Structural Response Analysis Of Combined Base Asphalt Pavement Based On Three-dimensional Continuous Finite Layer Method

With the widespread use and use of composite asphalt pavement construction in China,the initial disease of the asphalt surface and improved the durability and performance of the road.However,compare d with the development plan of durable asphalt pavement structure proposed by our country,There are still some shortcomings in the structure of the asphalt pavement,and the structure and materials need t o be further optimized and improved.Therefore,we designed the composite asphalt pavement structure as the background,modified the original composite asphalt material with high-performance polypropylene fiber,and analyzed it based on the pavement performance test and dynamic modulus test.Further,the 3D-Move analysis program analyzes the main structure of The final and explained use of the complex structure,the difference in mechanical properties.One analyzed that they had the required subject structures in the figure as an asphalt design The specific research content of this paper is as follows:1.First,Reference,engineering practice and give a reasonable application gradation of cement stabilized crushed stone foamed asphalt mixture mixing water amount is obtained through the inorganic combination in the heavy asphalt mixture.Pressure strain test.Later,dry and wet cracking test for strength the high-performance asphalt blend of polypropylene fiber with a length of 30 mm was carried out,and the optimal asphalt mixture of the asphalt obtained by blending0,05%,0.75%and1.0%fiber was obtained.High-performance polypropylene fiber.These are 2.7%,3.3%,3.5%,3.8%and 3.8%respectively.Finally,through tensile testing,low temperature bending,water immersion and freeze melting,we found that the high performance polypropylene fiber content is 0.75%and the length is 20 mm with good high temperature stability.0.5%fiber content and 40 mm fiber length have the best resistance to low temperature cracking.0.5%fiber content and 30 mm fiber length have the best water resistance.2.Under the optimum fiber volume and length,according to the stress curves obtained from dynamic modulus test,the dynamic modulus and phase angle of polypropylene cement foam stabilized high performance asphalt mixture were obtained.Combined with the three-dimensional Move analysis software,the pavement structure analysis model was constructed,and the mechanical properties of the composite base pavement structure before and after modification were analyzed.3.The current design standard for asphalt pavement structure assumes that the life of the asphalt layer is controlled by the tensile stress at the bottom of the asphalt layer.Permanent deformation of asphalt paving is controlled vertically pressure indicator and the surface pressure on the track bed.The life of fatigue cracks in the inorganic connecting layer is controlled by the tensile stress index of the inorganic connecting layer.Based on the design control index of asphalt pavement,the influence factors such as thickness change of upper base,vehicle axle load change and temperature change of upper base are calculated and analyzed.