M2 Developed three finite difference models associated with three different soil profiles and incorporated three different tunnel structure types that comprised a single bore, a twin-bore, and cut & cover options. The tunnel depth varied from 25 feet to 100 feet below the ground surface. The analysis was conducted using FLAC and non-linear soil loads versus displacement curves. Displacement curves were provided for varying depths below the ground surface. Normal and shear springs were provided for the tunnel in all three directions (upwards, lateral and downward movement). Soil load versus displacement curves were also provided for two large launching and receiving shaft structures about 30 feet deep. The load versus displacement values were provided for both normal and shear directions.

The project involved performing spectral matching in accordance with the CBC 2008 for the Bob Hope International Airport project in San Diego, California. Used the computer program RSPMATCH developed by Norm Abrahamson to perform the Spectra Matching for the seven sets of recorded fault normal and fault parallel components. We used a 5% damped DBE and MCE spectra as the target spectra for spectral matching. A total of 28 (7 earthquake records x 2 horizontal components x 2 target spectra) spectrally matched time histories were produced as part of our work. The results were summarized in a letter report. We also provided spectrally matched time histories and their 5% damped spectra in the digital form. Spectral matching was done in accordance with the CBC 2008 for the project. The report was reviewed by Dr. Marshal Lew and was accepted with minimal comments.