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Describe the proposed methodology for the site-specific seismic hazard analysis and soil-structure interaction modeling.

The approach utilizes a combination of 1D equivalent linear site response analysis and 3D finite element modeling to evaluate ground motion amplification. We will integrate borehole data with shear wave velocity profiles to calibrate the soil models, ensuring the interaction between the foundation and the geotechnical strata is captured under peak ground acceleration scenarios.

What specialized laboratory testing will be conducted to determine the shear strength of the unsaturated cohesive soils?

The research will employ advanced triaxial testing with suction control to establish the critical state line for the specific clay samples. This includes consolidated-undrained tests to simulate rapid loading conditions typical of the proposed infrastructure project.

Provide a detailed timeline for the field investigation phase, including borehole spacing and sampling frequency.

The field investigation is scheduled for a 4-week duration. We will implement a grid-based sampling strategy with boreholes spaced every 50 meters, though specific depths for the deep-seated strata are still being finalized based on the preliminary geological map.