The Michigan Street North Pedestrian Tunnel connects the Lemmen Holton Oncology Center of Grand Rapids with the future Spectrum Health building.
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.
Grand Rapids, Michigan
130 feet (40 meters)
Approximately 340 square feet (32 square meters)
Medium Dense Glacial Sands; Groundwater Table Below Tunnel Invert
Approximately $2.5 Million
Kiewit Construction Company
Spectrum Health System