Liberty University Twin Box Tunnels Through Railroad Embankment

Lynchburg, Virginia

ENR Mid-Atlantic Region “BEST SMALL PROJECT AWARD” 2014

ENR Mid-Atlantic Region “BEST PROJECT SAFETY AWARD” 2014

ACEC Virginia Engineering Excellence “GRAND AWARD” winner – November 2014

This project, designed and managed by Brierley Associates with assistance from Elwyn & Palmer Consulting Engineers, PLLC, is located on the campus of Liberty University on Regents Parkway north of the intersection with Williams Stadium road on the west side of the campus. The project consists of two, two-lane, 130-ft long vehicular tunnels installed by Southland Contracting, Inc by box-tunnel jacking methods beneath three Norfolk Southern railway lines at the southern end of their railway yard in Lynchburg, VA. Approximately 30 trains, including two AMTRAK trains, pass through the yard each day.

The two vehicular tunnels provide ingress and egress to and from Liberty University at the intersection of Ward Road and Harvard Street. Elements of this project include installation of temporary excavation support systems for the launching and receiving areas; installation of geotechnical instrumentation to monitor ground deformations; installation of spiling to control ground loss at the heading and mitigate deformation of the railways; installation of conduits through the embankment to protect post-tensioning tendons; construction of a reinforced concrete launching pad; construction of a reaction block and a stable working surface at the receiving area; construction of two, 130-ft long concrete tunnel boxes, including a cutting shield, at the launching area; and jacking the two tunnel boxes to the final location.

Jacking of the North Tunnel was completed in December 2013 and the South Tunnel was completed in January 2014.

Click on Twin Box Tunnels to view a time lapse video of the second tunnel installation

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