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Field Test and Numerical Analysis on Geogrid-Reinforced Slope with High Embankment on Top
Geosynthetic-reinforced soil structure with wrap-around facing has been widely used in civil infrastructures due to its light weight, low cost, and better foundation adaptability. This paper evaluates the performance (including vertical earth pressure, and strain of reinforcement) of a 14-m high geogrid-reinforced slope (0.5-m layer spacing) with an 8-m high embankment as surcharge loading through a numerical model using the fast Lagrangian analysis of continua (FLAC) 3D. The results of the numerical model were then compared with data monitored from a field site (in the same structure) for validation. It was found that the vertical earth pressure increases with the increase of backfill height. The increase amplitude decreases obviously when filling the embankment, indicating that the influence of the upper embankment on the lower reinforced slope is limited. Peak tensile strain of geogrid occurs along the reinforcement layer. The measured and simulated maximum strains are 1.28 % and 0.12%, respectively, which are less than the maximum tensile strain of the geogrid (i.e., 9.5%). Therefore, the geogrid is unlikely to be snapped. The trend of potential slip surface in the field test is consistent with that of the numerical model. However, the potential slip surface of the numerical model moves toward the inner side of the reinforced body, which indicates the slope is in a safe state.
Field Test and Numerical Analysis on Geogrid-Reinforced Slope with High Embankment on Top
Geosynthetic-reinforced soil structure with wrap-around facing has been widely used in civil infrastructures due to its light weight, low cost, and better foundation adaptability. This paper evaluates the performance (including vertical earth pressure, and strain of reinforcement) of a 14-m high geogrid-reinforced slope (0.5-m layer spacing) with an 8-m high embankment as surcharge loading through a numerical model using the fast Lagrangian analysis of continua (FLAC) 3D. The results of the numerical model were then compared with data monitored from a field site (in the same structure) for validation. It was found that the vertical earth pressure increases with the increase of backfill height. The increase amplitude decreases obviously when filling the embankment, indicating that the influence of the upper embankment on the lower reinforced slope is limited. Peak tensile strain of geogrid occurs along the reinforcement layer. The measured and simulated maximum strains are 1.28 % and 0.12%, respectively, which are less than the maximum tensile strain of the geogrid (i.e., 9.5%). Therefore, the geogrid is unlikely to be snapped. The trend of potential slip surface in the field test is consistent with that of the numerical model. However, the potential slip surface of the numerical model moves toward the inner side of the reinforced body, which indicates the slope is in a safe state.
Field Test and Numerical Analysis on Geogrid-Reinforced Slope with High Embankment on Top
Xu, Hua (Autor:in) / Ren, Xin (Autor:in) / Chen, Jian-Nan (Autor:in) / Xia, Lei (Autor:in) / Chen, Zi-Yun (Autor:in)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 165-174
21.03.2019
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Field Test and Numerical Analysis on Geogrid-Reinforced Slope with High Embankment on Top
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