Application of cohesive zone model to simulate reflective crack of asphalt pavement

ZHOU Zheng-feng; PU Zhuo-heng; LIU Chao

doi:10.19818/j.cnki.1671-1637.2018.03.001

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ZHOU Zheng-feng, PU Zhuo-heng, LIU Chao. Application of cohesive zone model to simulate reflective crack of asphalt pavement[J]. Journal of Traffic and Transportation Engineering, 2018, 18(3): 1-10. doi: 10.19818/j.cnki.1671-1637.2018.03.001

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ZHOU Zheng-feng, PU Zhuo-heng, LIU Chao. Application of cohesive zone model to simulate reflective crack of asphalt pavement[J]. Journal of Traffic and Transportation Engineering, 2018, 18(3): 1-10. doi: 10.19818/j.cnki.1671-1637.2018.03.001

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Application of cohesive zone model to simulate reflective crack of asphalt pavement

doi: 10.19818/j.cnki.1671-1637.2018.03.001

ZHOU Zheng-feng^{1, 2, 3
,},
PU Zhuo-heng^{1, 2, 3},
LIU Chao^{1, 2, 3}

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
3.
Key Laboratory of High-speed Railway Engineering of MOE, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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Author Bio:
ZHOU Zheng-feng(1981-), male, associate professor, PhD, zhouzf126@126.com
Received Date: 2018-02-03
Publish Date: 2018-06-25

Abstract

Abstract

Based on ABAQUS, the constitutive model and parameters of 3 Dcohesive element were analyzed by using the traction-separation law. By applying the displacement load on a cohesive element, the results of numerical simulation and theoretical computation of the stresses, displacements and strain energies were compared to verify the reliability of cohesive element under various combination rules of initial damage and complete failure in the loading process. In the asphalt surface course on the cracked base course, the cohesive elements were laid at the positions where reflective cracks might occur, the cohesive zone model was employed to simulatethe cracking procedure, and the effects of the parameters of cohesive element and the thickness of asphalt surface course on the crack propagation were studied. Analysis result shows that when the cohesive layer stiffness decreases from 40 to 20 GN · m^-3, the ratio of separation displacements of cohesive layer under unilateral and symmetric loads increases from 1.52 to 13.52, and the ratio of shear displacement to normal displacement of cohesive layer increases from 1.52 to 11.32 under unilateral load, which indicates that the asphalt surface course tends to appear type-Ⅱ shear cracks as the stiffness of potential cracking area decreases. Under traffic load, the cracking path of asphalt pavement is as follows: first, the damage begins at the bottom of asphalt surface course and propagates upwards; next, other damages occur near the loading area and propagate downwards; finally, after penetrating the entire surface course, the continuous decrease of potential fracture zone's stiffness will cause crack to propagate along the transverse direction of the pavement. In the increasing process of surface course thickness from 16 to 22 cm with a 2 cm-gradient, the separation displacement of cohesive layer decreases by 32.31%, 15.22% and 9.63%, respectively, and the ratio of shear displacement to normal displacement decreases from 3.24 to 1.10, which indicates that the increase of surface course thickness can effectively mitigate the propagation of reflective crack, although the effect decreases as the thickness increases. Furthermore, the increase of surface course thickness makes the reflective crack gradually transfer from type-Ⅱshear crack to type-Ⅰ-Ⅱmixed crack.
- pavement engineering,
- asphalt pavement,
- reflective crack,
- cohesive zone model,
- finite element analysis

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References

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Application of cohesive zone model to simulate reflective crack of asphalt pavement

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