Abstract:The static drill rooted nodular pile is a kind of composite pile foundation by inserting the prefabricated nodular pile into the cemented soil. The FEM models of the PGPN (pre-bored grouting planted nodular) pile under compression and tension were established using ABAQUS, and the reliability of the model was verified by comparing the calculated load-displacement curves with the field test results. The axial bearing characteristics of the pile were analyzed by using numerical calculation method. The results show that the bearing characteristics of the PGPN pile under compression are better than that of pile under tension. The nodes along pile shaft can be closely combined with the surrounding cemented soil and that nodes do not bear the load from the soil directly. The cemented soil along the pile shaft only transfers the shear stress between pipe pile and soil. When S=60 mm, the pipe pile tip resistance accounts for 25.8% of the total pile tip resistance for pile under compression, and it accounts for 16.6% of the total pile tip resistance for pile under tension, which is less than the load borne by enlarged cemented soil pile base. When the nodular pile length ratio increases from 0 to 0.375, the ultimate bearing capacity of the pile under compression increases from 3 045 kN to 6 173 kN, and the ultimate bearing capacity of the pile under tension increases from 1 910 kN to 2 441 kN. At the same time, the enlarged pile base resistance increases significantly. However, when the length ratio is increased from 0.375 to 0.625, the ultimate bearing capacity, total pile shaft capacity, pipe pile tip resistance and enlarged pile base resistance are not improved obviously.