To accommodate anticipated rider ship increase due to the opening of Secaucus Transfer Station in 2002 and to provide schedule reliability, NJ Transit increased the number of tracks between Paterson Junction and XW interlocking. The work involved replacement of one bridge, addition to two bridges, excavation near an existing abutment footing, and construction of several hundred feet of retaining structures along the existing embankment without interrupting ongoing train operations.
YU & Associates, Inc. (YU) was retained to develop and subsequently perform a subsurface investigation and laboratory testing program. YU also performed evaluation of field and laboratory data to develop design recommendations for the proposed construction. Stabilization for excavation adjacent to existing foundations was evaluated. Retaining wall alternatives included soldier piles and lagging wall, sheet pile walls, cantilever reinforced concrete walls, modular walls, and mechanically stabilized earth walls. Seismic evaluation was part of the design requirements. Steel pipe piles and H-piles were the recommended pile alternatives for the new bridges.