State Route 72 SR 75/282 Transportation Corridor Project

M2C 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.