Chapter
Apr 26, 2012
Evaluation of the PVD Smear Zone Using Micro Penetrometer
Authors: Raehyun Kim, Ph.D. [email protected], Young-Min Choi junwi99@ hotmail.com, Jong-Sub Lee [email protected], and Woojin Lee [email protected]Author Affiliations
Publication: GeoFlorida 2010: Advances in Analysis, Modeling & Design
Abstract
In this study, small sized micro cone penetrometers with 3mm, 5mm and 7mm outer diameters are designed and manufactured in order to evaluate the dimension and shape of the smear zone of prefabricated vertical drain (PVD). The tip resistance is measured by using strain gauges and fiber optic sensors attached near the micro cone tip. The PVD smear zone is investigated by a series of radial penetration tests in the clay specimen prepared in a large-scale consolidometer. Almost constant value of the cone tip resistance is measured within the undisturbed zone. The outer boundary of the smear zone is identified as the location where the deviation of the measured cone tip resistance from the constant value is observed. In addition, the significant change in cone tip resistance is observed in the smear zone with remarkably consistent patterns. This study shows that the PVD smear zone has the asymmetric shape and is effectively detected by using micro penetrometer.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Student, School of Civil, Environmental and Architectural Engineering, Korea University, 136-713, Seoul, Korea. E-mail: [email protected]
Graduate student, School of Civil, Environmental and Architectural Engineering, Korea University, 136-713, Seoul, Korea. E-mail: junwi99@ hotmail.com
Associate Professor, School of Civil, Environmental and Architectural Engineering, Korea University, 136-713, Seoul, Korea. E-mail: [email protected]
Associate Professor, School of Civil, Environmental and Architectural Engineering, Korea University, 136-713, Seoul, Korea. E-mail: [email protected]
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