Development of a New Asymmetric Anchor Plate for Prefabricated Vertical Drain Installation via Centrifuge Model Tests
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 6
Abstract
This study investigates the kinematic behavior of a clay-mandrel-anchor system during the driving-retrieval process and its influence on the installation of prefabricated vertical drains and clay disturbance. In addition, a new anchor plate with an asymmetric shape is proposed as an alternative for improved anchoring performance and clay disturbance mitigation. To investigate the behavior of the clay-mandrel-anchor system, two-dimensional centrifuge model tests were developed and successfully performed to visualize anchoring kinematics and deformation of the clay layer. The tests demonstrated that the asymmetric anchor plate effectively provides an anchoring mechanism and reduces the degree of disturbance. The conventional anchor has potential risk of delayed anchoring and thus unsuccessful installation. While the amount and extent of clay deformation are obviously affected by the protruding length of the anchor plates into the clay, the protrusion length has less influence on the range of the smear zone than the degree of disturbance in the smear zone. The asymmetric anchor considerably reduces the smear effect, as three sides of the mandrel have minimal protrusion length from the center unlike in the conventional anchors.
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Acknowledgments
This research was funded by Samsung C&T Corporation and partially supported by the National Research Foundation of Korea (NRF) grant of the Korean government (MEST) (No. 2011-0000314). The authors acknowledge Dr. M. Shazzad Hossain and Professor D. White at University of Western Australia for providing inspiration in developing centrifuge models and analyzing digital image data. The authors also appreciate the laboratory support personnel at the KAIST Geotechnical Centrifuge Center.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 6 • June 2013
Pages: 987 - 992
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 26, 2011
Accepted: Jun 20, 2012
Published online: Aug 1, 2012
Published in print: Jun 1, 2013
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