A model for strain increase of sand under cyclic shear in undrained condition

Abstract

In performance-based seismic design, the evaluation of the expected deformation is often requested. In these cases, it is necessary to appropriately estimate the strain increase in the ground from small strain to large strain. In this paper, based on the laboratory test results with various relative densities and fine contents, a practical strain increase mode is proposed. The proposed model is a bi-linear type with different strain increase rate before and after the occurrence of liquefaction. The parameters in the model can be determined from relative density and fines content. The proposed model is beneficial for the accuracy evaluation of the input parameters for numerical simulations.