Abstract
This chapter presents numerical simulation by using FLIP ROSE (Iai et al, Soils Found 32(2):1–15, 1992). FLIP ROSE is one of effective stress analysis used widely in Japan. It is commonly used to verify the seismic performance in practical design of port structures such as caisson-type quay walls and sheet pile quay walls. By using this program, we conducted the numerical simulation exercise for some cases.
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1 Introduction
LEAP (Liquefaction Experiments and Analysis Project) is an international joint research project to discuss the modeling of the centrifuge test and numerical modeling of liquefaction.
Summary of centrifuge experiments is listed in Tables 18.1 and 18.2. In this chapter, numerical simulation of phase II was performed for “KyU_A_2_1”, “RPI_A_A1_1,” “UCD_A_A2_1,” “KyU_A_B2_1,” and “RPI_A_B1_1” (Fig. 18.1).
2 Constitutive Model of Soils
We conducted element test simulation and 2D analysis for the numerical simulation exercises. The 2D analysis was performed by using FLIP ROSE Ver7.4.2. In this program, a strain space multiple mechanism model (Iai et al., 1992, 2011) is used.
The model in FLIP ROSE is based on the multiple mechanism model (Towhata & Ishihara, 1985). In this model, the stress-strain relationship in each arbitrary shear direction was modeled as a hyperbolic relationship. The cocktail glass model is the most advanced model for liquefaction in FLIP ROSE. In this model, the dilatancy model is given as the sum of contractive part and dilative part.
3 Detailed Specification of Numerical Simulation (FE Analysis)
3.1 Phase I of Numerical Simulation
We conducted the simulation exercise to calibrate constitutive models using the results of torsional shear tests (for Dr = 50% and 60% under 100 kPa) Tables 18.3 and 18.4 list the parameters of the strain space multiple mechanism model. The most of parameters were set by various tests. The parameters for dilatancy were decided by trial-and-error. Figure 18.2, 18.3, 18.4, 18.5, 18.6 and 18.7 show the results of the simulation of torsional shear tests.
4 Conclusions
This chapter presents LEAP-ASIA-2018 Type-B Simulations. In this chapter, we conducted effective stress analysis by using FLIP ROSE.
References
Iai, S., Matsunaga, Y., & Kameoka, T. (1992). Strain space plasticity model for cyclic mobility. Soils and Foundations, 32(2), 1–15.
Iai, S., Tobita, T., Ozutsumi, O., & Ueda, K. (2011). Dilatancy of granular materials in a strain space multiple mechanism model. International Journal for Numerical and Analytical Methods in Geomechanics, 35(3), 360–392.
Towhata, I., & Ishihara, K., (1985) Modelling soil behavior under principal stress axes rotation. Proceedings of the 5th international conference on numerical methods in geomechanics, Vol. 1, pp. 523–530.
Acknowledgments
This report was prepared with volunteer works of the WG members of FLIP consortium.
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Hyodo, J., Ichii, K. (2024). LEAP-ASIA-2019 Type-B Simulations Through FLIP. In: Tobita, T., Ichii, K., Ueda, K. (eds) Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading II. LEAP 2019. Springer, Cham. https://doi.org/10.1007/978-3-031-48821-4_18
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DOI: https://doi.org/10.1007/978-3-031-48821-4_18
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