Response of Cylindrical Storage Tank Foundation Resting on Tensionless Stone Column-Improved Soil
Publication: International Journal of Geomechanics
Volume 17, Issue 1
Abstract
In the present paper, the response of cylindrical storage tank foundation resting on stone column-reinforced ground has been studied considering the separation between the bottom raft and ground under liftoff condition. The bottom raft of the tank is idealized by a circular plate. The stone column-reinforced ground is modeled as a tensionless foundation. Soft foundation soil and granular fill are idealized as a spring-dashpot element and Pasternak shear layer, respectively. Stone columns are modeled as stiff nonlinear springs. The stone columns are converted into equivalent concentric rings with one stone column at the center to simulate the axisymmetric condition for the analysis. The governing differential equations are derived from the classical theory of thin plate and solved using the finite-difference technique. A parametric study is performed to investigate the differences between the response of tensionless and conventional elastic foundation systems. It is observed that tensionless foundation idealization is essential to analyze the liftoff and avoid erroneous design of the raft for the cylindrical storage tank. Recommendations are also suggested to avoid possible liftoff.
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Acknowledgments
The authors sincerely acknowledge the financial support provided by SERB, Department of Science and Technology, India, for this research work.
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Published In
International Journal of Geomechanics
Volume 17 • Issue 1 • January 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 24, 2015
Accepted: Mar 18, 2016
Published online: Apr 14, 2016
Discussion open until: Sep 14, 2016
Published in print: Jan 1, 2017
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