Prediction of Soil Properties from the Concepts of Energy Transfer in Dynamic Penetration Tests

Schnaid, Fernando; Odebrecht, Edgar; Rocha, Marcelo Maia; Bernardes, George de Paula

doi:10.1061/(asce)gt.1943-5606.0000059

Cited by 21 publications

(40 citation statements)

References 16 publications

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“…Panda; [1]). Of these, the Standard Penetration Test (SPT) remains as one of the most popular in-situ testing procedures [2], frequently used to estimate soil properties [62,18], foundation design parameters and evaluate liquefaction potential [49].…”

Section: Introductionmentioning

confidence: 99%

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Standard penetration testing in a virtual calibration chamber

Arroyo¹,

Ciantia

Gens³

et al. 2019

Computers and Geotechnics

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The virtual calibration chamber technique, based on the discrete element method, is here applied to study the standard penetration test (SPT). A macro-element approach is used to represent a rod driven with an impact like those applied to perform SPT. The rod is driven into a chamber filled with a scaled discrete analogue of a quartz sand. The contact properties of the discrete analogue are calibrated simulating two low-pressure triaxial tests. The rod is driven changing input energy and controlling initial density and confinement stress. Energy-based blowcount normalization is shown to be effective. Results obtained are in good quantitative agreement with well-accepted experimentally-based relations between blowcount, density and overburden. It is also shown that the tip resistance measured under impact dynamic penetration conditions is close to that under constant velocity conditions, hence supporting recent proposals to relate CPT and SPT results.

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Section: Introductionmentioning

confidence: 99%

“…Some, like the torsional SPT or SPT-T [13], require extra specific procedural steps. Perhaps more interesting are those that obtain extra results from the same procedure, for instance through interpretations of SPT based on penetration per blow, ∆ρ, [2] or enhanced dynamic data acquisition for light dynamic penetrometers [14].…”

Section: Introductionmentioning

confidence: 99%

Standard penetration testing in a virtual calibration chamber

Arroyo¹,

Ciantia

Gens³

et al. 2019

Computers and Geotechnics

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show abstract

“…In addition, these estimates are performed based on empirical correlations without any scientific basis. Researchers and practitioners highlight that it is possible to increase the N SPT index accuracy by observing recommended standards and using a more skilled and experienced field crew (Schnaid et al, 2009;Reading et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Energy Ratio (ER) for the Standard Penetration Test Based on Measured Field Tests

Lukiantchuki¹,

Bernardes²,

Esquivel³

2017

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Abstract. The Standard Penetration Test (SPT) is often used to estimate the soil parameters for geotechnical design projects, using the N SPT index. However, these estimates are performed based on empirical correlations without any scientific basis. Moreover, the test has a large inherent results dispersion due to the use of different types of equipment and execution procedures. Since the N SPT index depends on the amount of energy that is effectively transmitted to the sampler during the hammer fall, it is fundamental to be able to estimate this energy. Given the importance of estimating the energy that reaches the SPT sampler, an instrumented subassembly was developed in order to simultaneously assess the amount of energy transmitted to the drill rods, at sections just above the sampler and just below the anvil. This paper presents a series of SPT experimental results carried out in two different sites located in the State of São Paulo, using two different equipment set-ups (with manual and automatic tripping mechanisms), enabling the assessment of the top and bottom energy ratio under different conditions. Results show that for hand lifting hammer and automatic trip hammer systems the difference in the energy ratio is not significant. However, the dispersion of the results for the hand lifting hammer system is more pronounced due to execution procedures, equipment and operators.

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“…Tensão vertical efetiva na parte inferior do solo modelado x: (Schnaid et al, 2009). Para fins de dimensionamento de estacas podese obter a resistência unitária de ponta e de atrito lateral também a partir da medição da energia nos ensaios.…”

Section: V1unclassified

“…Ainda segundo Schnaid et al (2009), é importante obter a força dinâmica teórica (Fd), pois, a interpretação das propriedades do solo, tanto em areias como em argilas, baseada nesta força, permite a avaliação de parâmetros do solo.…”

Section: Resistência Dinâmica Mobilizada Durante a Cravação Do Amostrunclassified

Modelagem numérica dos fenômenos que ocorrem durante a penetração do amostrador SPT no solo

Baños¹,

Paola²

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Prediction of Soil Properties from the Concepts of Energy Transfer in Dynamic Penetration Tests

Cited by 21 publications

References 16 publications

Standard penetration testing in a virtual calibration chamber

Standard penetration testing in a virtual calibration chamber

Energy Ratio (ER) for the Standard Penetration Test Based on Measured Field Tests

Modelagem numérica dos fenômenos que ocorrem durante a penetração do amostrador SPT no solo

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