The bearing resistance provided by the geogrid's transverse ribs is a non-negligible aspect of the strength mechanism in mobilizing the geogrid–soil interface. Therefore, studying its influence on the response mechanism of geosynthetic-reinforced soil structures under cyclic loading is crucial. The stereoscopic geogrids were manufactured using 3D printing technology by quantitatively thickening the transverse ribs of planar geogrids. To investigate the cyclic hysteresis relationship and stress–dilatancy phase-transformation characteristics of the stereoscopic geogrid–coarse particle interface, cyclic direct shear tests were conducted. Additionally, a discrete element method (DEM) was employed to study the evolution of shear bands and fabric anisotropy at the interface under cyclic loading. The results of the study indicate that the stress–displacement phase angle of the stereoscopic geogrid in the horizontal direction of cyclic shear is smaller compared to the planar geogrid. Furthermore, thickening the transverse ribs decreases the stress–dilatancy phase-transformation angle of the interface. The thickness of the interface shear band in the stereoscopic geogrid is greater than that of the planar geogrid. Moreover, as the transverse-rib thickness increases, the principal direction of the average normal contact force and average tangential contact force under cyclic loading also increases.

土工格栅横肋提供的承载阻力是土工格栅-土壤界面强度机制中不可忽视的一个方面。因此，研究其对循环荷载作用下土工合成材料加筋土结构响应机制的影响至关重要。立体土工格栅是利用3D打印技术，通过定量加厚平面土工格栅的横肋来制造的。为了研究立体土工格栅-粗颗粒界面的循环滞后关系和应力-剪胀相变特性，进行了循环直剪试验。此外，采用离散元方法（DEM）来研究循环载荷下界面处剪切带和织物各向异性的演变。研究结果表明，立体土工格栅在循环剪切水平方向上的应力-位移相位角较平面土工格栅更小。此外，加厚横向肋会降低界面的应力-剪胀相变角。立体土工格栅中界面剪切带的厚度大于平面土工格栅的界面剪切带厚度。此外，随着横肋厚度的增加，循环载荷下平均法向接触力和平均切向接触力的主方向也随之增加。