Study on applicability of effective stress analysis considering large-strain liquefaction characteristics of sandy soils

Abstract

The behavior of large strain region during liquefaction was analyzed by focusing on the relationship between the normalized cumulative dissipated energy ΣΔW/σ’_c and φ/φ_f, which is the internal friction angle φ at each loading stage divided by the peak internal friction angleφ_f. The results showed that φ/φ_f tends to decrease after ΣΔW/σ’_c peaks, and this trend depended on the relative density. The tendency of φ/φ_f to decrease was formulated, and a one-element simulation was performed using an effective stress analysis method based on finite deformation theory that incorporates the formulated relationship. As a result, the improved effective stress analysis method was able to simulate the behavior up to the large strain region with a certain degree of accuracy. However, the simulation using the specimen model caused divergence in the middle of the analysis. We plan to improve the method, including stability improvements.