Continuous Monitoring of Bender Element Shear Wave Velocities During Triaxial Testing

Styler, Mark A.; Howie, John A.

doi:10.1520/gtj20120098

Cited by 20 publications

(16 citation statements)

References 11 publications

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“…A number of methods for the analysis of bender element results are commonly used in the time or frequency domain [17,28]. The time domain methods are classified as direct measurements, which use plots of electrical signals versus time [19,29].…”

Section: Methods Of Interpretation Of Be Resultsmentioning

confidence: 99%

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Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

et al. 2016

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Abstract:The paper presents a description of the dynamic properties of cohesive material, namely silty clays, obtained by using one of the applied seismology methods, the bender elements technique. The authors' aim was to present the dynamics of a porous medium, in particular an extremely important passage of seismic waves that travel through the bulk of a medium. Nowadays, the application of the bender element (BE) technique to measure, e.g., small strain shear stiffness of soils in the laboratory is well recognized, since it allows for reliable and relatively economical shear wave velocity measurements during various laboratory experiments. However, the accurate estimation of arrival time during BE tests is in many cases unclear. Two different interpretation procedures (from the time domain) of BE tests in order to measure travel times of waves were examined. Those values were then used to calculate shear and compression wave velocities and elastic moduli. Results showed that the dynamic parameters obtained by the start-to-start method were always slightly larger (up to about 20%) than those obtained using the peak-to-peak one. It was found that the peak-to-peak method led to more scattered results in comparison to the start-to-start method. Moreover, the influence of the excitation frequency, the mean effective stress and the unloading process on the dynamic properties of the tested material was studied. In addition, the obtained results highlighted the importance of initial signal frequency and the necessity to choose an appropriate range of frequencies to measure the shear wave velocity in clayey soils.

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Section: Methods Of Interpretation Of Be Resultsmentioning

confidence: 99%

“…The time required for this process can be simply read off from an oscilloscope. On the basis of this value, shear wave velocity can be obtained [17]. Therefore, BEs are an inexpensive and versatile solution, which can be used for laboratory seismic measurement.…”

Section: (1 )mentioning

confidence: 99%

Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

et al. 2016

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“…This invasive approach can introduce undesirable sample disturbances thus affecting the dynamic properties of the rock. Insertion into stiff soil can also damage the waterproofing layers of the bender/extender elements which were usually made of epoxy (Brignoli et al 1996 or polyurethane (Deniz 2008, Styler andHowie 2014). Furthermore, it is almost impossible to achieve a good contact condition in stiff specimen thus leading to weak signal strength and poor data.…”

Section: Bender-extender Element Systemmentioning

confidence: 99%

Properties of soils using laboratory seismic methods and numerical modelling

Cheng¹

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CHAPTER 4: Finite Element Modelling 4.1 Outline and Purpose 4.2 Introduction to LS-DYNA 4.3 Calibration for stiffness response 4.3.1 The Timoshenko beam effect 4.3.2 Verification of the finite element model 102 4.3.3 Finite element simulation program 104 4.3.4 Correction factor for the Timoshenko beam effect 105 4.3.5 Validation of correction factor χ m 108 4.4 Calibration for damping response 114 4.4.1 The Viscoelastic material model 114 4.4.2 Input Parameters for Viscoelastic Model 118 4.4.3 Finite element simulation program 120 4.4.4 Calibration of viscoelastic model using simulated resonant column test 122 4.4.5 Wave Propagation in a semi-infinite medium 125 4.5 Simulations for the Verification of the Hilbert Transform Method 128

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“…Podczas każdego pomiaru analizowany był zarówno wysyłany jak i odbierany sygnał; porównywano częstotliwo-ści i amplitudy tych sygnałów. Szczegółowy opis aparatury i metodyki badań można znaleźć w pracach [4,5,6,7,8,9,10,11].…”

Section: Metodyka Badań W Aparacie Trójosiowymunclassified

Wyznaczanie Współczynnika Poisson’a Na Podstawie Pomiaru Prędkości Fal Akustycznych

et al. 2016

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Continuous Monitoring of Bender Element Shear Wave Velocities During Triaxial Testing

Cited by 20 publications

References 11 publications

Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

Properties of soils using laboratory seismic methods and numerical modelling

Wyznaczanie Współczynnika Poisson’a Na Podstawie Pomiaru Prędkości Fal Akustycznych

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