ABSTRACT
Pile-supported slab is a new type of subgrade structure, its working characteristics are still unclear. Based on the model similarity theory, the static horizontal loading model experiments and dynamic vertical excitation experiments of two spans were carried out. The characteristics of pile-supported slab are analyzed through the coupling model of train and pile-supported slab. The results show that: (1) The subgrade soil has an obvious horizontal restraint effect on the pile, and the variation of pile-soil interaction along the pile is different from bridge pile foundation. (2) Under the vertical excitation load, the supporting effect of the lower soil on the supported slab is obvious. (3) The pile, slab and soil of pile-supported slab have complex interaction, and the state equilibrium achieved after a certain number of dynamic actions. In general, the design of pile-supported slab adopted by high-speed railway is redundant, which has a lot of optimization space.
