Using the composite foundation project involving cement-soil mixing pile treatment for the aeolian sand layer in Yulin,Shaanxi Province as the context,numerical simulations of static load tests on this composite foundation were performed using ABAQUS finite element analysis software.The study aimed to explore the load transfer mechanism and deformation characteristics of the pile-soil system in aeolian sand composite foundations.The results show that appro-priately adjusting the thickness of the cushion layer can effectively reduce stress concentration at the pile top and de-crease the pile-soil stress ratio.Increasing the modulus of the cushion layer can reduce the settlement of the composite foundation and enhance its bearing capacity.The side friction resistance of the pile with a cushion layer is negative near the pile top,rapidly decaying to zero with depth,and then turning into positive friction resistance.Corresponding-ly,the additional axial stress of the pile body first increases to its peak near the pile top,and then gradually decreases along the depth.There is a critical pile length when using cement-soil mixing piles to treat aeolian sand foundations.Under the same load level,as the pile length increases,the pile-soil stress ratio initially increases and then stabilizes,while the distribution of lateral frictional resistance along the pile body also tends to stabilize with the increase in pile length.The characteristic values of the bearing capacity of the aeolian sand composite foundation,designed according to the specifications,show a safety bias with a significant margin.
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