As a new foundation for wind turbine on land

piled beam-slab foundation has a broad prospect .The optimized structures properly can reduce costs. To investigate the bearing and deformation characteristics of piled beam-slab foundation under vertical loads under different raft rigidities

a large-scale model test is carried out

which also research the ratio of the force carried by pile and that carried by soil. The research shows that within the range of work load

average pile axial force increases with the increase of the raft rigidity; the axial force of the outer-ring-piles increases while the axial force of inner-ring-piles reduces. The moment of the ring beam and the ribbed beam decrease when the rigidity continues to increase after a certain value

there is little effect on axial force

moment of the ring beam and ribbed beam. With the increase of the stiffness of the beam-slab foundation

the differential settlement of the foundation decreases. However

this trend will become insignificant as the stiffness increases to a certain value. The variety of rigidity of the piled beam-slab foundation could make a difference on the uniformity of subgrade reaction. Besides

there is an optimal stiffness that can make the foundation reaction distribution most uniform. In the experiment

the subgrade reaction distribution of the piled-beam-slab foundation with 12 beams is more uniform comparing to the foundation with 6 piles and block foundation. And there is an optimal rigidity for piled beam-slab foundation

which makes the soil beneath the foundation beared more loads while piles do less. The distribution of piles and beams produces mutual effects on each other. When the distribution of beams changes

the forces of the pile top will be affected. And piles under the beams will also result in beam stress redistribution. In actual project

the rigidity of caps should be optimized and the research results can provide reference for the design of piled beam-slab foundation.