Improvement Mechanism
1) Pile effect:The pile with higher strength can reduce the additional stress of the foundation soil through the stress concentration.
2) Cushion effect: The stress exerted by the foundation is not only passed down from top of the pile, but also through the lateral deformation of the pile body to the surrounding soil. The composite foundation is equivalent to a stiffened artificial cushion with better diffusion properties.
3) Drainage: The good drainage performance of the pile helps to consolidation the viscous soil with high moisture content, thus improving the strength of cohesive soil. At the same time, when the building load applied, the super-void water pressure generated in the foundation soil can dissipate rapidly, so that the consolidation settlement can be completed quickly.