Abstract
An analytical method to accurately predict the large deformation due to liquefaction is required, especially for the design considering a large earthquake. Therefore, as a basic study of large strain liquefaction behavior for numerical analysis, elemental simulations were carried out based on the results of large strain liquefaction tests for Toyoura sand up to γsa = 60%. The results showed that the normal ϕf could not reproduce the test results. However, by using ϕf after reduction by cyclic shear stress loading, the results of large strain liquefaction tests up to γsa = 60% could be generally reproduced. In order to further verify the applicability of using the reduced ϕf, a two-dimensional large-deformation analysis was conducted to reproduce the centrifuge model test that obtained large deformation. As a result, compared with the results using the normal ϕf, the results using the reduced ϕf were closer to the experimental results. Future work includes setting up a method to evaluate the continuous reduction of ϕf due to cyclic shear stress, including after reaching the limiting shear strain γL, confirming the rate of reduction of ϕf in materials other than Toyoura sand, and applying the method to two-dimensional analysis.
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Fujii, N., Kiyota, T., Umar, M., Ueda, K. (2022). A Study on Liquefaction Characteristics of Sandy Soil in Large Strain Levels to Improve the Accuracy of Large Deformation Analysis. In: Wang, L., Zhang, JM., Wang, R. (eds) Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022). PBD-IV 2022. Geotechnical, Geological and Earthquake Engineering, vol 52. Springer, Cham. https://doi.org/10.1007/978-3-031-11898-2_131
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DOI: https://doi.org/10.1007/978-3-031-11898-2_131
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