Foundation Repair Case Studies: Apache Trail Retaining Wall Stabilization

The FHWA solicited a repair for the historic Apache Trail near Apache Junction, AZ.  This repair called for, among other things, compaction grouting underneath the existing dirt road to densify soils behind multiple stacked stone retaining walls.  The job also called for Polyurethane Resin Injection behind a  rock face to prevent rock fall hazards.

The area to be compaction grouted was along a dirt road that was 8’ - 12’ wide throughout.  This road also had a rock face on one side and a cliff on the other, complicating access.  To further complicate access, the road had to be open to traffic by a certain date, not allowing much time for job completion.  The stone retaining walls were built around 1920 and had to remain as a historic symbol, so constant monitoring had to be preformed to assure no damage to the walls.

Arizona Foundation Solutions compaction grouted at depths up to 15’ below grade a total of 180 CY of grout to re-stabilize the soils behind the retaining walls.

Arizona Foundation Solutions  also preformed 1,500 lbs of PUR injection to stabilize a loose rock face.