Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Case Studies of Building Behavior in Response to Adjacent Excavation
A substantial portion of the cost of soft ground tunnels and braced excavations in urban environments is devoted to the protection and repair of adjacent structures and utilities. Often, the choice between cut-and-cover tunnel construction is based on the potential ground movements associated with each method and the anticipated response of the nearby buildings to these ground movements. In some instances, the locations of tunnel routes and large braced excavations are selected to avoid large and/or sensitive structures. This report summarizes one year of field observations and data collection of the ground movement and resultant building distortion and change in response to underground construction. It documents case histories of the distortion and damage to structures adjacent to tunnels and excavations. Measurements of ground movements and building response were made at two test sites in Washington, D.C. The sites were a nine-story apartment building adjacent to a 60-foot-deep opencut and a pair of two-story brick-bearing wall structures near two 21-foot-diameter tunnels. The structures at the test sites were instrumented to measure settlement and tilt of the bearing walls and foundations. Both lateral and diagonal displacements were measured with tape extensometers extending between column lines and bearing walls at various floor levels in the structures. From these data, the slope of the settlement trough could be separated into the components causing angular distortion and tilt of the structure. Lateral extension, shearing, or bending could also be distinguished from the data. Additional data were gathered at other sites in Washington, D.C. and in Chicago, Illinois through construction records and field inspections. The ground surface settlement data, building response data, and the progress of the excavation are compared and related.
Case Studies of Building Behavior in Response to Adjacent Excavation
A substantial portion of the cost of soft ground tunnels and braced excavations in urban environments is devoted to the protection and repair of adjacent structures and utilities. Often, the choice between cut-and-cover tunnel construction is based on the potential ground movements associated with each method and the anticipated response of the nearby buildings to these ground movements. In some instances, the locations of tunnel routes and large braced excavations are selected to avoid large and/or sensitive structures. This report summarizes one year of field observations and data collection of the ground movement and resultant building distortion and change in response to underground construction. It documents case histories of the distortion and damage to structures adjacent to tunnels and excavations. Measurements of ground movements and building response were made at two test sites in Washington, D.C. The sites were a nine-story apartment building adjacent to a 60-foot-deep opencut and a pair of two-story brick-bearing wall structures near two 21-foot-diameter tunnels. The structures at the test sites were instrumented to measure settlement and tilt of the bearing walls and foundations. Both lateral and diagonal displacements were measured with tape extensometers extending between column lines and bearing walls at various floor levels in the structures. From these data, the slope of the settlement trough could be separated into the components causing angular distortion and tilt of the structure. Lateral extension, shearing, or bending could also be distinguished from the data. Additional data were gathered at other sites in Washington, D.C. and in Chicago, Illinois through construction records and field inspections. The ground surface settlement data, building response data, and the progress of the excavation are compared and related.
Case Studies of Building Behavior in Response to Adjacent Excavation
M. D. Boscardin (Autor:in) / E. J. Cording (Autor:in) / T. D. O'Rourke (Autor:in)
1978
141 pages
Report
Keine Angabe
Englisch
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