Non-linear seismic response for liquefaction analysis: pore water pressure and strain ratio approach

Abstract

The liquefaction analysis in infrastructure projects is crucial as a preventive action for damage, especially in Indonesia, an earthquake-prone country. A wide range of liquefaction analyses is usually applied in Indonesia, such as non-linear analysis to generate the pore water pressure ratio (ru) to assess the potential of liquefaction. However, this approach does not fully present the complex behavior of layered soil in the soil-effective stress framework. The shear strain ratio is important for offering a comprehensive understanding of soil liquefaction analysis. This research aims to examine the combination of ru and shear strain ratio to assess liquefaction in layered ground. The DEEPSOIL program is used to generate the dynamic properties in each layer. The results show a strong correlation between the ru and strain ratio in each depth and borehole. However, they have diverse values in connection with the period of the ground motion approach. As a result, the evaluation and combining approach in the non-linear seismic response analysis of the three boreholes indicates a full liquefaction condition at a particular depth.