Dynamic properties of two historically liquefiable sands in the Lisbon area

Molina-Gómez, Fausto; Fonseca, António Viana da; Ferreira, Cristiana; Tauta, Javier Fernando Camacho

doi:10.1016/j.soildyn.2020.106101

Cited by 17 publications

(10 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thickness of the cover layers of the wind farm involved in this test is within 30 m, and the pore characteristics of the silty and medium sand layers investigated in the test do not change obviously with the depth, so it has a limited effect on the shear modulus. In addition, the reliability of the model is verified based on the shear modulus test data of liquefiable sand by Castelli et al [39] and Molina-Gómez [40]. The parameters used in fitting are shown in Table 6.…”

Section: Nonlinearity Of Dynamic Shear Modulusmentioning

confidence: 84%

Experimental Study on Stiffness Degradation and Liquefaction Characteristics of Marine Sand in the East Nan-Ao Area in Guangdong Province, China

Liang

Zhang

Wang

et al. 2021

JMSE

View full text Add to dashboard Cite

Offshore wind power, as an efficient renewable energy source, is being vigorously developed nowadays. However, the liquefaction of marine sand due to earthquakes brings potential safety hazards to the wind turbine structures. In this study, a series of resonant column and undrained cyclic triaxial tests were carried out to investigate the stiffness degradation and liquefaction characteristics of marine sand in the offshore wind farm at the East Nan-ao area in Guangdong Province (China). Results show that the confining pressure increases the shear modulus of sand and restrains the nonlinearity of modulus. The liquefaction resistance of soils significantly increases with the increase of relative density. The effect of particle size on the liquefaction resistance is related to the cyclic shear stress ratio. The additional pressure induced by the presence of the wind turbine structure enlarges the energy required for shallow soil liquefaction. Besides, a model for predicting shear modulus and another modified model based on Seed’s pore pressure development model have been established, which can efficiently fit the dynamic shear modulus and the generation of excess pore water pressures in the tests, respectively.

show abstract

Section: Nonlinearity Of Dynamic Shear Modulusmentioning

confidence: 84%

Experimental Study on Stiffness Degradation and Liquefaction Characteristics of Marine Sand in the East Nan-Ao Area in Guangdong Province, China

Liang

Zhang

Wang

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…Further studies would be required, such as a state-dilatancy interpretation, which is not the scope of this work. Dry pluviation (DP) is an effective method of achieving a wide range of target densities in sandy soils once the technique is calibrated [58][59][60]. DP methods result in a more contractive response and enhanced reverse behaviour than wet reconstitution methods [61].…”

Section: Specimen Preparation Methodsmentioning

confidence: 99%

Recommended Procedures to Assess Critical State Locus from Triaxial Tests in Cohesionless Remoulded Samples

2021

Self Cite

View full text Add to dashboard Cite

The critical state theory is a robust conceptual framework for the characterisation of soil behaviour. In the laboratory, triaxial tests are used to assess the critical state locus. In the last decades, the equipment and testing procedures for soil characterisation, within the critical state framework, have advanced to obtain accurate and reliable results. This review paper summarises and describes a series of recommended laboratory procedures to assess the critical state locus in cohesionless soils. For this purpose, results obtained in the laboratory from different cohesionless soils and triaxial equipment configurations are compiled, analysed and discussed in detail. The procedures presented in this paper reinforce the use of triaxial cells with lubricated end platens and an embedded connection piston into the top-cap, together with the verification of the full saturation condition and the measurement end-of-test water content—preferable using the soil freezing technique. The experimental evidence and comparison between equipment configurations provide relevant insights about the laboratory procedures for obtaining a reliable characterisation of the critical state locus of cohesionless geomaterials. All the procedures recommended herein can be easily implemented in academic and commercial geotechnical laboratories.

show abstract

“…For this study, a series of soil specimens were prepared using mainly the dry pluviation method, and a few samples were prepared using the moist tamping method. The dry pluviation method ensures reasonably homogeneous specimens with an initial soil fabric that is believed to be similar to the one encountered in alluvial soil deposits (Miranda et al, 2020;Molina-Go ´mez et al, 2020). The specimens prepared through the moist tamping method allowed evaluating differences concerning the initial soil fabric effects on the mechanical behaviour of TP-Lisbon sand.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The Vs results obtained from BE tests were contrasted against Vs values obtained from resonant-column (RC) tests reported by Molina-Go ´mez et al (2020). Such an RC apparatus corresponds to a Stokoe type -bottomfixed and top free configuration-equipped with an automatic system able to control all the testing phases.…”

Section: Stress-dependency Of Small-strain Stiffness In Tp-lisbon Sandmentioning

confidence: 99%

See 1 more Smart Citation

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

Molina-Gómez

Fonseca

Ferreira

et al. 2021

Engineering Geology

Self Cite

View full text Add to dashboard Cite

Dynamic properties of two historically liquefiable sands in the Lisbon area

Cited by 17 publications

References 28 publications

Experimental Study on Stiffness Degradation and Liquefaction Characteristics of Marine Sand in the East Nan-Ao Area in Guangdong Province, China

Experimental Study on Stiffness Degradation and Liquefaction Characteristics of Marine Sand in the East Nan-Ao Area in Guangdong Province, China

Recommended Procedures to Assess Critical State Locus from Triaxial Tests in Cohesionless Remoulded Samples

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

Contact Info

Product

Resources

About