Numerical Analysis of Multi Layer Geosynthetic-Reinforced Granular Bed over Soft Fill |
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| Authors: | Kousik Deb N Sivakugan Sarvesh Chandra P K Basudhar |
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| Institution: | (1) Present address: Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India;(2) Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India;(3) Civil & Environmental Engineering Department, James Cook University, Townsville, QLD, 4811, Australia |
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| Abstract: | In this paper, considering the plain strain conditions, a numerical study has been conducted to investigate the behavior of
multi layer geosynthetic-reinforced granular bed overlying a soft soil using the Fast Lagrangian Analysis of Continua (FLAC)
program. The granular fill, soft soil, and geosynthetic reinforcements are considered as linear elastic materials. The geosynthetic
reinforcements are modeled as cable elements fully bonded with the surrounding soil, thus neglecting any slip. The results
obtained from the present investigation showed very close agreement when compared with the results of finite element analysis
and lumped parameter modeling. The distribution of vertical, lateral and shear stresses in the soil are greatly affected as
the number of reinforcement layers is increased. If the tensile stiffness of geosynthetic layers increases and its value is
no more than 4,000–5,000 kN/m, the settlement of the reinforced foundation decreases significantly. The reduction in settlement
is insignificant when the tensile strength of the geosynthetics exceed the above value. |
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| Keywords: | Geosynthetic reinforcements Granular bed FLAC Multi layer Soft soil |
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