In recent years, the use of construction and demolition (C&D) materials as alternative aggregates in geotechnical engineering applications, such as embankments, pavement subbase layers and geosynthetic-reinforced structures has raised increasing attention from researchers and practitioners worldwide. On the other hand, geosynthetics, particularly geogrids and high strength geotextiles, are used as a reinforcement material in some of those applications. When these infrastructures are subjected to repeated loadings (e.g. traffic, wave and seismic loads), the understanding of the interaction properties at the backfill-geosynthetic interfaces under cyclic loading conditions is of primary interest. This paper describes an experimental study carried out using a large-scale pullout test apparatus to assess the load-strain-displacement behaviour of two geosynthetics embedded in a recycled C&D material under cyclic and post-cyclic loading conditions. Test results show that cyclic loading can measurably reduce the post-cyclic pullout resistance of the geotextile (up to 15%), when compared to that obtained from the benchmark monotonic test. Conversely, the cyclic loading did not significantly influence the pullout resistance of the geogrid. The cumulative cyclic displacements over the length of the geosynthetics were found to increase with the load amplitude and the pre-cyclic pullout load level. Moreover, under identical test conditions, the accumulated cyclic deformations along the geotextile length consistently exceeded those for the geogrid, possibly due to the lower tensile stiffness of the geotextile at low strains.

近年来，在土工工程应用（例如路堤，人行道基础层和土工合成材料增强的结构）中将建筑和拆除（C＆D）材料用作替代集料的做法已引起全球研究人员和从业人员的越来越多的关注。另一方面，土工合成材料，特别是土工格栅和高强度土工织物，在其中一些应用中用作增强材料。当这些基础设施承受反复荷载（例如交通，波浪和地震荷载）时，对循环荷载条件下回填土工合成材料界面处的相互作用特性的理解是最重要的。本文介绍了使用大型拉拔测试仪进行的一项实验研究，以评估循环和后循环加载条件下嵌入再生C＆D材料中的两种土工合成材料的载荷-应变-位移行为。试验结果表明，与基准单调试验相比，循环载荷可显着降低土工织物的循环后抗拔强度（最高15％）。相反，循环载荷并没有显着影响土工格栅的抗拔力。人们发现，在土工合成材料的整个长度上，累积的循环位移会随着载荷振幅和循环前拔出载荷水平的增加而增加。而且，在相同的测试条件下，