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Keller Springs Underpass Addison Airport Tunnel
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| Service: | Preliminary design using NATM
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| Location: | Dallas, TX United States |
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| Technical data: | Two lane road tunnel, 1650 ft total length, NATM construction under existing runways in mixed face conditions. |
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| Geology description: | Soil, weathered and unweathered Limestone (Austin Chalk). |
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