Seismic cone analysis using digital signal processing for dynamic site characterization

Campanella, Richard; Stewart, W. P.

doi:10.1139/t92-052

Cited by 61 publications

(51 citation statements)

References 6 publications

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“…Gary Mavko [49], on the other hand, in his study on Parameters That Influence Seismic Velocity mentions P-wave velocity for saturated clays as being in the range of 1100 to 2500 m¨s´1. Campanella and Steward [50] detailed typical speeds of longitudinal and transversal waves to a depth of 40 m. According to their research, compressive wave velocity for saturated soils may have values between 1500 and 1900 m¨s´1.…”

Section: The Effect Of Stress Levelmentioning

confidence: 99%

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: The Effect Of Stress Levelmentioning

confidence: 99%

Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

et al. 2016

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“…In this study, a Butterworth filter, which is a representative band-pass filter, is applied for efficient noise level control. To determine an adequate frequency range for band-pass filtering, an adopted coherence function (coh) can be a valuable tool for judgment (Campanella and Stewart 1992). The coherence, C xy , is defined as follows:…”

Section: Signal Post-processingmentioning

confidence: 99%

“…However, in cases where the shear wave signals are masked by reflected or refracted waves and (or) include external noise or disturbances, it may be difficult to pick accurate initial points. For the cross-over method, two consistent opposite direction (e.g., left and right) strikes are required, thus even one bad signal that does not have a symmetric shape might disturb and shift the exact cross-over point (Campanella and Stewart 1992;Liao and Mayne 2006). Notably, visual picking methods are not practical for a continuous V s dataset because of the large number of wavelets.…”

Section: Time Domain Analysismentioning

confidence: 99%

Continuous-interval shear wave velocity profiling by auto-source and seismic piezocone tests

MaynePaul

CargillEthan³

2013

Can. Geotech. J.

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A new exploratory procedure for collecting continuous shear wave velocity measurements via cone penetration testing using a special autoseis source is presented whereby wavelets can be generated and recorded every 1 to 10 s. The continuous-interval seismic piezocone test (CiSCPTu) offers a fast, productive, and reliable means to expedite the collection of downhole shear wave velocity profiles, as well as additional readings on cone tip resistance, sleeve friction, and penetration porewater pressures with depth. A site in Windsor, Virginia, is utilized for illustrating the collection of data, calibration, and post-processing issues arising from large numbers of wavelets that require filtering, windowing, and selection in both time and frequency domain analyses. At the test site, the geology consists of shallow Holocene deposits of clays and sands to 8 m that are underlain by much stiffer calcareous sandy marine clay soils of Miocene age, which extend beyond the termination depths of the soundings at 30 m.Résumé : Cet article présente une nouvelle procédure exploratoire servant à récolter des mesures de vitesse des ondes de cisaillement en continu à l'aide d'essais de pénétration du cône faits avec une source sismique spéciale. Cette procédure permet de générer et enregistrer les ondelettes toutes les 1 à 10 s. L'essai sismique à intervalle continu au piézocône (EPCic) offre une méthode rapide, productive et fiable pour récolter les données de profils de vitesse des ondes de cisaillement de trous de forage, ainsi que des données additionnelles sur la résistance de la pointe du cône, la friction de l'enveloppe et les pressions interstitielles de pénétration avec la profondeur. Un site à Windsor, Virginie, est utilisé pour démontrer les problématiques associées à la collecte de données, au calibrage et traitement des données, lorsqu'un grand nombre d'ondelette nécessitent du filtrage, du fenêtrage, et la sélection dans les domaines d'analyses de temps et de fréquence. La géologie du site d'essai consiste en des dépôts peu profonds d'argiles et de sables de l'Holocène jusqu'à 8 m, déposés sur des sols d'argile marine de calcaire beaucoup plus rigides datant du Miocène qui s'étendent au-delà des profondeurs terminales des environs à 30 m. [Traduit par la Rédaction] Mots-clés : pénétration du cône, essai dans les trous de forage, géophysique, essais in-situ, ondes sismiques, vitesse des ondes de cisaillement.

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“…Campanella and Stewart (Campanella, R. G. & Stewart, W. P., 1992), determined various soil parameters by digital signal processing, while Butcher and Powell (Butcher, A. P. and Powell, J. J., 1995), supplied practical geophysical techniques to assess various soil parameters related to ground stiffness. An empirical expression is also proposed by Abd El-Rahman et al (Abd El-Rahman, M. M, Setto, I., & El-Werr, A., 1992), for the ultimate bearing capacity of soils, using the logarithm of shear wave velocity.…”

Section: Introductionmentioning

confidence: 99%

Allowable Bearing Pressure in Soils and Rocks through Seismic Wave Velocities

Tezcan¹,

Özdemir²

2012

ESR

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Based on a variety of case histories of site investigations, including extensive bore hole data, laboratory testing and geophysical prospecting at more than 550 construction sites, an empirical formulation is proposed for the rapid determination of allowable bearing pressure of shallow foundations in soils and rocks. The proposed expression corroborates consistently with the results of the classical theory and is proven to be rapid, and reliable. Plate load tests have been also carried out at three different sites, in order to further confirm the validity of the proposed method. It consists of only two soil parameters, namely, the in situ measured shear wave velocity and the unit weight. The unit weight may be also determined with sufficient accuracy, by means of other empirical expressions proposed, using P or S -wave velocities. It is indicated that once the shear and P-wave velocities are measured in situ by an appropriate geophysical survey, the allowable bearing pressure as well as the coefficient of subgrade reaction and many other elasticity parameters may be determined rapidly and reliably.

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Seismic cone analysis using digital signal processing for dynamic site characterization

Cited by 61 publications

References 6 publications

Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

Dynamic Characterization of Cohesive Material Based on Wave Velocity Measurements

Continuous-interval shear wave velocity profiling by auto-source and seismic piezocone tests

Allowable Bearing Pressure in Soils and Rocks through Seismic Wave Velocities

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