New Analytic Method for Subgrade Settlement Calculation of the New CFG Pileslab Structure

At present, reducing subgrade settlement of soft soil foundation is a key problem in high-speed railwayconstruction. Pile-slab structure is a widely-utilized form of foundation structure to reduce thesubgrade settlement in China. In order to save the engineering cost for high-speed railway constructionin developing countries, the author developed a pile-slab structure and named it as the new CFG pileslabstructure. This work analyzed the settlement controlling effect of new CFG pile-slab structure andsummarized two calculation methods on its subgrade settlement which are further formulated into ananalytic method. Three methods were used to calculate the subgrade settlement of CFG pile-slabstructure for a soft soil foundation in Chinese Shanghai-chengdu high-speed railway. The researchshowed that: (1)The settlement controlling effect of CFG pile-slab structure can satisfy the requirementof high-speed railway construction. (2) The new analytic method is proved to be more accurate and canreflect the mechanism of load transferring．Furthermore，the new analytic method can providetheoretical guidances for engineering designs and constructions of the CFG pile-slab structure．