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Abstract

Based on the reconstruction project of Yangda Highway in Xizang, an important national project of the "the Belt and Road" initiative, this paper studied the frozen-thaw mechanical characteristics of culverts in plateau frozen soil regions. The mechanical models of steel corrugated pipe culverts and underwater antifreeze reinforced concrete pipe culverts in four working conditions were built by employing the Mi-das GTS NX finite element software. By setting the soil temperature change functions, this paper analyzed the internal force changes of soil layers, the internal force and displacement changes of pipe culverts and other structural layers, as well as the internal force changes of two-way HDPE high-density polyethylene geogrid before and after the frozen-thaw cycle for the pipe materials of culverts commonly utilized in the plateau regions. The results indicate that after experiencing the frozen-thaw cycle, the plastic zone of both types of pipe culverts increases, but employing underwater antifreeze reinforced concrete pipes has better coordinated deformation ability. After the frozen-thaw cycle, the main stress and shear stress change rates at the midpoint and both ends of the steel corrugated pipe culverts, as well as the displacement of different subgrade slope measurement points, are all smaller than those of the underwater antifreeze reinforced concrete pipe culverts, making them more suitable for the utilization in plateau cold regions. Additionally, laying the two-way HDPE high-density polyethylene geogrid can effectively reduce uneven deformation of pavement structural layers. Finally, the correctness of the method proposed in this paper was verified by comparing and analyzing the modeled theoretical calculated values with the detection data on the construction sites.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.038

First Page

240

Last Page

246

Submission Date

March 2025

Reference

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