Effect of centrifugal spinning process and re-shaking on soil density changes in liquefiable small scale physical models

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4. Effect of centrifugal spinning process and re-shaking on soil density changes in liquefiable small scale physical models

 In the geotechnical centrifuge tests, the stress field increases during the spin-up processes up to a target acceleration. This causes settlement and changes the density of the ground model before the main test at the target acceleration. Since usually, the model ground should reach a predefined density, the initial void ratio should be adjusted to get the target density after touching the final centrifugal acceleration. Therefore, the models should be prepared with less density in 1g, so that, the initial density of the physical model after spin-up should reach the desirable density. In the investigation of geotechnical phenomena, such as soil liquefaction, where soil density has a great effect on the results, the importance of this issue becomes more necessary. In this study, a series of dynamic centrifuge tests were performed on the Firouzkooh sand in a laminar box to investigate post-liquefaction effects on loose sand. In this research, the soil with the initial void ratio =0.93 in 1g was prepared in layers and was spun up to centrifugal acceleration of 40g hence the final value of the void ratio reached e=0.82 as planned. It was found that the greater initial void ratio of the soil, the more settlement the soil will experience during the saturation and spin up process and the settlement caused by spin-up constitutes a large amount of model settlement compared to the main dynamic loading. For investigating the effects of re-shaking, the process was performed again. In the second stage, settlement due to spin up and dynamic loading decreased 68% and 44% sequentially.

4th Asia-Pacific Conference on Physical Modelling in Geotechnics (ACPMG2024)

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