ANALYSIS OF COMBINED FOOTINGS ON EXTENSIBLE GEOSYNTHETIC-STONE COLUMN IMPROVED GROUND

Authors

  • Priti Maheshwari

DOI:

https://doi.org/10.33736/jcest.439.2017

Abstract

Analysis of combined footings resting on an extensible geosynthetic reinforced granular bed on stone column improved ground has been carried out in the present work. Various components of soil-foundation system have been idealized using lumped parameter modeling approach as: combined footing as finite length beam, granular layer as nonlinear Pasternak shear layer, geosynthetic reinforcement as elastic extensible membrane, stone columns as nonlinear Winkler springs and foundation soil as nonlinear Kelvin body. Hyperbolic constitutive relationships have been adopted to represent the nonlinear behavior of various elements of a soil-foundation system. Finite difference method has been employed to solve developed governing differential equations with the help of appropriate boundary and continuity conditions. A detailed parametric study has been conducted to study the effect of model parameters like applied load, flexural rigidity of footing, configuration of stone columns, ultimate bearing resistance of foundation soil and stone columns, tensile stiffness of geosynthetics and degree of consolidation on response of soil-foundation system by means of deflection and bending moment in the footing and mobilized tension in geosynthetic layer. These parameters have been found to have significant influence on the response of footing and the geosynthetic reinforcement layer. To quantify this, results have been nondimensionalized to produce design charts for ready use for the analysis of combined footings resting on such a soilfoundation system.

References

Balaam, N.P. & Booker, J.R. (1981). Analysis of Rigid Rafts Supported by Granular Piles. International Journal for Numerical and Analytical Methods in Geomechanics. 5: 379-403.

https://doi.org/10.1002/nag.1610050405

Alamgir, M., Miura, N., Poorooshasb, H. B. & Madhav,M. R. (1996). Deformation Analysis of Soft Ground Reinforced by Columnar Inclusions. Computers and Geotechnics. 18 (4): 267-290.

https://doi.org/10.1016/0266-352X(95)00034-8

Shahu, J. T., Madhav, M. R. & Hayashi, S. (2000). Analysis of Soft Ground-Granular Pile-Granular Mat System. Computers and Geotechnics. 27 (1): 45-62.

https://doi.org/10.1016/S0266-352X(00)00004-5

Madhav, M. R. & Poorooshasb, H. B. (1988). A New Model for Geosynthetic Reinforced Soil. Computers and Geotechnics. 6 (4): 277-290.

https://doi.org/10.1016/0266-352X(88)90070-5

Ghosh, C. & Madhav, M. R. (1994). Settlement Response of a Reinforced Shallow Earth Bed. Geotextiles and Geomembranes, 13: 643-656.

https://doi.org/10.1016/0266-1144(94)90065-5

Shukla, S. K. & Chandra,S. (1994). A Generalized Mechanical Model for Geosynthetic-Reinforced Foundation Soil. Geotextiles and Geomembranes. 13: 813-825.

https://doi.org/10.1016/0266-1144(94)00018-9

Yin, J. H. (1997). A Nonlinear Model of Geosynthetic-Reinforced Granular Fill over Soft Soil. Geosynthetics International. 4 (5): 523-537.

https://doi.org/10.1680/gein.4.0105

Maheshwari, P., Basudhar, P. K. & Chandra, S. (2004). Analysis of Beams on Reinforced Granular Beds. Geosynthetics International. 11 (6): 470-480.

https://doi.org/10.1680/gein.11.6.470.54387

Deb, K., Sivakugan, N., Chandra, S. & Basudhar, P. K. (2007). Generalized Model for Geosynthetic-Reinforced Granular Fill-Soft Soil with Stone Columns. International Journal of Geomechanics, ASCE. 7 (4): 266-276.

https://doi.org/10.1061/(ASCE)1532-3641(2007)7:4(266)

Deb, K., Chandra, S. & Basudhar, P. K. (2010). Analysis of Extensible Geosynthetics and Stone Column-Reinforced Soil. Ground Improvement. 163 (4): 231 - 236.

https://doi.org/10.1680/grim.2010.163.4.231

Maheshwari, P. & Khatri, S. (2012). Generalized Model for Footings on Geosynthetic - Reinforced Granular Fill -Stone Column Improved Soft Soil System. International Journal of Geotechnical Engineering. 6 (4): 403-414.

https://doi.org/10.3328/IJGE.2012.06.04.403-414

Zhou, W.-H., Zhao, L.-S. & Li, X.-B. (2014). Analytical Study for Geosynthetic Reinforced Embankment on Elastic Foundation. Geotechnical Special Publication 238, Ground Improvement and Geosynthetics, ASCE, 444-451.

https://doi.org/10.1061/9780784413401.044

Rajesh, S., Choudhary, K. & Chandra, S. (2015). A Generalized Model for Geosynthetic Reinforced Railway Tracks Resting on soft Clays. International Journal of Numerical and Analytical Methods in Geomechanics. 39: 310-326.

https://doi.org/10.1002/nag.2318

Zhao, L.-S., Zhou, W.-H., Fatahi, B., Li,X.-B. & Yuen, K.-V. (2016) A Dual Beam Model for Geosynthetic-Reinforced Granular Fill on an Elastic Foundation. Applied Mathematical Modelling. 40: 9254-9268.

https://doi.org/10.1016/j.apm.2016.06.003

Som, N. N. & Das, S. C. (2003). Theory and Practice of Foundation Design, Prentice - Hall of India Private Limited, New Delhi.

Bowles, J. E. (1996). Foundation Analysis and Design. 5th Edition, McGraw-Hill Book Co., Singapore.

Das, B. M. (1999), Principles of Foundation Engineering. 4th Edition, PWS Publishing, USA.

Desai, C. S. & Abel, J. F. (1987). Introduction to the Finite Element Method: A Numerical Method for Engineering Analysis, CBS Publishers and Distributors, India.

Downloads

Published

2017-10-05

How to Cite

Maheshwari, P. (2017). ANALYSIS OF COMBINED FOOTINGS ON EXTENSIBLE GEOSYNTHETIC-STONE COLUMN IMPROVED GROUND. Journal of Civil Engineering, Science and Technology, 8(2), 57–71. https://doi.org/10.33736/jcest.439.2017