This paper submits a proposed method of analyzing apiled-raft foundation subjected to general loadingas the
requirements of design for rafts enhanced with piles. In this method, the analysis considers a raft incontact with the ground
soil and it can be used for the problems of the variation of soil modulus from layer to layer. Moreover, this method has the
advantage that the data is easy to prepare and does not involve creating large meshes as would be required for finite
element solutions. Regardless to other factors, theanalysis shows that the stiffness ratios (E
pile
/E
soil
and E
raft
/E
soil
) and pile
spacing (S/D) play significant effects on the piled-raft displacements and loadings. To verify the reliability of this method,
the obtained results of FLAC-3D are compared with the field tests of a large scale group tested under horizontal loading.
Good agreement between field loading and the proposed method is demonstrated.