PULLOUT TEST ON GEO-GRID REINFORCED SOIL

Abstract

Reinforced soil is used in the construction of embankments and retaining walls since past few years. This report focuses on the structural behavior of the geogrid under pull-out loading conditions. An experimental investigation was carried out considering the effect of length of the geogrid, effect of surcharge, effect of height of soil above geogrid and moisture content. Load displacement response was monitored during pull-out test and results are compared and analyzed. Experiment was carried out considering 15cm and 8cm height of soil over 35cm x 35cm and 35cm x 40cm size of geogrid with and without rigid plate on the top layer of the soil and it was observed that as the length of geogrid increases value of friction coefficient increases and when the height of soil over the geogrid increases value of friction coefficient decreases. It was also find out that if we use dry soil pull out strength of the soil will be less as compare to moist soil. When we use dry soil, some vertical deformation takes place before failure which can be directly observed and the failure takes place sudden, not continuous as in moist soil. With increase in height of soil and length of geogrid pull-out strength of the soil increases and value of coefficient is less than one in all the cases.