Research methods：According to the standards and regulations, the analyses are made for the previous constructions of special subgrade and bridge beam structure and the researches are done on the advantages and disadvantages of all kinds of structures. For the structural design parameters of flat-slab beamless pile structure which can be directly used for the low embankment of soft weak subgrade of passenger dedicated line, the analyses are made for the all performance indexes of the structure under the static and dynamic conditions by using a space calculation model.
Research results：The checking calculations show the internal force and stress in the slab of the structure are small, it is feasible to support the beamless slab by prefabricated prestressed concrete pipe pile, and the structure design can be made in accordance with the distribution of reinforcements to be laid. The dynamic analyses of the structures of train and track show the structure can satisfy the requirements of safety, stability and comfortableness for high-speed train.
Research conclusions: As a structure of low embankment of soft weak subgrade，beamless slab can satisfy the requirements of ballast and ballastless tracks and can control the structure's settlement. Adapting this structure, it is unnecessary to roll the subgrade with the features of simplifying construction procedures, easy construction，aiding environment protection and saving land, so the good social and economic benefits can be obtained by application of this technology.
2007, Vol. 24 
