A novel multi-span spring-based trapdoor apparatus has been developed to simulate more realistically the coupling of piles, soft soil, and geosynthetics, as well as the intricate interactions between adjacent soil arches under localized loading within geo-reinforced pile-supported (GRPS) embankments. By employing movable blocks with varying spring stiffnesses, this study advances the understanding of the coupling effect between piles, soft soil, and geosynthetics. Utilizing digital image correlation (DIC) technology, the research captures the dynamic evolution of soil arch shapes, providing new insights into stabilization mechanisms within GRPS embankments. It is found that lateral geosynthetics can effectively reduce the overall settlement of the embankment and mitigate the influence of trapdoor stiffness on the soil arch height. The geo-reinforcement enhances the stability of soil arches under localized loading by providing essential support to the arch feet of multiple internal soil arches. Four distinct stages in soil arch evolution under localized loading have been identified. The relationship between geo-reinforcement stiffness and trapdoor stiffness in affecting soil arching is complex and varies with different loading scenarios. The membrane effect plays a pivotal role in inter-span load transfer.

中文翻译：

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局部荷载作用下 GRPS 路堤土拱研究：多跨弹簧活板门模型试验


开发了一种新型多跨弹簧活板门装置，可以更真实地模拟桩、软土和土工合成材料的耦合，以及土工加固桩支撑 (GRPS) 内局部载荷作用下相邻土拱之间复杂的相互作用。 ) 堤坝。通过采用具有不同弹簧刚度的可移动块，本研究加深了对桩、软土和土工合成材料之间耦合效应的理解。该研究利用数字图像相关 (DIC) 技术捕捉土拱形状的动态演变，为 GRPS 路堤的稳定机制提供新的见解。研究发现，侧向土工合成材料可以有效减少路堤整体沉降，减轻活板刚度对土拱高度的影响。土工加固通过为多个内部土拱的拱脚提供必要的支撑，增强土拱在局部荷载下的稳定性。已经确定了局部荷载下土拱演化的四个不同阶段。土工加固刚度和活板门刚度在影响土拱方面的关系很复杂，并且随着不同的加载情况而变化。膜效应在跨间荷载传递中起着关键作用。