Experimental and Numerical Observations of the Frequency-Domain Method in Bender-Element Testing

Tauta, Javier Fernando Camacho; Ali, Hassan; Cascante, Giovanni; Fonseca, António Viana da

doi:10.1061/(asce)gt.1943-5606.0001603

Cited by 20 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initial shear modulus G 0 is defined at an infinitesimally small shear strain, typically γ = 10 −6 , and can be measured in the laboratory using the BE and RC tests. According to the studies, the BE technique provides G 0 similar to that obtained with the RC technique (e.g., [10][11][12][13]). In addition, Sas et al [14] found that performing BE and RC tests separately may lead to a possible discrepancy in the determination of G 0 .…”

Section: Assessment Of Soil Stiffness At Small Strainsmentioning

confidence: 72%

Small Strain Shear Modulus of the Ljubljana Marsh Soil Measured with Resonant Column and Bender Elements under Isotropic and Anisotropic Stress Conditions

Jurček,

Pulko,

Maček

2024

Applied Sciences

View full text Add to dashboard Cite

The increasing use of finite element analysis in modern infrastructure design emphasizes the importance of determining soil stiffness at small strains. This is usually represented by the normalized shear modulus degradation curve, which is crucial for accurate design. In the absence of specific measurements on the local soil, engineers often rely on empirical correlations and assume comparable behavior of soils with similar intrinsic properties. However, the application of this approach leads to uncertainties, especially for unique geological formations such as the soft cohesive soils of the Ljubljana Marsh. The main objective of this study was to determine the small strain shear modulus of Ljubljana Marsh soil with a plasticity index between 11 and 35%. Isotropic and anisotropic stress conditions were investigated as part of an extensive laboratory test program that included 45 bender element and 89 resonant column tests on 20 soil samples. By emphasizing the importance of measuring soil stiffness at small strains, this study not only provides reliable data for the development of the built environment in the Ljubljana Marsh and similar areas, but also underlines its necessity.

show abstract

Section: Assessment Of Soil Stiffness At Small Strainsmentioning

confidence: 72%

Small Strain Shear Modulus of the Ljubljana Marsh Soil Measured with Resonant Column and Bender Elements under Isotropic and Anisotropic Stress Conditions

Jurček,

Pulko,

Maček

2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…where ρ is the mass density of the soil sample. The strain level at which G max is determined from the BE tests is less than 10 (Viggiani and Atkinson 1995;Arulnathan et al 1998;Lee and Santamarina 2005;Greening et al 2003;Blewett et al 2000;Greening and Nash 2004;Viana Da Fonseca et al 2009, Camacho-Tauta et al 2016). Out of these, the most common and simplest method of estimating t s is to identify the time of first arrival of the output voltage signal and subtract from that the time at which the input voltage signal starts (Dyvik and Madshus 1985;Jamiolkowski et al 1995).…”

Section: Bender Element Methodsmentioning

confidence: 99%

Low-strain dynamic characterization of undisturbed Leda clay

Irfan¹,

Cascante²,

Basu³

et al. 2022

Can. Geotech. J.

Self Cite

View full text Add to dashboard Cite

The low-strain dynamic behavior of Leda clays is investigated using the resonant column (RC) and bender element (BE) tests. Four undisturbed, lightly overconsolidated Leda clay samples, collected from two sites near the St-Lawrence River valley, are tested at different strains, confining stresses, and frequencies. To evaluate the effect of excitation frequency, simultaneous measurements of shear wave velocity using RC and BE tests are performed. The results show that the samples from the different sites behave differently. The high sensitivity of the Leda clays does not have a significant effect on the modulus degradation curves. However, the measured degradation curves are similar to those of soft clays with high plasticity, which is contrary to the expected behaviour of these low plasticity (Ip = 6.2-20) specimens. Likewise, the measured damping ratios are on the lower end of the typical values reported for soils of high plasticity. Low values of damping ratio make the amplification of small seismic events more likely in Leda clay deposits. The difference in the shear wave velocity measurements from RC and BE tests ranges from 17% to 26% depending on the confinement, likely because of the strong influence of P-waves observed in the BE tests for these soils.

show abstract

“…1), which may cause the output signal to be considerably different from the input signal [7,8]. Four classes of interpretation techniques have been reported to date: (i) direct observation of the arrival time on the output signal [9]; (ii) cross-correlation of the input and output signals [10,11]; (iii) frequency domain methods [12]; and, (iv) model-based methods [7,13]. Direct observation and cross-correlation methods work with input signals compactly supported in time, typically harmonic pulses at resonant frequencies [14].…”

Section: Introductionmentioning

confidence: 99%

“…A plot with the number of wavelengths as a function of the excitation frequency is used to find the travel time [15]. The method assumes that the transformation between input and output signals is only governed by the geomechanical properties of the material, which is generally not the case due to the distortion and reflection of the travelling waves, caused by the other constituents of the testing apparatus [12]. A model-updating method for the automatic calculation of the shear modulus was recently suggested in Ref.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of receiver's location in bender element experiments using computational wave filtration

Moldovan

Correia

2021

Soil Dynamics and Earthquake Engineering

View full text Add to dashboard Cite

Experimental and Numerical Observations of the Frequency-Domain Method in Bender-Element Testing

Cited by 20 publications

References 16 publications

Small Strain Shear Modulus of the Ljubljana Marsh Soil Measured with Resonant Column and Bender Elements under Isotropic and Anisotropic Stress Conditions

Small Strain Shear Modulus of the Ljubljana Marsh Soil Measured with Resonant Column and Bender Elements under Isotropic and Anisotropic Stress Conditions

Low-strain dynamic characterization of undisturbed Leda clay

Optimisation of receiver's location in bender element experiments using computational wave filtration

Contact Info

Product

Resources

About