Modelling of columns and fibre-reinforced load-transfer platform-supported embankments

Abstract

A novel ground modification technique is proposed utilising a fibre-reinforced load-transfer platform (FRLTP) and deep cement mixing column-supported (CS) embankment constructed over soft soils. An equivalent two-dimensional finite-element model was developed to simulate the full geometry of a CS embankment reinforced without or with an FRLTP. A series of numerical analyses was first conducted on the proposed model for different improvement depths to assess the effectiveness of the introduction of FRLTP into the CS embankment system in terms of total and differential settlements, the stress-transfer mechanism and lateral displacement with depth. Subsequently, another extensive parametric study was conducted to further investigate the influence of the FRLTP key parameters, including elastic deformation modulus, shear strength properties and tensile strength, on the embankment performance during construction and consolidation time. The numerical results showed that the FRLTP effectively diminished the total settlement and the lateral deformation of the embankment, while improving the stress concentration ratio and the embankment stability to a great extent. The findings of the extensive parametric study indicate that the FRLTP's shear strength properties appear to be the most influential factors to be considered in the design procedure of a target CS–FRLTP–embankment system.