Has Metro considered building the subway with a larger single-bore tunnel rather than the twin-bore tunnels used on the Metro Red, Purple and Gold Lines to date?
Metro has enjoyed great success with the twin-bore tunnels used on the existing Metro system, particularly the recent tunnels on the Metro Gold Line Eastside Extension. These tunnels used the newest form of tunnel boring machine technology known as “earth pressure balance.” This technology maintains the pressure in the earth surrounding the tunnel. As a result, the tunnels for the Metro Gold Line Eastside Extension were constructed with no measurable surface subsidence and no substantiated property damage claims. They were also constructed on-time and on-budget. Metro is evaluating the best techniques for constructing the subway as well as other projects that may require tunneling. This includes looking at improvements to the twin-bore technology used on the Metro Gold Line Eastside Extension as well as the potential use of a large single-bore tunnel. Previous tunnels built by Metro have used twin tunnels that are approximately 20 feet in diameter. Each tunnel accommodates a single tra
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