Crts I Plate Rail Temperature Force On The Soil Subgrad

At present, we are focusing on large-scale construction of the high-speed railway and the special line for passenger transport, while the ballast-less track have the prominent advantage of better structure stability, better structure durability, better stiffness uniformity,better track regularity, less maintenance and relative mature of technology, and has gradually become the first choice of the high-speed railway. However, the researches on the ballast-less track layed on the soil formation are still at the stage of theoretical research and analysis test, while Slab Ballastless Track on the soil subgrade is the rise of large-scale, so the force analysis on slab track layed on the soil formation have an important practical significance.This thesis focuses on the the slab track of CRTS I layed on soil formation, according to Finite element theory, the entity model of the slab track layed on the soil formation is built, by ANSYS. In the modeling, because of the temperature force of the ballasted track board, model will divided board into10layers and give a different temperature for each layer, In form of the temperature force working on the track board. The track board and CA mortar using a paste of the simulation, in order to ensure consistency between the displacement of the contact surface. It is unreasonable to consider that concrete base is rigid. Because it has great rigidity, and direct contact with the CA mortar, and has the same coefficient fo linear expansion with the track board. Base contacted with subgrade, friction coefficient is0.35. Temperature warping stress calculat "hot to cold" and "cold to hot" two cases. In Order to make the calculation simplify the two cases’ temperature gradient take the same value and distribute to the linear in the crosssection. For the load of the two cases temperature gradient take of0.5℃/cm, the board’s thickness is0.19m, model take it as10℃. So we get the stress of the board, CA mortar, concrete base and soil subgrade in the temperature gradient. Through the calculation of the above model, the temperature gradient has a great affect on the orbital plate, CA mortar and concrete support layer.By comparing the force and deformation status of the slab track under different temperature gradient, select flat track’s two temperature gradient states to study that calculate the force of the convex block units and the resin layer of the CRTS I flat track that on the soil subgrade. So we can research the affect of resin layer elastic modulus to the convex block and the resin layer. Convex block resin layer in this article only to consider the role of the stress caused by the temperature under the force due to board telescopic. When the resin layer’s elastic modulus takes25MPa、50MPa、100MPa researching the affect of theresin layer’s elastic modulus on the convex block. The analysis showed that the greater the resin modulus, faster increase of the force of the resin itself and The more unfavorable to the resin layer. Resin elastic modulus changes has a little effect on the force of the convex block station.