give similar values however the coefficients appear to trend with plasticity index (Larsson & Mulabdic 1991;Larsson & Åhnberg 2005), whereas the study involving clays of eastern Canada did not show such a trend (Demers & Leroueil 2002). …”

Section: Yield Stresses From Cptu In Soft Inorganic Claysmentioning

confidence: 82%

Stress History of Soils from Cone Penetration Tests

Mayne¹

2017

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Abstract. Stress history is an important measurement in soils as it affects strength, stability, stiffness, and flow characteristics. The evaluation of the in-situ preconsolidation stress, or effective yield stress, from the results of piezocone penetration tests allows for an economical and expedient means to profile the stress history of clays, sands, and mixed soil types on geotechnical projects. The methodology is based on a derived analytical cavity expansion -critical state solution for clays and statistical inversion of data from calibration chamber tests on sands. Applications are given for case studies involving clay, silt, and sand where laboratory consolidation tests provide benchmark values for the stress history. Since yield stress demarcates contractive vs. dilative soil behavior, extended uses in screening soil susceptibility for concerns involving flow and cyclic liquefaction are also presented.

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Section: Yield Stresses From Cptu In Soft Inorganic Claysmentioning

confidence: 82%

Stress History of Soils from Cone Penetration Tests

Mayne¹

2017

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“…Although the correlations developed in a given geological context are not universally applicable and should be used with caution, as well as be calibrated locally (Larsson & Ahnberg, 2005;Leroueil et al, 2001), empirical correlations between the undrained shear strength (S u ) and the plasticity index (I P ) can be used to support and complement strength determinations (Larsson et al, 1987). Some of these correlations are presented in Table 4.…”

Section: Empirical Correlationsmentioning

confidence: 99%

The Undrained Strength of Soft Clays Determined from Unconventional and Conventional Tests

Lemos¹,

Pires²

2017

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Abstract. The laboratory fall cone test, considered an unconventional test, was performed to estimate the undrained shear strength of undisturbed samples of Brazilian coastal soft clays with different plasticity index values. The undrained shear strength determined by laboratory fall cone test was compared with the strength determined by conventional field and laboratory tests commonly used to estimate this parameter in cohesive soils: piezocone test, field vane test, unconfined compression test, unconsolidated undrained triaxial compression test and laboratory vane test. The fall cone test undrained shear strength results presented good agreement with the laboratory vane test strength results and reasonable agreement with unconfined compression test strength results. The strength results obtained by laboratory tests were compared with the continuous strength profile estimated from the piezocone test calibrated using the field vane test, and presented good agreement with fall cone test and laboratory vane test strength results. The normalised undrained shear strength was compared with some empirical correlations reported in the literature based on plasticity index, being verified some behaviour similarity.

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“…The corrected value of s u in overconsolidated clay classified as 'normal inorganic Swedish clay' is calculated from FC or FVS tests as (Larsson and Å hnberg, 2005;Larsson et al, 2007a) …”

Section: Initial Ground Conditionsmentioning

confidence: 99%

Stability for a high embankment founded on sulfide clay

Müller

Larsson

Westerberg

2013

Proceedings of the Institution of Civil Engineers - Geotechnica

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During staged construction of embankments on clay foundations, the undrained shear strength su increases due to consolidation during the construction process. The increase is usually related to the pre-consolidation pressure [Formula: see text] by way of the ratio [Formula: see text] and is important when assessing the stability of an embankment. Properties controlling the increase are usually associated with various unknowns that can be difficult to predict before construction. A case involving a large embankment built on vertically drained sulfide clay is presented. Empirical knowledge and experience of similar constructions on sulfide clay were limited, therefore there were uncertainties of the soil–drain interaction and how the soil would behave under the embankment load. A trial embankment was built to gather knowledge and experience of this particular soil and the observational method was adopted. The study presents how embankment stability was predicted at design stage and controlled during construction. It highlights the importance and usefulness of obtaining measurement data from different types of measurements. Laboratory tests and a large number of in situ tests at different stages during construction were performed to assess [Formula: see text] ratios in the sulfide clay. The mean [Formula: see text] ratio was estimated by means of statistical analysis to 0·25 for a large stress interval.

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On the evaluation of undrained shear strength and preconsolidation pressure from common field tests in clay

Cited by 25 publications

References 9 publications

Stress History of Soils from Cone Penetration Tests

Stress History of Soils from Cone Penetration Tests

The Undrained Strength of Soft Clays Determined from Unconventional and Conventional Tests

Stability for a high embankment founded on sulfide clay

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