Study on creep characteristics of geogrids considered sand-geosynthetics interaction under different loading levels

Abstract

Only considered creep behavior of geosynthetics in the design and construction of reinforced structures, not that the creep behavior of reinforced materials considered geosynthetics-sand interaction under different loading levels. A series of creep tests on a geogrid under different loading levels were carried out through a self-developed test device. The long-term creep characteristics of the geogrids under different loading levels were analyzed. The results showed that: Compared to sand constraint condition, under the same loading level, the creep rate under non-constraint condition is about 1.1 times. After the creep time over 400 h, the strain growth rate tends to be a constant value for sand constraint condition, which needs 700 h for non-constraint condition. Creep deformation mainly occurs near the pullout endpoint of the geogrid, and the deformation of each strain measurement zone is reduced from the tensile end to the fixed end of the geogrid.

Comparison between uniaxial and pull-out tests setup for polyester and HDPE geogrids

“…However, there are no clear guidelines for uniaxial and pull-out testing preparations regarding clamp lining material for various polymer resin types. Wilson et al [8] used sandpaper as clamp lining material for pull-out tests on polyethylene and polyester geogrids, while Wang et al [17] used a rubber bearing pad with polyethylene geogrids, and both recorded no problem with the lining material. Hatami et al [15] used sandpaper as a clamp lining material in uniaxial polypropylene and polyester geogrids tests.…”