Alternative Title

Paper No. 1.27

Location

St. Louis, Missouri

Session Start Date

3-8-1998

Session End Date

3-15-1998

Abstract

Benaroya Hall, the new home of the Seattle Symphony, is located directly over an old railroad tunnel in downtown Seattle. The railroad tunnel was hand excavated in the early 1900s; the tunnel excavation caused considerable settlement of the buildings and streets above. The tunneling disturbance and subsequent rotting of timber supports resulted in numerous voids in the vicinity of the tunnel. Excavation for the Benaroya Hall removed up to 55 feet of soil overburden and came to within 12 feet of the tunnel crown. The foundations for the symphony hall were required to protect the railroad tunnel from carrying symphony hall building loads as well as preventing the hall from settling because of tunnel void collapse. A combination of drilled shafts and a foundation mat was used to support the symphony hall in the vicinity of the tunnel. A series of tape extensometers and optical surveys within the tunnel confirmed the success of the combination foundation system.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-8-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 8th, 12:00 AM Mar 15th, 12:00 AM

Design and Construction of the Seattle Symphony's Benaroya Hall Above an Old Railroad Tunnel

St. Louis, Missouri

Benaroya Hall, the new home of the Seattle Symphony, is located directly over an old railroad tunnel in downtown Seattle. The railroad tunnel was hand excavated in the early 1900s; the tunnel excavation caused considerable settlement of the buildings and streets above. The tunneling disturbance and subsequent rotting of timber supports resulted in numerous voids in the vicinity of the tunnel. Excavation for the Benaroya Hall removed up to 55 feet of soil overburden and came to within 12 feet of the tunnel crown. The foundations for the symphony hall were required to protect the railroad tunnel from carrying symphony hall building loads as well as preventing the hall from settling because of tunnel void collapse. A combination of drilled shafts and a foundation mat was used to support the symphony hall in the vicinity of the tunnel. A series of tape extensometers and optical surveys within the tunnel confirmed the success of the combination foundation system.