To examine the hydro-mechanical behavior of Geosynthetic Reinforced Soil Walls (GRSW) backfilled with locally available marginal lateritic soils, physical model tests were conducted during construction, surcharge loading, and rainfall infiltration. Various reinforcements were tested, including a conventional geogrid (GG) and two types of composite geosynthetic reinforcements (CGR) with equivalent stiffness but different configurations. The results showed that suction was maintained throughout surcharging, but during rainfall infiltration, the GG model lost suction after 12,240 min, while both CGRs retained it. Strain evaluations indicated that all reinforcements remained within serviceability limits during surcharging, but the GG model exceeded these limits during rainfall, while the CGRs stayed within acceptable limits with minimal strain increases. Additionally, the GG model showed a 61% increase in facing deformation during rainfall, exceeding serviceability limits, whereas the CGRs remained within permissible limits. The study emphasizes the importance of cautious use of marginal soils in backfill applications. These soils can still be suitable for GRSW when reinforced with composite geosynthetics, especially CGR made of polyester geogrids with non-woven geotextile bonded longitudinally to the polyester strips. This configuration demonstrated superior performance by reducing facing deformation through better drainage and improved soil-reinforcement interaction.

中文翻译：

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通过仪器化模型测试分析具有边缘红土回填土的复合土工合成材料增强土墙的水力行为


为了检查用当地可用的边缘红土回填的土工合成材料加固土墙 （GRSW） 的水力学行为，在施工、附加费加载和降雨渗透期间进行了物理模型测试。测试了各种加固材料，包括传统的土工格栅 （GG） 和两种类型的复合土工合成材料加固 （CGR），刚度相同但配置不同。结果表明，在整个增药过程中，吸力保持不变，但在降雨渗透过程中，GG 模型在 12 240 min 后失去了吸力，而两个 CGR 都保留了吸力。应变评估表明，在增药期间，所有加固都保持在正常使用限度内，但 GG 模型在降雨期间超过了这些限值，而 CGR 保持在可接受的限度内，应变增加最小。此外，GG 模型显示，在降雨期间，面变形增加了 61%，超过了适用性限制，而 CGR 保持在允许的范围内。该研究强调了在回填应用中谨慎使用边缘土壤的重要性。当用复合土工合成材料加固时，这些土壤仍然适用于GRSW，特别是由聚酯土工格栅制成的CGR，无纺土工布纵向粘合到聚酯条上。这种配置通过更好的排水和改进土壤-加固相互作用来减少表面变形，从而表现出卓越的性能。