Calculation Method for Settlement of CFG Pile-Net Composite Foundation in High-Speed Railway

Combined with the field tests of CFG (cement fly-ash gravel) pile-net (geogrid) composite foundation in the Danyang Test Section of the Beijing-Shanghai High-speed Railway, the pile-soil stress, additional stress, and settlement of composite foundation are analyzed by theoretical analysis. It shows that the distribution of additional stress solved by Mindlin-Boussinesq solution agrees reasonably well with the actual conditions, and the settlement of composite foundation calculated by the layer-wise summation method based on the Mindlin-Boussinesq solution is consistent with field measurements. The research results can provide references to railway engineering, which is strictly limited in the settlement of composite foundation.