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A Numerical Simulation Method for Fatigue Cracking of Pavement Structure Based on Extended Finite Element

A technology of extending finite element and pavement structure, applied in the field of road engineering data processing, which can solve the problem of difficulty in accurately predicting the deterioration process of pavement performance.

Active Publication Date: 2021-07-30
SOUTHEAST UNIV
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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.

Method used

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  • A Numerical Simulation Method for Fatigue Cracking of Pavement Structure Based on Extended Finite Element
  • A Numerical Simulation Method for Fatigue Cracking of Pavement Structure Based on Extended Finite Element
  • A Numerical Simulation Method for Fatigue Cracking of Pavement Structure Based on Extended Finite Element

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Embodiment Construction

[0030] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0031] The numerical simulation method for fatigue cracking of route structure based on extended finite element method provided by the present invention, its process is as follows figure 1 shown, including the following steps:

[0032] (1) Carry out corresponding indoor material tests to determine the mechanical and thermal parameters of road materials under the condition of no damage. Road materials include pavement and roadbed materials. The measured mechanical parameters include elastic modulus and Poisson's ratio in a wide temperature range, and the relationship between elastic modulus, Poisson's ratio and temperature is fitted to consider the impact of tempe...

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Abstract

The invention discloses a numerical simulation method for pavement structure fatigue cracking based on extended finite element, comprising: determining mechanical parameters, thermal parameters, and fatigue life data of materials through experiments; fitting and obtaining a fatigue damage model suitable for corresponding pavement materials; using the fatigue model Realize the accumulation of fatigue damage to the unit material; define the crack nucleation initiation criterion of the damaged material; simulate the temperature field; simulate the fatigue cracking process of the pavement structure. The present invention considers the mutual coupling and interaction between fatigue and cracking, and adopts the transient temperature field in the simulation, more accurately simulates the influence of temperature on the fatigue cracking of the road surface; realizes fatigue-cracking of road materials under approximate actual road surface conditions The whole process simulation can more effectively use the data of indoor tests for the prediction of road fatigue life, and provide basis and guidance for road design and maintenance.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/13G06F119/14
CPCG06F30/13G06F30/23G06F2119/06
Inventor 马涛童巨声丁珣昊林子豪张伟光
Owner SOUTHEAST UNIV
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