Abstract：Research purposes:Considering the characteristics of the ballastless track on soil subgrade, the finite element analytical model of slab ballastless track on soil subgrade was established to study the reasonable track structue and to analyze the effects of base dimensions on the mechanical property of slab track structure on soil subgrade, for purpose of providing references in the application and design of ballastless track structue on soil subgrade. Research conclusions:(1) Compared with the solid slab, frame slab can effectively reduce the stress and displacement of the track slab under the action of load, the maximum stress and displacement of frame slab decreased about 16% and 11% respectively, meanwhile, the dead load of the frame slab decreased about 30%, and laying the frame slab on soil subgrade has a high level of techno-economic advantages. (2) The mechanical property of frame slab ballastless track is influenced more by the thickness of base than by the width. (3) The change of the base dimension won't affect the stress distribution rules of the frame slab. (4) The reasonable recommended values of the width of roadbed on soil subgrade is about 300~320 cm and the thickness is about 30 cm. It's not necessary to increase the size of base for the purpose of reducing the stresses of the structure. (5) The research results can provide theoretical basis for the design and maintenance of ballastless track.
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2014, Vol. 31 
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