The Calculate Method Of Track On Solid Bed And Study Of Design Parameter

With the development of railway and urban transportation, ballasted track incarnate some shortcomings, such as too much maintenance work, high probability of distortion and so on. So many countries have researched and developed kinds of ballastless track, which could reduce even do not need maintenance work. Track on solid bed is a kind of ballastless track; it is widely used in railway tunnel, terminals, special line and urban railway transportation.In this paper, toward double-side channel reinforced concrete bearing block track on solid bed in tunnel, the maximal moment and bend stress in longitudinal and latitudinal is calculated utilizing existing continuously support double beam model and beam on elastic foundation model. The bend stress is also calculated using the solid model established by a Finite Element software ANSYS. Four parameters such as fastener rigidity, depth of track on solid bed, space between fasteners and resisting coefficient of wall rock foundation are studied and obtained their reasonable value range through analysis and compare.In this paper, the stress of the track slab with and without inverted arch is calculated and analyzed using a solid model established by Finite Element software-ANSYS, and the mechanics characteristic of the track slab is educed. After compare with the result of the foundation beam model, we can say the difference between the boundary condition of the two models is the main cause of the result discrepancy. When calculate the longitudinal stress of the track slab on inverted arch, the selection of the resistance coefficient of the wall rock in double beam foundationmodel is incompatible, and the influence of the distortion of the backfilled concrete and the inverted arch is not taken into account is another defect of the double beam model. This paper advise use foundation model to design because the safety capacity is high, a more detailed analysis can be carried through using solid model if necessary.A quadruple continuously supported beam model is brought forward and established to analyze the track slab on inverted arch more careful. Through the comparison between the three model' s result, we can draw a conclusion that we can use double and quadruple continuously supported beam model to calculate the longitudinal stress of the track slab on inverted arch, and a more detailed stress analysis can be carried through using solid model established by finite element software if necessary. The foundation' s elastic resistance coefficient should equal to that of the level II wall rock.