Recovery of Complex Retaining Wall System Case Studies
Introduction: This picturesque, functional, and relatively new home in Birmingham, Alabama,
boasts plenty of square footage, an oversized yard, and a beautiful pool;
it has everything a family could ask for. However, lurking beneath the
surface of what looks like a dream pool was a serious problem: a settling
foundation. You might not notice it at first, but after close examination,
you would find cracks in exterior tile, uneven ground, and other symptoms
of foundation settlement.
Problem: While the pool looks simple enough on the surface, it was built on an elaborate
system of retaining walls behind the home. Within only one year of initial
construction, everything began to go south, literally. The soil beneath
the exterior pool and patio was not properly compacted, and the added
weight of the new construction quickly created a settlement problem. The
poured-concrete retaining wall around the pool was leaning forward and
several segmental masonry retaining walls were also bulging. Complicating
the situation, there was no vehicle access to the backyard where the repairs
were needed.
Proposed Solution: Alabama Ram Jack proposed using a complex and delicately engineered system
of helical piles to underpin the settling swimming pool, patio, and spa.
The piles would not only provide vertical support, but they would also
be reinforced with tie-back anchors to prevent horizontal movement and
stabilize the leaning walls. Rather than try to repair the leaning segmental
retaining walls, Ram Jack proposed the construction of a new poured-concrete
retaining wall in front of the failing one. This would not only provide
a cosmetic solution, but the wall would be constructed on top of steel
helical piles in order to ensure future settlement would not be a problem.
Outcome: All of the installation equipment and helical piles were brought in without
damaging any existing structures despite the lack of vehicular access
to the backyard. All helical piles were installed as intended, and the
new retaining wall was beautifully completed. In the end, 85 helical piles
were installed to an average depth of 10 ft., lifting the pool and surrounding
area 1.5 in. After the job was completed, the structural stability of
the patio, pool, and spa are as strong as the area is beautiful.
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