Abstract：Jet grouting(JG) soil-cement-pile strengthened pile(JPP) is a new kind of composite pile composed of high pressure jet grouting pile and prestressed core pile. JPP has different combination forms depending on soil conditions as well as the bearing capacity requirements. Considering combination features of JPP，a perfect elasticplastic model is used to simulate nonlinear of soil around pile，and an elastic model is used to simulate load transfer behavior of interface between soil-cement and core pile，and a double broken line function is used to simulate hardening characteristics of soil under pile tip. Based on the load transfer method，taking into account interface friction betweent soil-cement and core pile，and interface friction between soil-cement or core pile and soil around pile，a simplified calculation method is presented to analyze load transfer of different combinations of JPPs. The feasibility and reliability of the method are verified by the model test results. Load transfer mechanism of JPP is analyzed by the proposed simplified calculation method；and the main factors of JPP load transfer，different combinations，different soil-cement thicknesses，different elastic moduli of soil-cement，and different stiffness coefficient ratios，are analyzed comparatively. The calculation results show that，in view of the bearing capacity，settlement control and costs，the sub-combination JPP has better bearing capacity；increaseing soil-cement thickness can effectively improve the bearing capacity of JPP；the deformation of JPP is controlled by high-strength core pile；elastic moduli of soil-cement are less affected on JPP deformation.
