Behaviour of Columns and Fibre Reinforced Load Transfer Platform Supported Embankments Built on Soft Soil

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This paper presents the findings of a numerical study on the behaviour of fibre reinforced load transfer platform (FRLTP) and cement-soil columns supported (CS) embankment constructed on soft soil. An array of numerical analyses based on finite element method incorporated in PLAXIS was conducted on the full geometry of an embankment reinforced without or with an FRLTP over cement-soil columns for different improvement depth in a two-dimensional plane strain condition to examine the effectiveness of the FRLTP inclusion into the CS embankment system. The beneficial effects of lime-fibre-soil inclusion as a load transfer platform (LTP) and cement-soil columns supported embankment on the total and differential settlements, stress transfer mechanism, and lateral displacement have been analyzed and discussed in detail. Subsequently, a detailed parametric study on the influence of the shear strength parameters of the FRLTP has also been performed and discussed to provide a better understanding of the interaction between FRLTP, cement-soil columns and embankment over soft soil. The findings reveal that the CS embankment with FRLTP inclusion can provide the effective improvement in minimising the total and differential settlements, and the lateral displacement, meanwhile enhance the embankment stability and the stress concentration ratio to a great extent. Moreover, the numerical simulation results display that the increase in the improvement depth of the embankment reinforced with an FRLTP over cement-soil columns accelerate the consolidation progress of soft soils subjected to embankment loads. The numerically predicted results from the parametric study indicate that the cohesion and friction angle of the FRLTP have notable influence on the investigated embankment behaviour in terms of improving stress concentration ratio and differential settlement. However, the cohesion of FRLTP appears to be the most influential factor to be considered in the design procedures of the target embankment system.
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