瀝青路面長(zhǎng)壽命微罩面層間耐久性數(shù)值模擬研究
[Abstract]:With the rapid development of pavement preventive maintenance technology, asphalt pavement preventive maintenance technology in various countries, including our country, has made a lot of achievements in prolonging the service life of the road and reducing the investment of overhaul. However, due to the fact that there are still many shortcomings in the application of all kinds of preventive maintenance technologies and the effect of prolonging the service life of pavement is still not obvious, the long life micro overlay technology, which emerges as the times require, has a long life. Enough interlayer combination durability to solve this kind of problem of preventive maintenance. In this paper, the long life micro overlay (LLMO) is taken as the research object, and the interlaminar numerical analysis model is established to analyze the stress and damage law between the micro overlay and the pavement under different load conditions. Compared with the calculation results of the interlayer continuous model, the rationality of the established model is verified. On this basis, the shear fatigue life of micro-overlay-pavement interlayer and asphalt thin-layer overlay-pavement interlaminar shear fatigue life is estimated. The main research contents are as follows: (1) different interlaminar bonding models and interlaminar durability research methods are compared and analyzed, and the cohesion model suitable for asphalt concrete interface is studied. Then the failure model of interlaminar delamination based on progressive damage theory is introduced. The model is applied to the simulation of direct shear test in laboratory and verified according to the existing literature. (2) the interlaminar bond interface (surface-based cohesive behavior) model) based on delamination failure theory is established by using ABAQUS finite element software. It is used to simulate the interlaminar contact after the implementation of microoverlay, to study the variation of interlaminar stress and the form and law of interlaminar damage in the structural layer under standard axial load, and to verify the rationality of the interlaminar bond interface model compared with the interlaminar continuous model. The forms and laws of interlaminar stress and interlaminar damage in pavement structure with different load conditions are analyzed. (3) under the action of medium traffic repeated load, The failure mode of interlaminar bonding force loss caused by shear fatigue between microoverlay and existing asphalt pavement is studied. An interlaminar bond interface model based on delamination failure theory is established to analyze interlaminar shear fatigue. The results show that there is no delamination failure during the loading time, which is consistent with the actual service life of the microcover. In addition, the interlaminar model of asphalt thin layer overlay and existing asphalt pavement is established, and the service life of interlaminar shear fatigue life is 3.6 years, which is much lower than that of micro overlay. (4) for urban road surface, Referring to the checking formula of allowable shear strength, the calculation formula of shear fatigue life between pavement structure layer and overlay layer is given, and the micro overlay and pavement layer under repeated load are obtained respectively. Asphalt thin layer overlay-pavement interlaminar shear fatigue life.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U416.217
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