This paper provides a more realistic representation of the soil-geogrid interface in indirectly activated geogrids. A new testing apparatus is designed using transparent soil that allows an unobstructed observation of the interface to investigate the interaction occurring along the reinforcement. In this investigation, the reinforcement is indirectly activated by the deformations of the surrounding soil. Deformations were determined by digital image correlation (DIC) using a dot pattern attached to the geogrid and a laser speckle plane within the transparent soil. The interaction is derived from relative soil-geogrid displacements, deflections of geogrid transverse members, geogrid strain and force distributions as well as shear stresses acting at the interface. Three zones were identified corresponding to the distinct modes of interaction: pushout, pullout and interlocking, whereby a micro-mechanical conceptual model was validated. The geogrid force reaches its maximum at the intersection of the critical slip plane with the reinforcement. The results indicate that the pushout, pullout and interlocking areas cover 15%, 49% and 36% of the total geogrid length respectively. In this study, a transition area between the pushout and pullout zones was observed where the mobilised interface shear stress increases to a maximum value.

本文提供了间接激活土工格栅中土壤 - 土工格栅界面的更真实的表示。使用透明土壤设计了一种新的测试设备，可以无障碍地观察界面，以研究沿钢筋发生的相互作用。在这项调查中，加固是由周围土壤的变形间接激活的。变形是通过数字图像相关 (DIC) 确定的，使用连接到土工格栅的点图案和透明土壤内的激光散斑平面。相互作用源自相对的土工格栅位移、土工格栅横向构件的挠度、土工格栅应变和力分布以及作用在界面上的剪应力。根据不同的交互模式确定了三个区域：推出、拉出和互锁，从而验证了微机械概念模型。土工格栅力在临界滑移面与钢筋的交点处达到最大值。结果表明，顶出、拉出和互锁区域分别占土工格栅总长度的15%、49%和36%。在这项研究中，观察到了推出区和拉出区之间的过渡区域，其中移动的界面剪应力增加到最大值。