Numerical Analysis of Installation Damage of a Geogrid with Rectangular Apertures

Yan-li Dong, Jie Han


Geogrid has been widely used for construction of reinforced earth structures, such as roads, foundations, slopes, and walls. It may be damaged during the compaction process. Strength reduction due to installation damage should be considered in the design. The strength reduction factor is often determined by field trials, which are costly and time consuming. In this study, the numerical software-FLAC2D was adopted to investigate the responses of pre-damaged geogrids with rectangular apertures when subjected to a uniaxial tensile load at different directions relative to the orientations of ribs in air. To simulate the combined loss of rib and junction strengths, specimens were pre-damaged by reducing strength and stiffness of specific geogrid ribs by a certain percentage. The geogrid ribs were modeled using beam elements jointed rigidly at nodes and subjected to tension in one direction. The numerical study demonstrated that the pre-damaged geogrid with rectangular apertures had the same responses when it was subjected to tension at the loading directions. The pre-damaged geogrids under 30° tension were most sensitive to the damage. With the increase of the degree of damage, the tensile strengths decreased relative quickly. An increase of the degree of installation damage of ribs reduced the tensile strength/stiffness of the geogrid with rectangular apertures. A higher reduction factor (RFID) due to installation damage is suggested when the geogrid is subjected 30° tension relative to the orientation of ribs.


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