Axi-symmetric Analysis of Geosynthetic-reinforced Granular Fill-soft Soil System with Group of Stone Columns |
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| Authors: | Kousik Deb P K Basudhar and S Chandra |
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| Institution: | (1) Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India;(2) Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India;(3) School of Civil Engineering, Surveying and Construction, University of Kwazulu-Natal, Howard College Campus, Durban, South Africa |
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| Abstract: | The paper presents a mechanical model to predict the behavior of geosynthetic-reinforced granular fill resting over soft soil
improved with group of stone columns subjected to circular or axi-symmetric loading. The saturated soft soil has been idealized
by spring-dashpot system. Pasternak shear layer and rough elastic membrane represent the granular fill and geosynthetic reinforcement
layer, respectively. The stone columns are idealized by stiffer springs. The nonlinear behavior of granular fill and soft
soil is considered. Consolidation of the soft soil due to inclusion of stone columns has also been included in the model.
The results obtained by using the present model when compared with the reported results obtained from laboratory model tests
shows very good agreement. The effectiveness of geosynthetic reinforcement to reduce the maximum and differential settlement
and transfer the stress from soft soil to stone columns is highlighted. It is observed that the reduction of settlement and
stress transfer process are greatly influenced by stiffness and spacing of the stone columns. It has been further observed
that for both geosynthetic-reinforced and unreinforced cases, the maximum settlement does not change if the ratio between
spacing and diameter of stone columns is greater than 4. |
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