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Abstract

Based on the design of the pile-slab structures in highway reconstruction and expansion projects, this paper built a finite element numerical simulation model, which includes multiple parts such as pile-slab structures, cast-in-place sections, transverse slabs, old subgrade, and soil. Meanwhile, it adopted Ansys surface-surface contact to simulate the overlap between the new structure and the old subgrade. By conducting finite element simulation, this paper systematically studied the changes in contact normal stress, friction normal stress, and deformation between the contact surfaces of pile-slab structures in different working conditions for single, double, and four vehicles. The results show that under the arrangement of four vehicles, the normal stress and friction stress of the structural contact surface are both the highest, and in the working condition of 23 (constant load+distance of 6.05 m between the outermost wheel and the cantilever end of the bearing plate), the globally most unfavorable stress situation occurs. At this time, the maximum contact normal stress is 302.936 kPa and the maximum contact friction stress is 90.881 kPa. Additionally, in the working condition of 24, the maximum horizontal gaps between the side of the cast-in-place section and the old subgrade, and between the bottom of the cast-in-place section and the soil are 0.731 mm, with the maximum vertical gap of 0.043 mm. The most unfavorable situation for the horizontalgap of the transverse slab is in the working condition of 25, with a gap of 0.273 mm. The most unfavorable situation for the vertical gap of the transverse slab is in the working condition of 7, with a gap of 0.203 mm.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.007

First Page

37

Last Page

43

Submission Date

March 2025

Reference

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