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Geomechanics and Engineering
  Volume 4, Number 4, December 2012, pages 263-279
DOI: http://dx.doi.org/10.12989/gae.2012.4.4.263
 


Influence of inclusion of geosynthetic layer on response of combined footings on stone column reinforced earth beds
Priti Maheshwari and Shubha Khatri

 
Abstract
    The present paper deals with the analysis of combined footings resting on geosynthetic reinforced granular fill overlying stone column improved poor soil. An attempt has been made to study the influence of inclusion of geosynthetic layer on the deflection of the footing. The footing has been idealized as a beam having finite flexural rigidity. Granular fill layer has been represented by Pasternak shear layer and stone columns and poor soil have been represented by nonlinear Winkler springs. Nonlinear behavior of granular fill layer, stone columns and the poor soil has been considered by means of hyperbolic stress strain relationships. Governing differential equations for the soil-foundation system have been derived and solution has been obtained employing finite difference scheme by means of iterative Gauss Elimination method. Results of a detailed parametric study have been presented, for a footing supporting typically five columns, in non-dimensional form in respect of deflection with and without geosynthetic inclusion. Geosynthetic layer has been found to significantly reduce the deflection of the footing which has been quantified by means of parametric study.
 
Key Words
    Stone columns, combined footing, geosynthetic layer, nonlinear behavior.
 
Address
Priti Maheshwari : Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee-247667, India
Shubha Khatri : Formerly Research Scholar, Department of Civil Engineering, Indian Institute of Technology Roorkee,
Roorkee-247667, India
 

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