| Ballastless track structure due to the regulating ability is limited. On the basis of the lower settlement deformation is sensitive, so the subgrade on the laying on of in ballastless track, the core problem is to control the line longitudinal differential settlement. However, with the development of China’s economy, large-scale exploitation of underground resources, regional settlement problems have become increasingly prominent, which has greatly hindered China’s high-speed railway construction process. This paper in Beijing Shanghai high speed railway DK6+786-DK412+062 period a total of 405.276km settlement monitoring results as the sample data, combined with the existing literature, to ensure for the purpose, system of regional subsidence of CRTS-II type non ballasted track structure influence line safe operation and guiding the late maintenance.First of all, analysis of the measured settlement data, the typical settlement type of the extraction area is "angle type" and "sine type", and analyzed the structure characteristics of various types of typical settlement, and then put forward the simplified linear.Secondly, combined with CRTS-II type plate structure characteristics of non ballasted track, analysis of regional settlement may cause structural damage, and to determine the CA mortar layer maximum tensile compressive force, track structure static geometry and structure layer between the hanging air volume as the control factors.Finally, considering regional subsidence deformation of CRTS-II type slab ballastless track foundation mechanics model, based on the force and deformation of two aspects of calculation results were compared and analyzed. To infer the type of disease that may appear in the track structure under different conditions, and puts forward corresponding regional subsidence volume allowed limits. |
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