Decades of research has been dedicated to investigating inverted pavement as an alternative to traditional flexible pavement structures. While previous studies have largely focused on the stress dependency of the unbound aggregate base (UAB) layer using numerical simulations, there is limited research on the construction and use of geogrid reinforcement in inverted pavement. This study presents a comprehensive evaluation of full-scale inverted pavements, specifically assessing the impact of geogrid reinforcement on rutting performance. The results indicate that adding geogrid to the UAB layer improves rutting resistance, with optimal results achieved when the geogrid is placed in the upper third of the layer. On the other hand, when the geogrid was positioned in the bottom two-thirds of the layer, it led to inferior rutting performance compared to the inverted pavement where geogrid reinforcement was placed in the upper one-third of the UAB layer. Numerical simulations validate the field test results, demonstrating that higher tensile strains in the upper third location enhance aggregate interlocking and stiffness due to the geogrid's enhanced constraining capacity and reinforcement. Conversely, lower tensile strains in the bottom two-thirds location limit geogrid constraints, leading to increased rutting and surface deformation.

中文翻译：

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土工格栅加筋倒装路面全面加速试验

数十年的研究致力于研究倒置路面作为传统柔性路面结构的替代方案。虽然以前的研究主要集中在使用数值模拟的无粘结骨料基层（UAB）的应力依赖性，但对倒置路面中土工格栅加固的施工和使用的研究有限。本研究对全尺寸倒置路面进行了综合评估，特别评估了土工格栅加固对车辙性能的影响。结果表明，在 UAB 层中添加土工格栅可提高抗车辙性能，当土工格栅放置在该层的上三分之一时，可获得最佳效果。另一方面，当土工格栅位于该层底部三分之二时，与土工格栅加固位于 UAB 层上部三分之一的倒置路面相比，其车辙性能较差。数值模拟验证了现场测试结果，表明由于土工格栅增强的约束能力和加固作用，上部第三位置的较高拉伸应变增强了骨料互锁和刚度。相反，底部三分之二位置的较低拉伸应变限制了土工格栅的约束，导致车辙和表面变形增加。