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Fatigue life prediction method for high-modulus asphalt mixture pavement

A technology of fatigue life prediction and asphalt mixture, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of not considering the influence and difference of fatigue life, and achieve a wide range of applications and reliable calculation results Effect

Inactive Publication Date: 2015-03-25
CHONGQING JIAOTONG UNIVERSITY
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Problems solved by technology

However, these methods do not consider the influence of the actual temperature gradient and the actual axle load distribution of the high modulus asphalt mixture on the fatigue life of the high modulus asphalt mixture after pavement, resulting in a large difference between the theoretical calculation value and the actual value

Method used

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  • Fatigue life prediction method for high-modulus asphalt mixture pavement
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  • Fatigue life prediction method for high-modulus asphalt mixture pavement

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Embodiment Construction

[0036] attached figure 1 It is a schematic diagram of the process of the high modulus asphalt mixture pavement fatigue life prediction method of the present invention, as can be seen from the figure, the high modulus asphalt mixture pavement fatigue life prediction method of the present invention is based on the structural temperature distribution of the high modulus asphalt mixture pavement, the pavement material The dynamic modulus and temperature axial load distribution are the basic parameters; the fatigue strain equation is fitted with the results of the indirect tensile fatigue test In the formula, N f is the number of load actions during fatigue failure, a is a parameter, ε x is the horizontal strain, and b is the parameter; use ANSYS software to construct the finite element model of the pavement structure, and calculate the maximum tensile strain at the bottom of the layer in different axle load levels and different temperature zones; according to Miner’s fatigue cum...

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Abstract

The invention provides a fatigue life prediction method for a high-modulus asphalt mixture pavement. The method comprises the steps that structural temperature distribution, pavement material dynamic modulus and temperature axle load distribution of the high-modulus asphalt mixture pavement serve as basis parameters; a fatigue strain equation is fit according to an indirect tension fatigue test result; ANSYS software is adopted to construct a pavement structure finite element model, and maximum tension strain of a bottom layer at different axle load levels in different temperature regions is calculated; according to the Miner fatigue cumulative damage rule, fatigue cumulative damage results of a high-modulus asphalt mixture at different axle loads and different temperatures are calculated according to the formula: . The fatigue life prediction method for the high-modulus asphalt mixture pavement has the technical advantages that temperature gradients and axle load distribution of the asphalt mixture pavement are fully considered, an accurate prediction model is established, the process and law of fatigue attenuation of the asphalt mixture are accurately described, the application range is wide, and calculation results are reliable, so a more reliable method is provided for structural design of the asphalt pavement.

Description

field of invention [0001] The invention relates to the technical field of road engineering construction, in particular to a method for predicting the fatigue life of a high modulus asphalt mixture pavement. Background technique [0002] High modulus asphalt mixture is a new type of road material with excellent road performance. The design concept of high-modulus asphalt mixture is to increase the modulus of asphalt concrete, thereby improving the high-temperature deformation resistance of the pavement, reducing the strain of asphalt concrete under vehicle load, improving the fatigue performance of asphalt concrete, and prolonging the service life of the pavement. , to improve the effect of service quality. [0003] High modulus asphalt mixture (HMAM) appeared in France in the 1980s, and was dubbed the name of special asphalt treatment gravel for pavement (GBTHP) and obtained related patents. According to the definition in the French NFP-140 standard: Only when the dynamic ...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 梁乃兴曹源文黎晓赵毅郑嘉孙凤徐建平郑易楠
Owner CHONGQING JIAOTONG UNIVERSITY
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