<p>In this paper, a new type of composite pile called mud absorption (MA) pile was proposed, which is composed of a precast core pile and the paste slurry. Based on the field static load test and three-dimensional coupled discrete element method-finite difference method (DEM-FDM) simulation, the compressive bearing characteristics and load transfer mechanism of the MA pile were investigated. The results indicate the MA pile is the friction pile with higher bearing capacity. The vertical load on the pile top is jointly borne by the core pile and the paste slurry and transferred to the surrounding soil, forming a composite structure with a stiffness gradual that transitions from strong to medium to weak. By monitoring the displacements of the core pile, paste slurry, and the surrounding soil, it has been demonstrated that the core pile and paste slurry work synergistically. This synergy effectively enlarges the pile radius and enhances the bearing capacity of the pile foundation. The effects of paste slurry properties and the ratio of core pile side length to pile diameter on the bearing capacity were finally investigated, providing assistances for the design and application of MA piles.</p>