Monitoring of Tensar MSE Walls - Route 22 Over Liberty Avenue and Conrail

This scope of work includes the geotechnical construction support services for a monitoring program for the Tensar mechanically stabilized earth (MSE) walls that have been proposed by the Contractor for use on the subject project. Tensar walls are not on New Jersey Department of Transportation's (NJDOT’s) pre-approved list of allowable MSE walls for walls greater than 20 feet tall, or for walls that support spread footing abutments. Union Paving requested that they be allowed for this project, and NJDOT agreed to permit their use for this project. The monitoring program will consist of 9 strain gage pairs attached to the wall geogrid reinforcement, four tilt meters attached to the wall faces and abutment, and automated optical survey of wall facing. An instrumentation specialty consultant provided the service for the MSE wall instrumentation installation and short-term monitoring during construction as part of the Federal Highway Administration (FHWA) Long-Term Bridge Performance Program. After the Tensar MSE wall construction is completed, Rutgers University continued to monitor and receive data to evaluate the MSE wall performance over time and report to NJDOT, also as a part of the FHWA Long-Term Bridge Performance Program.