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• W3012518222 abstract "Uniform fine sands are recognized as problematic soils which are highly prone to earthquake or dynamic loads effects. Cyclic and dynamic loads on such soils can destroy its structure and cause them to experience high volume change. In loose sands, volume change originated from dynamic or cyclic loadings (caused by earthquake, machineries or other similar sources) can lead to excessive settlements on the ground surface which in turn endangers the structural integrity and performance of the superstructure. As a consequence, it is important to perform soil improvements prior to putting any foundation on them. Among many known and recently developed techniques, the soil compaction (or densification) and cement injection are the widest techniques in fine sands improvement. In this research, a numerical study is employed which incorporates the distinct elements method to investigate the volume change and settlement of uniform fine sands. The results obtained numerically have been compared with those observed in a laminar shear box physical model of samples of fine sand. A surface footing is placed over the top of the specimen in the shear box which is modeled by a small rigid plate. Comparisons indicate that the applied simulation technique is suitable for the soil under study. To simulate the model and for verification purpose, Anzali sand physical and mechanical properties have been implemented. Soil particles in the discrete elements technique were modeled by spherical particles obeying the Anzali sand grain size distribution, and for the surface footing, rigid clumps of particles were used. Experiments were performed for density indices of 30–88%, and numerical simulations by the discrete elements method were performed at porosities of 0.43–0.38. The trend of dynamic settlement over the cyclic loading shows a good agreement with measured data in the laboratory. Results revealed that the improvement techniques such as compaction and cementation have a significant effect on the reduction in the final settlement under applied dynamic loads." @default.
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• W3012518222 date "2020-03-18" @default.
• W3012518222 modified "2023-09-27" @default.
• W3012518222 title "Numerical analysis of ground improvement effects on dynamic settlement of uniform sand using DEM" @default.
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• W3012518222 doi "https://doi.org/10.1007/s42452-020-2502-0" @default.
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