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Article: Measurement biases in the bender element test

TitleMeasurement biases in the bender element test
Authors
KeywordsMeasurement
Velocity
Issue Date2007
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/gt.html
Citation
Journal Of Geotechnical And Geoenvironmental Engineering, 2007, v. 133 n. 5, p. 564-574 How to Cite?
AbstractThis paper reconsiders the signals that are transmitted in bender element tests and the associated transfer functions to identify the problems that bias the velocity (travel time) determination. The findings of the numerical and physical experiments show that errors appearing in the velocity estimation can be traced to (1) the near-field effect and (2) the influence caused by the transfer function of the receiver system, HR. The second factor also creates distinguishing changes between the source and receiver signals. In a two-receiver measurement system, the accurate travel time (velocity) can be identified by the cross correlation of the two receiver signals only if the near field is not pronounced and the two receivers possess very similar transfer functions. The near-field effect can be effectively avoided by placing the sensors at r1/λ≥2 and r1/r2≥2, where r1 and r2=distances between the source and the first and second receivers, respectively, and λ=wavelength. In a one-receiver measurement system, the inherent time delay caused by the transfer function of the receiver system, HR, has to be quantified and corrected. The near-field effect also can be avoided by placing the receiver at least 2λ away from the source. © 2007 ASCE.
Persistent Identifierhttp://hdl.handle.net/10722/150404
ISSN
2015 Impact Factor: 1.696
2015 SCImago Journal Rankings: 2.344
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, YHen_US
dc.contributor.authorLo, KFen_US
dc.contributor.authorYan, WMen_US
dc.contributor.authorDong, XBen_US
dc.date.accessioned2012-06-26T06:04:21Z-
dc.date.available2012-06-26T06:04:21Z-
dc.date.issued2007en_US
dc.identifier.citationJournal Of Geotechnical And Geoenvironmental Engineering, 2007, v. 133 n. 5, p. 564-574en_US
dc.identifier.issn1090-0241en_US
dc.identifier.urihttp://hdl.handle.net/10722/150404-
dc.description.abstractThis paper reconsiders the signals that are transmitted in bender element tests and the associated transfer functions to identify the problems that bias the velocity (travel time) determination. The findings of the numerical and physical experiments show that errors appearing in the velocity estimation can be traced to (1) the near-field effect and (2) the influence caused by the transfer function of the receiver system, HR. The second factor also creates distinguishing changes between the source and receiver signals. In a two-receiver measurement system, the accurate travel time (velocity) can be identified by the cross correlation of the two receiver signals only if the near field is not pronounced and the two receivers possess very similar transfer functions. The near-field effect can be effectively avoided by placing the sensors at r1/λ≥2 and r1/r2≥2, where r1 and r2=distances between the source and the first and second receivers, respectively, and λ=wavelength. In a one-receiver measurement system, the inherent time delay caused by the transfer function of the receiver system, HR, has to be quantified and corrected. The near-field effect also can be avoided by placing the receiver at least 2λ away from the source. © 2007 ASCE.en_US
dc.languageengen_US
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/gt.htmlen_US
dc.relation.ispartofJournal of Geotechnical and Geoenvironmental Engineeringen_US
dc.subjectMeasurementen_US
dc.subjectVelocityen_US
dc.titleMeasurement biases in the bender element testen_US
dc.typeArticleen_US
dc.identifier.emailYan, WM:ryanyan@hku.hken_US
dc.identifier.authorityYan, WM=rp01400en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1061/(ASCE)1090-0241(2007)133:5(564)en_US
dc.identifier.scopuseid_2-s2.0-34247250258en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34247250258&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume133en_US
dc.identifier.issue5en_US
dc.identifier.spage564en_US
dc.identifier.epage574en_US
dc.identifier.isiWOS:000247984100008-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridWang, YH=7601486517en_US
dc.identifier.scopusauthoridLo, KF=15846311100en_US
dc.identifier.scopusauthoridYan, WM=35369531200en_US
dc.identifier.scopusauthoridDong, XB=23994940500en_US

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