The Michigan Street North Pedestrian Tunnel connects the Lemmen Holton Oncology Center of Grand Rapids with the future Spectrum Health building.
Tunnel Design and Construction Support Services:
Gall Zeidler Consultants provided construction support services that included shop drawings and New Austrian Tunneling Method (NATM) consulting, particularly related to instrumentation and monitoring.
The mined tunnel was constructed using 15 inch (380 millimeter) thick shotcrete combined with a PVC waterproofing membrane located between the initial and final shotcrete lining layers. To achieve ground improvement, the glacial sands surrounding the tunnel perimeter were grouted using chemical grouts prior to tunnel construction.