1.The Second Survey and Design Institute of China Railway, Chengdu , Sichuan 610031, China; 2. Southwest Jiaotong University, Chengdu , Sichuan 610031, China
Abstract：Research purposes: This paper takes ballastless track turnout of No.12 Suining-Chongqiag Line as example and analyzes the stress and deformation behavior of foundation under ballastless track turnout. And it provides a theoretical reference for the design of ballastless track bed in turnout area.
Research methods: Based on multiple and beam theory, stress module of foundation under ballastless track in turnout area is established with finite element method. The paper analyzes the foundation stress under ballastless track in turnout area in the light of the feature of contact condition of ballastless track slabs.
Research results: Under the same load condition, the tensile stress of ballastless track slabs without close connected is bigger than that of slabs with close linkage structure. When it is closely linked between slabs of track, whether the track slabs connected or not, it influents little on the press-stress of track slabs and the bending moment of subgrade surface.
Research conclusions: Established finite element model of ballastless track in turnout area, analysis has been done to the track response under trainload action of under ballastless track bed in turnout area. It also analyzes and calculates the maximize bending moment of track slab cross section of independent and continuous track bed in turnout area which gives reference for the design. There is little influence on the press-stress of track slabs whether the track slabs connected or not, so it should make reasonable selection according to the characteristics of independent and continuous track bed when design track bed.
2006, Vol. 23 
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