As the California High Speed Rail Authority executes multiple contracts for California’s $62.1-billion high-speed-rail line, crews are making headway on the initial 100 miles of track. The efforts comprise a scaled-back initial plan of operation, between San Jose and north of Bakersfield, which could begin carrying passengers by 2025.
Construction commenced last summer on the $985-million Package 1 to build 29 miles of track in Madera and Fresno counties. After about two years of preconstruction, design-build joint venture Tutor Perini/Zachry/Parsons (TPZP) began work on the Fresno River Viaduct in June. The structure is just one of 52 overpasses to be built in the rail line’s first three construction packages.
Because it can moderate the damaging effects of earthquakes, base-isolation is a technique used primarily in seismically active regions. ENR takes a look at some of the largest applications of base-isolation technologies in the world.