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Influence of Long-Term Stiffness of Geogrids on the Reinforcement Load of Reinforced Soil Retaining Walls
Accelerated creep and stress relaxation laboratory tests based on the time-temperature superposition method were carried out on one type of polypropylene (PP) geogrids. The stresses or strains in the tests were maintained at low levels to simulate in-service conditions. The relationships between the long-term stiffness and logarithmic time at different stress or strain levels were obtained. Both the long-term creep stiffness formula and stress relaxation stiffness formula were derived from the test results. By establishing numerical models of geosynthetic-reinforced-soil (GRS) retaining walls with the aforementioned long-term stiffness formulas, the influence of long-term stiffness on the reinforcement load and lateral facing displacement was analyzed by the iterative method. Numerical simulation results showed that the overall reinforcement load decreased with the reduction of long-term reinforcement stiffness, and the lateral facing displacement increased with a decrease in the long-term stiffness. It was found that the creep and stress relaxation responses co-existed and interacted with each other during the normal service life of the retaining walls, and the actual reinforcement load was between the result obtained using only the creep or stress relaxation stiffness, but their differences were not significant. The iterative method proposed in this study could be employed to analyze the long-term reinforcement load of GRS retaining walls.
Influence of Long-Term Stiffness of Geogrids on the Reinforcement Load of Reinforced Soil Retaining Walls
Accelerated creep and stress relaxation laboratory tests based on the time-temperature superposition method were carried out on one type of polypropylene (PP) geogrids. The stresses or strains in the tests were maintained at low levels to simulate in-service conditions. The relationships between the long-term stiffness and logarithmic time at different stress or strain levels were obtained. Both the long-term creep stiffness formula and stress relaxation stiffness formula were derived from the test results. By establishing numerical models of geosynthetic-reinforced-soil (GRS) retaining walls with the aforementioned long-term stiffness formulas, the influence of long-term stiffness on the reinforcement load and lateral facing displacement was analyzed by the iterative method. Numerical simulation results showed that the overall reinforcement load decreased with the reduction of long-term reinforcement stiffness, and the lateral facing displacement increased with a decrease in the long-term stiffness. It was found that the creep and stress relaxation responses co-existed and interacted with each other during the normal service life of the retaining walls, and the actual reinforcement load was between the result obtained using only the creep or stress relaxation stiffness, but their differences were not significant. The iterative method proposed in this study could be employed to analyze the long-term reinforcement load of GRS retaining walls.
Influence of Long-Term Stiffness of Geogrids on the Reinforcement Load of Reinforced Soil Retaining Walls
Fan, Cheng (author) / Xiang, Qianyong (author) / Liu, Huabei (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 354-363
2019-03-21
Conference paper
Electronic Resource
English
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