Double-block To Ballasted Track Chuangban Concrete Deformation Properties Of Its Finite Element Analysis

With the rapid economic development of the China and the need to enhance overall national strength, the construction of the high-speed railway has become the direction of one of the key national construction in recent years. In the high-speed railway construction, the structure of the Ballastless is stable better, overall economic efficiency high, and has many other significant advantages. So high-speed railways had been adopted widely in our country and abroad.The double-block ballast-less track is one of the most widely used structure on high-speed railway around the world. Slab, continuous casted with pumping concrete, is an important part of double-block ballast-less track. The cracking phenomenon of slab is serious, and the crack width and spacing requirements exceed the current technical conditions, which affects the performance and service life of ballast-less track structure.Meanwhile, cracks on the concrete slab, there are excessive influencing factors of cracking on continuous casting concrete, and its formation mechanism is also different in varying stage. The influence factors and mechanism of cracking on slab concrete from the view of material properties and structural characteristics of slab were explained in the article. So, work are mainly aspect from the material, environment and structure.1. The estimation formula of the compressive strength, splitting tensile strength under standard curing increased with age were be cleared.2. The method of the test of the shrinkage of Concrete, strength level and environmental conditions on the shrinkage of Concrete were analysis and researched. Prediction model function was improved based on the results of the test.3. The recommended test method in appendix B of the GB23439-2009 was high reliability. Intensity level is not very different at the early age of concrete shrinkage rate. For the concrete of the C40,the drying shrinkage can be to 450×10-6. With the growth of the age, the shrinkage of the high strength grade of the Concrete would be slightly lower than the lower strength grade of the Concrete.4.Tensile and compressive creep relationships of the concrete of the track bed were briefly researched institute. By the improved design, the tensile creep of the Concrete was studied. Also, the numerical simulation of the creep of the Concrete was discussed. Under the stress level the of 0.7, the creep of the lower strength grade of Concrete was higher. With the reduce of the relative humidith, the tensile creep of Concrete was increased slowly. For the concrete of the C40,the tensile creep can be to 95×10-6. The composite index of functional from the Origin 8.0 recommended was more in line with the results. The result is5. The paper analyzes the influence law of different constraints and concrete material properties on stress and strain distribution inside the concrete slab, under drying shrinkage and temperature shrinkage by establishing a finite element model of concrete slab. The areas around the sleeper and the corner near the outboard of slab will generate great stress and strain; the difference of the stress of the surface in the Double-Block ballastless track was less obvious.