Shaking Table Investigation of Effects of Inclination Angle on Seismic Performance of Micropiles
Publication: International Journal of Geomechanics
Volume 18, Issue 11
Abstract
This paper aims to experimentally study the performance of inclined micropiles under dynamic loading conditions. Analysis is performed using data obtained from shaking table tests on a small-scale physical model of micropiles with different inclination angles. The physical model includes a 4 × 4 micropile system inserted in sandy soil with low relative density. Inclination angle of micropiles in the direction of shaking is varied in the range of field applications. A sine wave is applied to the physical model as the input excitation and acceleration response at different points of the physical model are recorded and analyzed to investigate the effects of inclination angle of micropiles on their seismic performance. After describing the small-scale physical model used in this study, results of shaking table tests are presented, and effects of inclination angle on the dynamic response of the soil–micropile system are examined. Results of this study indicate that inclined micropiles exhibit a better seismic performance than vertical micropiles. Dynamic amplifications of acceleration on micropiles and soil surface can be reduced by inclining the micropiles.
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Acknowledgments
This research project is financially supported by a research grant from Collaborative Research Fund (CRF) Project PolyU12/CRF/13E from the Research Grants Council (RGC) of the Government of Hong Kong Special Administrative Region of China, and a research grant (Project 2014CB047001) from the Ministry of Science and Technology of the People’s Republic of China. The authors wish to express their gratitude to the technical staff at Laboratories of Structural Dynamics, Concrete Technology, Soil Mechanics and Rock Mechanics of Hong Kong Polytechnic University for their kind support in preparation and conduction of experiments of this project. The authors also acknowledge the financial supports from Research Institute for Sustainable Urban Development of Hong Kong Polytechnic University. Finally, the authors wish to thank Dr. M. Alitalesh for her constructive suggestions throughout this study.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 11 • November 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jun 1, 2017
Accepted: Mar 14, 2018
Published online: Aug 23, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 23, 2019
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