Dyadic wavelet analysis of bender element signals in determining shear wave velocity

Guan, Chen; Wang, Fangtong; Li, Dianqing; Liu, Yong

doi:10.1139/cgj-2019-0167

Cited by 12 publications

(5 citation statements)

References 10 publications

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“…After the response spectrum surface is calculated by the program, it can be used to analyze the time-domain response of the building structure. Previous studies only used the maximum value of the acceleration response [7][8][9][10][11], and could not use the response spectrum for time-domain analysis, which is reflected in the seismic codes of various countries that use the response spectrum curve. Therefore, this study used the response spectrum for time-domain analysis of building structures after extending the response spectrum to the time domain.…”

Section: Applicationmentioning

confidence: 99%

An Analytical Method for Elastic Seismic Response of Structures Considering the Effect of Ground Motion Duration

Liang

Zhao

et al. 2021

Applied Sciences

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The response to earthquake ground motion is composed of three basic elements, namely, amplitude, frequency, and duration. The seismic response of a structure is controlled by the particular combination of these three elements. The seismic response spectra reflect the earthquake ground motion’s frequency-domain features and provide the maximum response amplitude of a single-degree-of-freedom system to a given earthquake ground motion but do not consider the duration factor. However, the analysis of post-earthquake damage shows that the seismic response duration has a strong impact on the damage to structures. Therefore, it is necessary to develop a simple and practical analytical method to account for the seismic response duration. The present study was conducted based on the response spectra theory. We introduce an analytical method of elastic seismic response, which considers its duration by adding the time-domain dimension of earthquakes. The time-domain spectral matrix is used to solve the time-dependent seismic response through the vibration mode decomposition method. The time-domain vibration mode decomposition reaction spectrum not only takes into account the maximum seismic reaction of each vibration mode but also considers the seismic reaction of different vibration modes occurring at the same time, at each moment. The dynamic time duration of the structure’s seismic reaction is quantified by the time-domain seismic reaction spectrum to obtain a more accurate analysis method for the seismic reaction of the structure.

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Section: Applicationmentioning

confidence: 99%

An Analytical Method for Elastic Seismic Response of Structures Considering the Effect of Ground Motion Duration

Liang

Zhao

et al. 2021

Applied Sciences

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“…There is some noise in the elastic wave signal received by bender-element-type piezoelectric transducers due to the interference of many factors [12][13][14][15]. These high-frequency noises usually lead to errors in analyzing information such as wave velocity, amplitude, and frequency.…”

Section: Introductionmentioning

confidence: 99%

Elastic Wave Denoising in the Case of Bender Elements Type Piezoelectric Transducers

Xie

Liu

2022

Sustainability

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The accuracy of the wave signal is key to studying physical information inside the soil using bender-element-type piezoelectric transducers. There is too much noise during the elastic wave signal collected by bender elements, which is caused by factors such as fluid current and infiltration. At present, the mainstream method is the superposition method, which superposes multiple tested waveform data to obtain a clear waveform. However, the superposition method is limited by the number of signals during the collection, and the denoised waveform still contains high-frequency noise. A combination method combining superposition and the wavelet threshold is proposed in this work to improve the accuracy of the elastic waveform signal. Three different signal denoising simulation tests and one model box test are conducted to verify the method’s feasibility from two aspects. The results show that the combined method can effectively remove high-frequency noise and display clear waveforms based on overcoming the number of signals. This work provides a new means of signal denoising in the case of studying soil properties by bender-element-type piezoelectric transducers.

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“…On the other hand, the consolidation of saturated soils is governed by the effective stress, as it relates to the soil's stiffness property [33] The effective stress combines the applied stress and water pore pressure, enabling the conversion of a multiphase porous medium to an equivalent single-phase continuous one [34,35]. Likewise, [36] established that effective stress can also describe the consolidation and SWRC behavior of unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic Coupled Model of Saturated Soil Consolidation under Effective Stress

Galaviz-González

Rangel

Limón-Covarrubias

et al. 2022

Water

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Soil’s consolidation is a geotechnical problem resulting from a stress-transfer process that initiates when the load is applied to the water contained in the soil, producing a reduction in pore water pressure and rearranging the solid particles, and thus causing a decrease in soil volume. Therefore, consolidation is a coupled flow–mechanical problem. Coupled models have been developed to simulate this phenomenon while considering different theories, providing consistent results. This paper presents an elastoplastic coupled model of consolidation under Terzaghi’s effective stress formulated using the equations of transient flow, balance moment, motion, and the critical state model that considered elastoplastic strains. The coupled model algorithm provided fast and easy results due to its flexibility, as it allowed combinations in loading and boundary conditions. Additionally, it considered the external/internal water flow as an inflow or outflow, which modified the pore water pressure and produced changes in the horizontal and vertical displacements. The numerical results obtained showed an appropriate behavior of the consolidation phenomenon, as well as the evolution of the vertical Uy and horizontal Ux isplacements, water pressure pw, volumetric εv and deviatoric εq strain, mean σp and deviatoric σq stress, volumetric variation Δεv, and elastic/plastic behavior of the finite elements while considering the yield surface of the critical state.

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Dyadic wavelet analysis of bender element signals in determining shear wave velocity

Cited by 12 publications

References 10 publications

An Analytical Method for Elastic Seismic Response of Structures Considering the Effect of Ground Motion Duration

An Analytical Method for Elastic Seismic Response of Structures Considering the Effect of Ground Motion Duration

Elastic Wave Denoising in the Case of Bender Elements Type Piezoelectric Transducers

Elastoplastic Coupled Model of Saturated Soil Consolidation under Effective Stress

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