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Deterministic and Probabilistic Analysis of the Effect of Tunnel Location on Slope Stability – Application to the Eisenhower-Johnson Memorial Tunnel
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2022-10-31
[PDF-3.65 MB]
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Abstract:Subsurface characterization in mountainous terrain is complex, requiring extensive analysis to optimize tunnel alignment based on rock quality, support systems, and groundwater flow. However, slope stability is often underexamined, especially for tunnels aligned parallel to slope faces. This is due to the rapidly changing terrain geometry, which increases the cost of detailed 3D modeling, leading to reliance on 2D simulations. This study uses the Eisenhower-Johnson Memorial Tunnel (EJMT) in Colorado to determine the minimum distance from the slope face at which slope stability is unaffected. Results from 600 simulations show stability improves as tunnels move deeper, with interaction minimized beyond 5.5 tunnel diameters. The study also includes access road considerations and a 3D analysis for perpendicular alignments.
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