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DTSTART;TZID=America/Los_Angeles:20220729T130000
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DTSTAMP:20260405T234246
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UID:3145-1659099600-1659103200@tridurle.wsu.edu
SUMMARY:Recent Advances in Measuring Volume of Soil Specimen in Triaxial Testing
DESCRIPTION:Presentation\nRecent Advances in Measuring Volume of Soil Specimen in Triaxial Testing \nTriaxial tests have been widely used for measuring the stress-strain behavior of both saturated and unsaturated soils. Volume/displacement measurement is an indispensable component of the triaxial testing. This paper provides a state-of-the-art review on the existing methods to measure volume change and/or displacement measurements for soil specimen during triaxial testing. Through a comprehensive literature study\, it was concluded that it is still challenging to measure volume change for soil specimen during triaxial testing for both saturated and unsaturated soils. A photogrammetry-based method\, which was proposed by Zhang et al. (2015) to measure the full-field displacement of a soil specimen during triaxial testing\, was then discussed. The principle of the method is discussed\, testing procedures are introduced\, and implementation of the proposed method is elaborated. After that\, some recent advances made in implementing the method are introduced\, such as automation of the computation process through use of coded targets for high accuracy 3D reconstruction\, automatic correction of the incorrect ID and high efficiency ID identification through a newly proposed table method\, and a mathematically rigorous method to determine the locations of the top and bottom pedestals. These new technologies are used to validate the accuracy of the proposed method. The absolute volume\, tilting\, eccentricity\, localized volume and strain calculations can be made which open a new door to more comprehensive evaluation of soil behavior with much higher accuracy and low cost. Discussions are also made regarding how to extend the proposed method for dynamic soil testing using a multi-camera system. \nSpeaker\n\nXiong Zhang\, PhD\, PE Professor\nMissouri University of Science and Technology \nDr. Xiong Zhang is a professor in the Department of Civil\, Architectural\, and Environmental Engineering at the Missouri University of Science and Technology (Missouri S&T). He received his Ph.D. degree in Civil Engineering from Texas A&M University\, M.S. and B.S. degrees in Geotechnical Engineering from China Institute of Water Resources and Hydropower Research (IWHR)\, Beijing\, China\, and Tongji University\, Shanghai\, China\, respectively. Before he joined in the Missouri S&T\, he worked at the University of Alaska Fairbanks and University of Cincinnati for 10 years. Dr. Zhang is currently serving as editorial board member of Canadian Geotechnical Journal\, Associate Editor for ASCE Journal of Cold Region Engineering. His research focuses on development of advanced laboratory techniques to rapidly characterize geomaterials\, constitutive modeling coupled hydro-mechanical behavior of unsaturated soils\, numerical modeling of climate-soil-structure interaction\, slope stability analysis\, soil stabilization and ground improvement\, and frozen ground engineering.
URL:https://tridurle.wsu.edu/event/recent-advances-in-measuring-volume-of-soil-specimen-in-triaxial-testing/
ORGANIZER;CN="TriDurLE":MAILTO:jialuo.he@wsu.edu
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