This retaining wall failed due to an inadequate footing, in conjunction with, lateral earth pressure, and likely hydrostatic pressure, acting on it. The failed section of wall was removed and a properly engineered wall was constructed.
A perforated foundation drain was installed behind the wall, to provide for proper drainage away from the wall, further preventing any hydrostatic pressure. The wall is then backfilled with free-draining material.
Lateral soil pressure caused this retaining wall to fail. The wall had an inadequate footing necessary to resist the pressure from the earth and water behind it.
The wall and footing are completed and ready for drainage and backfill. This is the backside of the new wall. The fill will rise just below the top of the wall preventing surface water from flowing over the wall and onto the driveway.