Extended finite element-based numerical simulation method of fatigue cracking of pavement structure

Abstract

The invention discloses an extended finite element-based numerical simulation method of fatigue cracking of a pavement structure. The method includes: determining mechanical parameters, thermal parameters and fatigue life data of material by experiment; obtaining a fatigue damage model, which is suitable for use in the corresponding pavement material, by fitting; utilizing the fatigue model to realize accumulation of fatigue damage for unit material; defining a crack nucleation initiation criterion of the damaged material; simulating a temperature field; and simulating a fatigue cracking process of the pavement structure. According to the method, mutual coupling and mutual influences of fatigue and cracking are considered, the transient temperature field is adopted in simulation, and influences of temperature on the pavement fatigue cracking problem are relatively accurately simulated; and fatigue-cracking whole-process simulation of the road material under approximatively realistic pavement conditions is realized, data of indoor testing are more effectively used for prediction of road fatigue life, and a basis and guidance are provided for design and maintenance work of a road.

Description

technical field [0001] The invention belongs to the technical field of road engineering data processing, and relates to a pavement data simulation method, more specifically, to a numerical simulation method for pavement structure fatigue cracking based on extended finite elements. Background technique [0002] The fatigue cracking behavior of asphalt pavement is a complex and comprehensive problem. Due to the large-scale characteristics of the actual pavement, the fatigue characteristics of asphalt pavement are difficult to obtain by laboratory tests. However, the approximate method of extending the indoor test to the actual road surface is very artificial, and it is difficult to obtain accurate road fatigue cracking life. Moreover, the purely experimental method is time-consuming and laborious, especially for large-scale experimental roads and full-scale experiments. [0003] At present, there have been many researches on the numerical simulation of road fatigue life in te...

AI Technical Summary

Problems solved by technology

However, pavement fatigue and cracking are not independent processes, and it is difficult to accurately predict the pavement performance degradation process by studying the fatigue behavior or cracking behavior of the pavement structure alone.

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