Measurement of soil shear wave velocity using in situ and laboratory seismic methods – some methodological aspects

Godlewski, Tomasz; Szczepański, Tomasz

doi:10.7306/gq.1182

Cited by 10 publications

(11 citation statements)

References 4 publications

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“…4. Graph of the GDMT/G0 (left) and G0/MDMT indicator (right) vs KD for chosen types of soils [18] with modifications.…”

Section: Results From Sdmtmentioning

confidence: 99%

“…Currently, apart from the standard DMT test, the tests involving geophysical measurements with a dilatometer with a seismic sensor (SDMT) have been often performed. More information on the procedure itself and factors affecting the reliability of obtained results can be found in [33] and [18], [19]. These tests allow for determination of the soil rigidity profile as a function of shear modulus (G0) by measuring the propagation velocity of a transverse wave (Vs…”

Section: Shear Modulus From Sdmtmentioning

confidence: 99%

“…Generated vibrations had a frequency of less than 4 kHz. Thanks to that, the ratio of sample height to wave length L/O was higher than 3 [18], which allowed to eliminate factors that might have affected the results. For the analysis of the signal, visual interpretation was used, using a method described as "major first peak" by Lee and Santamarina [28].…”

Section: Reference Laboratory Testmentioning

confidence: 99%

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Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Godlewski

2018

Archives of Civil Engineering

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Increasingly complex design systems require an individual approach when determining the necessary design parameters. As soils are characterized by strong strain-dependent nonlinearity, test methods used to characterize the subsoil should be carefully selected, in terms of their “sensitivity” as well as suitability for the analyzed type of problem. When direct measurements are not available, while design calculation models require specific parameters, indirect parameter estimation may be used. This approach requires calibration and validation of empirical correlations, based on well documented database of tests and case studies. One of the parameters often used, when analyzing soil-structure interaction problems, is the shear stiffness of the soil and its strain-dependent degradation. The aim of the article is to present the procedure for description and evaluation of soil stiffness based on field tests (CPTU, DMT and SDMT) and a large number of reference curves obtained from laboratory tests (TRX) for selected soil types. On the basis of the given algorithm, it is possible to obtain a stiffness module G0 value at any level of deformation, based on in-situ tests.

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“…4. Graph of the GDMT/G0 (left) and G0/MDMT indicator (right) vs KD for chosen types of soils [18] with modifications.…”

Section: Results From Sdmtmentioning

confidence: 99%

Section: Shear Modulus From Sdmtmentioning

confidence: 99%

Section: Reference Laboratory Testmentioning

confidence: 99%

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Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Godlewski

2018

Archives of Civil Engineering

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“…Of particular relevance to foundation engineering is the shear wave velocity, Vs, which can be related directly to the in-situ stiffness of the ground through which the shear waves travel. Vs can be measured directly via in-situ geophysical methods, for example, as described by Godlewski and Szcezepanski (2015). They identify three broad approaches to in-situ measurement:…”

Section: Assessment Of Shear Wave Velocity Vs Direct In-situ Measurementsmentioning

confidence: 99%

Use of Shear Wave Velocity for Foundation Design

Poulos¹

2021

Geotech Geol Eng

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This paper describes an approach for utilizing in-situ measurements of shear wave velocity Vs to carry out preliminary and check design calculations for shallow and deep foundations. For estimates of foundation movements, Vs can be used directly to estimate the small-strain stiffness of the soil or rock strata, while for ultimate capacity calculations, use is made of empirical correlations between Vs and penetration resistance measures, which in turn are correlated to the foundation resistance characteristics. The approach is applied to a series of published tests on shallow footings, and on a series of pile load tests for a very tall building. For these cases, comparisons of the calculated with the measured loadsettlement behaviour indicates that the suggested approach provides a reasonable, albeit somewhat conservative, level of agreement.

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“…[1][2][3][4][5][6][7]), Polish ones among them -e.g. Świdziński, Jastrzębska [8][9][10][11][12][13][14][15]. for soil stiffness characteristics [13] It would be appropriate here to reference the representative graph of soil stiffness characteristic, a result of research of multiple scholars (figure 1).…”

Section: Introduction -Problem Descriptionmentioning

confidence: 99%

Recreation of Small Strains Phenomenon under Pavement Structure and Consequences of Failure to Address It

Fedorowicz

Kadela

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. This paper describes the small strains phenomenon which occurs in the subgrade under a pavement, a phenomenon documented through in-situ tests and recreated in numerical analyses, which lends a practical engineering aspect to the subject matter. The analyses were preceded by: 1) presentation of the role of constitutive models in structure-subgrade system analysis, 2) reference to methods of modelling in mechanistic procedures and possibility of reliable assessment of criterial values in road structures. These studies were coupled with a description of field tests, which recorded strains in subgrade under a loaded pavement: in zone I directly under the pavement -variable, depending on stiffness of the pavement and the load (about 200÷1000.10-6) and below that, in zone II -'stabilised' (about 1÷5.10-6). In summary, it has been found that the accuracy of numerical analyses of structure-subgrade systems is dependent on the adopted constitutive model of the soil and the numerical calculation area representing the subgrade. Recreation and analysis of the pavement-subgrade system behaviour employed the MCC(OC) critical state model. It was determined that a reliable response of the computational model to the load path used can be obtained with a model that has been previously properly calibrated. The paper justifies the need to carry out further, directed field tests, coupled with numerical analyses employing relevant constitutive models for description of the soil's performance.

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Measurement of soil shear wave velocity using in situ and laboratory seismic methods – some methodological aspects

Cited by 10 publications

References 4 publications

Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Use of Shear Wave Velocity for Foundation Design

Recreation of Small Strains Phenomenon under Pavement Structure and Consequences of Failure to Address It

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