Case study | Geotechnical Engineering
IL-13 over BNSF Railroad and Marathon Drive
Illinois Department of Transportation
Crawford, Murphy and Tilly, Inc.
Kaskaskia Engineering Group, LLC (KEG) provided geotechnical services as a subconsultant to Crawford, Murphy and Tilly, Inc., to provide geotechnical analyses for the design and construction of a grade separation consisting of dual, three-span bridges on Illinois 13 over the Burlington Northern Santa Fe (BNSF) Railroad and dual, single-span bridges over Marathon Drive in Marion, Illinois.
The Illinois Department of Transportation (IDOT) wished for Illinois 13 to remain open during construction which is resulting in the use of MSE wall-supported embankments with heights of greater than 40 feet. KEG evaluated foundation improvement and temporary retaining wall options to address settlement and global stability to accommodate the proposed embankment heights during staged construction.
KEG evaluated the feasibility of a combination of final and temporary retaining structures during the course of proposed embankment construction to expedite the construction schedule, continue the flow of traffic during construction, and reduce the impacts on existing structures and adjacent property. Aesthetics were also important in choosing the type of grade separation structures due to the urban nature of the project.
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