Numerical modelling of Geosynthetic-Reinforced and Pile-Supported Embankments construction during consolidation

Abstract

Geosynthetic-Reinforced and Pile-Supported Embankments (GRPSE) are geotechnical structures designed to reduce settlements when constructing embankments on soft soils. These systems combine the load-bearing capacity of piles with the reinforcing effects of geosynthetics, creating a composite structure that effectively transfers embankment loads to deep competent soil layers. Accurate estimation of both (i) settlements at the top of GRPSEs, which are critical for ensuring the long-term performance and serviceability of overlying infrastructure (e.g., roads, railways, and industrial facilities), and (ii) settlements at the base of the embankment, which govern the design of geosynthetic reinforcement, is essential. Numerical modelling of GRPSE construction during consolidation offers valuable insights into their long- term performance as a function of the construction process. This is due to the incorporation of key elements such as soil arching, load transfer to piles, and the tension-membrane effect of geosynthetic reinforcement. Three embankment construction rates are investigated in this study to evaluate their influence on the long- term performance of GRPSEs. The results provide insight into how construction rate affects the behavior of these complex geotechnical systems, contributing to the development of more efficient and cost-effective design solutions.