Defining the soil stratigraphy from seismic piezocone data: A clustering approach

Molina-Gómez, Fausto; Fonseca, António Viana da; Ferreira, Cristiana; Sousa, Fernanda; Bulla-Cruz, Lenin Alexander

doi:10.1016/j.enggeo.2021.106111

Cited by 9 publications

(2 citation statements)

References 75 publications

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“…From Figure 2, it can be observed layers composed of granular soils (i.e., Ic < 2.6) at 3 m to 5 m, 6 m to 15 m and 17 m to 21 m depth in both profiles. The soil profiles exhibit lenses/transitions of clayey soils between the sandy layers, which are typical in alluvial deposits [21]. Based on the in situ characterisation, integral samples of sandy soil (hereafter called Av-sand) were collected at 4 m depth for the assessment of liquefaction resistance in the laboratory.…”

Section: Experimental Sitementioning

confidence: 99%

Cyclic Liquefaction Resistance of an Alluvial Natural Sand: A Comparison between Fully and Partially Saturated Conditions

Cordeiro¹,

Molina-Gómez²,

Ferreira³

et al. 2022

Geotechnics

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Earthquake-induced liquefaction is one of the major causes of building damage as it decreases the strength and stiffness of soil. The liquefaction resistance of soils increases significantly as the degree of saturation decreases, making soil desaturation an effective measure for the mitigation of this phenomenon. This paper presents a comparative analysis of liquefaction resistance of an alluvial sand from Aveiro (Portugal) under fully and partially saturated conditions. For this purpose, an in situ characterisation based on CPTu and a laboratory series of cyclic triaxial tests were carried out. The cyclic triaxial tests were conducted under undrained conditions on remoulded specimens with different degrees of saturation, including the full saturation. On the other hand, the triaxial apparatus was instrumented with Hall-effect transducers to accurately measure the strains during all testing phases. In addition, it was equipped with piezoelectric transducers to measure seismic waves velocities, namely P-wave velocity, for evaluation of the saturation level of the specimen in parallel with the Skempton’s B parameter. Hence, relations between the B-value, and P-wave velocity and cyclic strength resistance are presented. The number of cycles to trigger liquefaction, considering the pore pressure build-up criterion, is presented for the different degrees of saturation. Results confirmed the increase in liquefaction resistance for lower degrees of saturation in this soil.

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Section: Experimental Sitementioning

confidence: 99%

Cyclic Liquefaction Resistance of an Alluvial Natural Sand: A Comparison between Fully and Partially Saturated Conditions

Cordeiro¹,

Molina-Gómez²,

Ferreira³

et al. 2022

Geotechnics

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show abstract

“…To maintain generality, clustering cannot be based on some aprioristic criteria, like soil USCS category, but should emerge from the database itself. Data clustering is a generic data-management technique with many applications; in a geotechnical context it has been used, for instance, for CPTu-based stratigraphic delineation (Molina-Gómez et al, 2021). There are many different clustering methods (Everitt et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Bayesian Mixture Analysis of a Global Database to Improve Unit Weight Prediction from Cptu

collico¹,

Arroyo²

2022

SSRN Journal

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Importance of the Geotechnical Variability in the Bearing Capacity of Shallow Foundations Through Random Fields

Mendoza

Hurtado

Paredes

2022

Proceedings of the 4th International Conference on Numerical Modelling in Engineering

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Defining the soil stratigraphy from seismic piezocone data: A clustering approach

Cited by 9 publications

References 75 publications

Cyclic Liquefaction Resistance of an Alluvial Natural Sand: A Comparison between Fully and Partially Saturated Conditions

Cyclic Liquefaction Resistance of an Alluvial Natural Sand: A Comparison between Fully and Partially Saturated Conditions

Bayesian Mixture Analysis of a Global Database to Improve Unit Weight Prediction from Cptu

Importance of the Geotechnical Variability in the Bearing Capacity of Shallow Foundations Through Random Fields

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