Static drill rooted pile (SDRP) is a compound pile consisting of soil-cement and prestressed pipe pile. For the purpose of knowing the deforming performance under lateral load

three sets of amount six piles static tests are carried out. The first set is 600- 750 mm SDRP (pipe pile diameter 600 mm and drilling diameter 750 mm); the second 800- 900 mm SDRP (pipe pile diameter 800 mm and drilling diameter 900 mm); and the third bored piles with diameter 1 000 mm. The second set is of very close in geometry size but different materials with the third set

and the first set is of same materials but different geometry size with the second set. Three findings are carried out after comparing lateral deformation ratios and lateral loads to deformations and deformation gradients

which are firstly bored pile is better than SDRP in the elastic stage but gradually reversed in the subsequent stages

secondly SDRP is stronger at deformation resilience than bored pile

and thirdly pile’s lateral deformation is nearly linear to sectional bending stiffness in the elastic stage. In order to promote lateral load-bearing capacity in elastic stage

the better way was substituting bored pile to SDRP with same diameter but not enlarging SDRP’s diameter.