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<p>This study performed the scaled model tests to evaluate the mechanical behavior of retaining walls with recycled asphalt pavement (RAP) as backfill, both with and without geogrid reinforcement, under static loads. Results showed that reinforcement significantly reduced horizontal displacement, with an average reduction of 66.3% across various loads and wall heights. Geogrid-reinforced RAP reduced vertical and horizontal earth pressures by up to 41.2% and 39.2%, respectively, compared to unreinforced RAP. Geogrid strain exhibited a single peak pattern, with maximum strain at 0.25&#xa0;m from the wall, approximately 40% of the wall height, indicating a shearing action near the failure surface. The vertical settlement of RAP backfill increased rapidly within 200&#xa0;min and stabilized over time, with a 25.2% maximum reduction in settlement achieved through geogrid reinforcement. This study confirmed the effectiveness of geogrid in mitigating creep deformation of RAP backfill, as evidenced by the lower vertical and horizontal earth pressures compared to theoretical predictions. The findings underscore the feasibility of using geogrid-reinforced RAP in retaining wall applications to improve stability and minimize deformation under sustained loads.</p>

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Model Test on Geogrid-Reinforced Retaining Wall with Recycled Asphalt Pavement as Backfill Under Static Load

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Zhenyan Feng,
  • Zhaoer Zhang,
  • Kaixuan Liu,
  • Jie Yin

摘要

This study performed the scaled model tests to evaluate the mechanical behavior of retaining walls with recycled asphalt pavement (RAP) as backfill, both with and without geogrid reinforcement, under static loads. Results showed that reinforcement significantly reduced horizontal displacement, with an average reduction of 66.3% across various loads and wall heights. Geogrid-reinforced RAP reduced vertical and horizontal earth pressures by up to 41.2% and 39.2%, respectively, compared to unreinforced RAP. Geogrid strain exhibited a single peak pattern, with maximum strain at 0.25 m from the wall, approximately 40% of the wall height, indicating a shearing action near the failure surface. The vertical settlement of RAP backfill increased rapidly within 200 min and stabilized over time, with a 25.2% maximum reduction in settlement achieved through geogrid reinforcement. This study confirmed the effectiveness of geogrid in mitigating creep deformation of RAP backfill, as evidenced by the lower vertical and horizontal earth pressures compared to theoretical predictions. The findings underscore the feasibility of using geogrid-reinforced RAP in retaining wall applications to improve stability and minimize deformation under sustained loads.