Modified load sharing calculation model of geosynthetic-reinforced and pile-supported embankments

Based on the combined analysis of soil arching effect and reinforcement effect between piles, an improved Hewlett model for load sharing calculation of geosynthetic-reinforced and pile-supported embankments (GRPSE) is established. Firstly, the governing equations of spherical arch and plane arch are solved respectively, according to whether the soil arch is in a plastic state and combined with the vertical force balance condition of pile-soil, then the load sharing of embankment filling is initially determined. Secondly, the differential equation for controlling the stress balance of the geosynthetic reinforcement can be built and solved without presetting the deflection form, the overlying load of the reinforcement belt is assumed to be an inverted triangle distribution in line with the actual working conditions, and the Winkler foundation model is applied to consider the soil reaction between piles within the influence range of one reinforcement belt. Thereafter, the embankment loading can be redistributed according to the calculated reinforcement effect. It proves that the improved model can reasonably predict the load sharing and the stress results of reinforcement according to the verification and discussion of case studies and the comparative analysis of several models. Parameter analysis shows that the improved model can reasonably predict the influence of geometric and material parameters on load sharing of GRPSE.