Based on experimental research on long-term performances of geosynthetics-reinforced earth retailing walls, comprehensive study of strains of geogrid, lateral deformation of panel and earth pressure at the stages of filling, loading and continuing measurement is carried out, and scale effect of model chamber on geogrid's strain is analyzed. The tests results show that the strains of geogrid increase with time and then have a tendency to become stable after enduring 6 months. As distance from panel increases, the strains of geogrid increase firstly following by decrease slowly; and then geogrid's strains in cohesive soil develop and increase along the length of geogrid with time changing. Besides, due to the effect of chamber-soil friction and small gap between loading plate and chamber, the measured values of strain for middle rib are larger generally than strain values for lateral rib. Finally, horizontal earth pressure behind retaining wall is twice as large as earth pressure calculated by method of Rankine; and the maximum value of vertical earth pressure only account for 1/3 of the summarization value considered load and dead-weight of soil, which showed the geogrid used for reinforcement will significantly induce the redistribution of stresses in backfill.
