Abstract
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.
Highlights
Geosynthetic-reinforced soil (GRS) structures are widely constructed on account of their economic advantages, successful performance, and environmentally friendly
A series of unconfined tensile strength tests and pullout tests have been conducted to evaluate the mechanical and interface behavior of triaxial geogrid used for GRS structures
By using the inextensible and smooth steel wires, these laboratory experiments has provide an effective method to investigate the deformation and complex interlocking between the triaxial geogrid and compacted sand under different normal stresses. e main conclusions obtained are summarized as follows: (1) e triaxial geogrid has been shown to provide nearly uniform tensile strength in all loading directions as compared with the biaxial geogrid. is advantage can contribute to the usage of triaxial geogrid in the GRS structures of which the unanticipated failure is possible in random directions
Summary
Geosynthetic-reinforced soil (GRS) structures are widely constructed on account of their economic advantages, successful performance, and environmentally friendly. It is worth noting that the performance of GRS structures is largely governed by the interface behavior between the geosynthetics and the backfill soil [1, 2]. E interaction developed along the soil-geosynthetic interface is very complex due to the effect of the physical and mechanical properties of the soil and geosynthetics, as well as the loading conditions [3]. As for biaxial geogrids, if subjected to tension in different direction apart from the longitudinal and transverse direction, especially in the 45° loading direction, large reduction of tensile strength should be taken into account. Considering the limitation of uniaxial and biaxial geogrids, a recently introduced geogrid
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