In this study, Recycled Concrete Aggregate (RCA) was employed as a sandwich technique around the geogrid to enhance the pullout resistance of the geogrid in clayey backfills. Large-scale pullout tests were conducted on three configurations: geogrid-reinforced clay, geogrid-reinforced RCA, and geogrid sandwiched between layers of RCA, aimed at investigating pullout resistance and deformation. The experiments encompassed two different geogrid types (designated as G1 and G2), varying normal pressures ranging from 10 to 50 kPa, and RCA layers with thicknesses of 40, 80, 160, and 320 mm. Results from the experiments revealed that the inclusion of RCA layers around the geogrid substantially enhanced pullout resistance, with improvements ranging from 1.5 to 3 times compared to clay specimens. Optimal RCA thicknesses were determined in order to enhance soil-geogrid bonding and pullout resistance. For G1 geogrid, a thickness of 160 mm (equivalent to replacing 25% of clay volume with RCA) was identified as optimal, while for G2 geogrid, an 80 mm thickness (equivalent to replacing 15% of clay volume with RCA) was found to be sufficient. These thicknesses were established to achieve over 80% of the pullout force compared to full RCA specimens.

中文翻译：

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改善粘土与土工格栅的相互作用：通过再生混凝土骨料封装增强抗拉拔性


在这项研究中，再生混凝土骨料（RCA）被用作土工格栅周围的夹层技术，以增强粘土回填土中土工格栅的抗拔性。对三种配置进行了大规模拉拔试验：土工格栅加筋粘土、土工格栅加筋 RCA 和夹在 RCA 层之间的土工格栅，旨在研究拉拔阻力和变形。实验包括两种不同的土工格栅类型（指定为 G1 和 G2）、10 至 50 kPa 的不同法向压力以及厚度为 40、80、160 和 320 mm 的 RCA 层。实验结果表明，土工格栅周围包含 RCA 层可显着增强抗拉拔性，与粘土样本相比，提高幅度为 1.5 至 3 倍。确定最佳 RCA 厚度是为了增强土壤与土工格栅的粘合力和抗拉拔性。对于 G1 土工格栅，160 毫米的厚度（相当于用 RCA 替代 25% 的粘土体积）被认为是最佳厚度，而对于 G2 土工格栅，80 毫米的厚度（相当于用 RCA 替代 15% 的粘土体积）被认为是最佳厚度。足够了。与全 RCA 样本相比，这些厚度的设定是为了实现超过 80% 的拉拔力。