|Table of Contents|

Mechanical response analysis of semirigid asphalt pavement inNorthern Shaanxi under coupling field(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年5期
Page:
1-11
Research Field:
道路工程
Publishing date:

Info

Title:
Mechanical response analysis of semirigid asphalt pavement inNorthern Shaanxi under coupling field
Author(s):
SHEN Aiqin;  JIN Xinkuan;  GUO Yinchuan;  HE Ziming;  WANG Shengnan
(School of Highway, Changan University, Xian 710064, Shaanxi, China)
Keywords:
road engineering;  semirigid asphalt pavement;  finite element analysis;  temperature field;  moving load;  dynamic response
PACS:
U416.223
DOI:
10.19721/j.cnki.16718879.2022.05.001
Abstract:
Aiming at the serious problems such as cracks of semirigid asphalt pavement in Northern Shaanxi, the mechanical response of semirigid asphalt pavement under the actual temperature field, dynamic load and temperaturedynamic load coupling was analyzed. The finite element analysis software ABAQUS was used, and a threedimensional finite element model of a typical semirigid asphalt pavement structure based on measured parameters was established. The mechanical response law of the pavement structure under the actual temperature field, dynamic load and coupled field conditions was analyzed. The failure mechanism of the semirigid asphalt pavement in this area was further explored through onsite inspection, and the results were compared and verified with the finite element simulation results. The results show that under the action of the temperature field, the tensile stress of each structural layer of the pavement changes regularly with the temperature. The tensile stress of the lower layer of the pavement is the largest, and the tensile stress of the subbase layer is the smallest, the temperature difference in spring damages the pavement structure more seriously than winter. The maximum tensile stress of the surface layer is up to 1.488 MPa, and the pavement is easily cracked due to tension. Under the action of dynamic load, greater tensile stress, shear stress and tensile strain will be generated in the pavement structure layer. The tensile strain of the subbase layer can reach 30×10-6 to 40×10-6, which exceed 20×10-6larger than the tensile strain of the surface layer, so it is easy to generate reflection cracks from the bottom, and overloading will increase the mechanical response value of each pavement structure layer by up to 20%. Compared with the action of a single factor, the coupling field action will significantly increase the mechanical response value of each structural layer of the pavement, and the stress state of the pavement is more complex. The temperaturedynamic load coupling effect in spring is more unfavorable to the tensile stress and tensile strain index of the pavement structure, while the pavement structure has greater shear stress under the temperaturedynamic load coupling effect in winter. The field investigation and testing results are in good agreement with the finite element simulation results. The research results can provide a theoretical reference for the structural combination design, disease prevention and treatment of semirigid asphalt pavement in areas of the same kind. 4 tabs, 14 figs, 30 refs.

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Last Update: 2022-09-30