Parameters Analysis Based on Simplified Method to Solve Piled Embankment with Geogrid-Reinforcement

In order to analyze the influence of parameters on load transfer and deformation mechanisms of piled embankment with geogrid-reinforcement, a simplified method was proposed and employed for parameters analysis. A method including soil arching effect in granular material, subsoil resistance and membrane effect, is deduced and the deformation of the geogrid is expressed by Quadratic parabolic equation. Through comparative analysis with test data and other current design methods, it is found that the proposed method is conceptually and mathematically simple, and the results are reliable. The influence of embankment height, tensile stiffness of the geogrid, soft soil depth and compression modulus of soft soil on the tension of the geogrid, the settlement of soft ground and stress concentration ratio are studied using this method. The influence significance of these factors has been investigated by the evaluation theory of binary variance analysis of non-repeatability tests. The results show that the tension of geogrid is in proportion to embankment height, tensile stiffness of geogrid, soft soil depth, but in inversely proportion to compression modulus of soft soil. The settlement of soft ground is in proportion to embankment height, soft soil depth, but in inversely proportion to tensile stiffness, compression modulus of soft soil. Rsc is in proportion to embankment height, tensile stiffness, soft soil depth, but in inversely proportion to compression modulus of soft soil. Decreasing soft soil depth and improving compression modulus of soft soil are both the effective methods to transfer more load to piles. Larger pile caps and small pile spacing should be prior to adopting the geogrid with high tensile stiffness in promoting transferring more load to piles.