Geosynthetics-reinforced soil (GRS) structures have been widely used for the prevention of geological hazards. As a recently introduced product, the triaxial geogrid has been confirmed to provide improved performance due to the more stable grid structure. This paper presents an evaluation of the mechanical behavior based on a series of laboratory tests. The unconfined tensile strength of biaxial geogrid and triaxial geogrid in different loading directions relative to the orientation of ribs was investigated. Then, more than 8 pullout tests were conducted on the triaxial geogrid specimens embedded in the compacted sand. The internal displacements along the geogrid length were monitored. The results show that the triaxial geogrid has been shown to provide nearly uniform tensile strength in all loading directions as compared with the biaxial geogrid. The triaxial geogrid deformation is mainly characterized by rib bending and nodal distortion along with an inward squeeze perpendicular to the pullout direction. The interface friction between the soil and the geogrid develops in a progressive mode, and an elasto-plastic-softening characteristic is detected experimentally due to the extensibility of geogrid.

中文翻译：

---

加筋土结构用三轴土工格栅的力学性能

土工合成材料加固的土壤（GRS）结构已被广泛用于预防地质灾害。作为最新推出的产品，三轴土工格栅由于具有更稳定的格栅结构而被证实具有改进的性能。本文基于一系列实验室测试对机械性能进行了评估。研究了双轴土工格栅和三轴土工格栅在不同荷载方向上相对于肋骨方向的无侧限抗拉强度。然后，对嵌在压实砂土中的三轴土工格栅样品进行了8次以上的拉拔试验。监测沿土工格栅长度的内部位移。结果表明，与双轴土工格栅相比，三轴土工格栅已显示在所有载荷方向上均提供几乎均匀的拉伸强度。三轴土工格栅变形的主要特征是肋弯曲和节点变形以及垂直于拉出方向的向内挤压。土壤与土工格栅之间的界面摩擦以渐进方式发展，并且由于土工格栅的可扩展性，实验检测到了弹塑性软化特性。