Would it be possible to reduce embankment settlement at the embankment / abutment interface by injecting lime deep into the underlying foundation ground, a deep soft delta formation? I am thinking of injecting the lime using high pressure compressed air. There would be no way to spread and mix the lime except if it permeated outward which would be only a short distance except maybe along a silt or sand layer within the clay bed. If so, this would end up as kind of lime pile, requiring many in a grid pattern. If this is possible it should strengthen the deep soil and reduce the settlement.