%0 Journal Article
%T 3D FE Analysis of an Embankment Construction on GRSC and Proposal of a Design Method
%A Yogendra K. Tandel
%A Chandresh H. Solanki
%A Atul K. Desai
%J ISRN Civil Engineering
%D 2013
%R 10.1155/2013/348973
%X Stone column is often employed for strengthening of an embankment seated on deep soft clay. But in very soft clay having undrained shear strength less than or equal to 15£¿kPa, stone column may not derive adequate load carrying capacity and undergo large lateral deformation due to inadequate lateral confinement. In such circumstances, reinforcement to individual stone column by geosynthetics enhances load carrying capacity and reduces lateral deformation. This paper addresses parametric study on behaviour of embankment resting on Geosynthetic Reinforced Stone Column (GRSC) considering parameters such as stone column spacing to diameter ratio, deformation modulus of stone column material, geosynthetic stiffness, thickness of soft clay, and height of embankment by 3D numerical analysis. Finally, equation for Settlement Improvement Factor (SIF), defined as ratio between settlement of embankment without treatment and with geosynthetic reinforced stone column, is proposed that correlates with the major influence parameters such as stone column spacing to diameter ratio, deformation modulus of soft clay, and geosynthetic stiffness. 1. Introduction Embankment seated on deep soft clay may undergo large settlement both vertically and horizontally. Various ground improvement techniques adopted to mitigate the settlements are stone column [1, 2], preconsolidation using prefabricated vertical drains [3, 4], vacuum preconsolidation [5, 6], deep mixed column [7, 8], and so forth. Provision of stone column in the embankment foundation has advantage of reinforcing effect, reduction in settlement, and acceleration of consolidation settlement. However, in soft clay having undrained cohesion less than or equal to 15£¿kPa, there will be excessive lateral deformation of stone column. Also, soft clay may penetrate into the stone column [9]. To overcome these problems, individual stone column may be reinforced peripherally by using a suitable geosynthetic. Numerous researchers have acknowledged this concept [10¨C18]. Most of the previous studies have focused on the effect of geosynthetic reinforcement on load carrying capacity of isolated stone column only. Very few authors have studied behaviour of GRSC under long-term loading condition, that is, embankment loading [19¨C21]. Current study examines the performance of embankment supported on GRSC. Effect of GRSC spacing to diameter ratio, deformation of stone column material, geosynthetic stiffness, thickness of soft clay, and height of embankment on embankment settlement is studied. Based on the present study, equation for SIF is
%U http://www.hindawi.com/journals/isrn.civil.engineering/2013/348973/