Frost, this will effect all retaining walls Therefore the retaining wall will have to be made solid plenty of to offset the pushing drive with the soil it's Keeping again. One cubic foot of moist soil can weigh as many as one hundred lbs. With dry stonewalls (described additional down) http://drystonewallingleeds80257.ttblogs.com/2350662/details-fiction-and-dry-stone-walling-yorkshire