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• W2967331353 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2019Evaluation of near-surface anomalous conditions beneath drilled shaft excavations using full waveform inversionAuthors: Alireza KordjaziJoseph Thomas CoeSiavash MahvelatiAlireza KordjaziTemple UniversitySearch for more papers by this author, Joseph Thomas CoeTemple UniversitySearch for more papers by this author, and Siavash MahvelatiTemple UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segam2019-3216900.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractDrilled shaft foundation elements are routinely used in engineering applications to support large infrastructure. Their performance is inherently related to the stiffness of the near-surface geologic material underlying the site of interest. In many cases, drilled shaft elements derive the bulk of their capacity from sockets constructed in bedrock. In some geologic environments, rock-socketed drilled shafts may suffer from poor performance if the conditions underlying their excavations are not adequately evaluated prior to construction. For example, their capacity can be compromised by soft zones indicative of anomalous soil-filled seams or voids in karst. Typical quality control measures during construction rely on rock coring and probes that fail to adequately evaluate the spatial extent of such anomalous conditions. Current non-destructive testing (NDT) methods based on geophysical measurements are not commonly employed and suffer from resolution limitations. This paper numerically explores the use of high-frequency full waveform inversion (FWI) tomography to generate a high resolution near-surface image of the conditions underlying a drilled shaft excavation. The purpose of this image is to determine the extent of a soft, soil-filled karst seam underlying the drilled shaft prior to construction. The results highlighted that an FWI approach can provide sufficient resolution to effectively locate the soft soil-filled zone. However, the spatial extent of the soft zone is harder to evaluate accurately as is its true stiffness. Additionally, efforts must be made to mitigate the effects of cycle-skipping. In this particular study, multiple misfit functions were utilized to ensure that FWI converged to a reasonable solution.Presentation Date: Tuesday, September 17, 2019Session Start Time: 8:30 AMPresentation Time: 9:20 AMLocation: 217CPresentation Type: OralKeywords: full-waveform inversion, engineering, near surfacePermalink: https://doi.org/10.1190/segam2019-3216900.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2019ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2019 Pages: 5407 publication data© 2019 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 10 Aug 2019 CITATION INFORMATION Alireza Kordjazi, Joseph Thomas Coe, and Siavash Mahvelati, (2019), Evaluation of near-surface anomalous conditions beneath drilled shaft excavations using full waveform inversion, SEG Technical Program Expanded Abstracts : 2823-2827. https://doi.org/10.1190/segam2019-3216900.1 Plain-Language Summary Keywordsfull-waveform inversionengineeringnear surfacePDF DownloadLoading ..." @default.
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• W2967331353 title "Evaluation of near-surface anomalous conditions beneath drilled shaft excavations using full waveform inversion" @default.
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