The Hatch Mott MacDonald/Bechtel Joint Venture team is designer and construction manager for the 5.25-mile Tunnel Segment of the overall 16-mile Silicon Valley Rapid Transit Project, which extends the existing Bay Area Rapid Transit (BART) system southward from Fremont to San Jose. The Tunnel Segment includes twin bored tunnels, mined cross passages, and three deep station excavations situated in highly variable ground, high ground water table, and a dense urban setting with high-rise buildings adjacent to the largest excavation. This paper will discuss design challenges that have arisen with the excavations and the proposed solutions.
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