| With rapidly developing of China’s economy, an increasing investment is made inroads building. Because of its extraordinary advantages, asphalt pavement acquires moreand more market shares in the construction of high-grade highways and municipal roads.However, various damages to asphalt pavement have heavily disturbed road workers, andhow to solve these damages and prolong the service life of roads gradually develop intoserious challenges that road workers have to face. With the developing of trafficchanneling, overloading, and the increasing requirements for riding comfort, ruts as themain damage source have produced increasingly prominent problems.Rutting research is a very complex research task. Because it is necessary to masterthe basic characteristics of the asphalt mixture, while the basic characteristics of asphaltmixture are closely related to vehicle loads, and the temperature and humidity to whichasphalt surface is exposed; on the other hand, pavement structure, material properties ofthe mixture, interlayer contact conditions and other factors have important impacts on theruts. However, for specific projects, vehicle loads and the temperature and humidityconditions to which each project is exposed are known and unchangeable. Hence the onlymethod is to understand the properties of pavement structure and mixture materials suchas thickness, modulus, etc., and then conduct further analysis the rutting problems.Therefore, it is the fundamental starting point and effective premise for solving therutting problem to study rutting problems of asphalt pavement based on road structuralcharacteristics.However, almost all the rutting researches on the vehicle load and layer contact areconducted too simply, which mainly manifests as follows:1) In terms of vehicle load, it is simplified into a simple circular uniform loaddistribution. While many studies have fully proved the non-uniformity of vehicle load,the irregular shape of contact area instead of circular or rectangular one. 2) In terms of the interlayer contact, it is either assumed fully continuous orperfectly smooth in recent studies, while in fact, it is neither completely continuous norentirely smooth.To this end, there are many areas worth exploring about the problem of asphaltpavement rutting. On the basis of previous studies, the topic will fully considerate thelayer functions of pavement structure and combine with the actual tire-road contactinterface properties and structural characteristics of the rutting problems for the furtherresearch and analysis, aimed at providing a solution to the problem:1) Establish a three-dimensional finite element model for rutting ANSYScalculation, select calculation indicators and develop a method of data processing.2) The contribution rate of the asphalt pavement rutting of asphalt layers of eachtype, and the contribution rate is affected by modulus and thickness variation particularlyby the modulus.3) It can be seen from the study of this article, modulus have greater impact onchanges in the area of compressive strain, while the rutting period generally occurs inthe summer heat, temperature changes caused the complex changes of modulus. Thus itcan be inferred, the compressive strain is the most important factor in the rut;development of lateral flow along rutted, in turn, caused by transverse shear strain.Therefore, the present study may reflect to some extent, rutting is caused by joint actionof compressive strain and transverse shear strain.4) The size of the lateral force in the surface layer of shear strain to rut contributionrate, as well as the contribution of the compressive strain Rut layers of influence aresmall; impact of light trucks on the rutted,are far beyond the current generalunderstanding which should be seriously considerate; asphalt pavement incompletecontinuous between surface layers almost no effect on the rutting contribution rate, butthe mutant strain of the surface is connected to the pavement structure will inevitablycause damage. |
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