An analytical solution is proposed to identify the performance of unreinforced and geogrid-reinforcement pile-supported embankments under localized surface loading at working stress conditions based on the total efficacy and efficacy induced by soil arching alone, average strain of geogrid reinforcement, and average settlement of subsoil. This solution considered interactively soil arching within the embankment fill, the load-deflection behavior of geogrid reinforcement (if existed), and subsoil settlement. Specifically, the soil arching consisted of a structural arch with different stress states (evaluated by the elastoplastic state coefficient K) and a frictional arch. The load-deflection behavior of geogrid reinforcement was modeled by a membrane, with due consideration of the skin friction between the geogrid and soil. The subsoil was idealized as a one-dimensional compression model. The effectiveness of the proposed solution was verified by comparisons with results from the collected literature. It is shown that geogrid reinforcement improved the performance of embankments with low subsoil stiffness significantly more than that of those with high stiffness subsoil. A high tensile stiffness geogrid was found to be inefficient because its contribution to reducing the subsoil settlement and enhancing the load transfer efficacy was minimal. This paper provides a significant reference for optimizing these embankment design.

中文翻译：

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局部地表荷载作用下未加固和土工格栅加固桩支护路堤的性能：分析研究


提出了一种解析解决方案，根据总功效和单独土体拱起引起的功效、土工格栅加固的平均应变和底土平均沉降，确定未加固和土工格栅加固桩支撑路堤在工作应力条件下局部地表载荷下的性能。该解决方案考虑了路堤填土内的交互式土壤拱起、土工格栅加固的载荷挠度行为（如果存在）和底土沉降。具体来说，土拱由具有不同应力状态的结构拱（通过弹塑性状态系数 K 评估）和摩擦拱组成。土工格栅加固的荷载-挠度行为由膜建模，并适当考虑了土工格栅与土壤之间的表皮摩擦。底土被理想化为一维压缩模型。通过与收集的文献结果进行比较，验证了所提出解决方案的有效性。结果表明，土工格栅加固对低底土刚度路堤性能的改善明显大于高刚度底土的路堤。研究发现，高抗拉刚度土工格栅效率低下，因为它对减少底土沉降和提高荷载传递效率的贡献很小。本文为优化这些路堤设计提供了重要的参考。