Displacement of Organic Soil
Displacement of Organic Soil
(OP)
We are constructing a 8m high fill for a bridge approach. Under a portion of the fill there is a mined out gravel pit approx 2-3 m deep. Some organics have accumulated in the bottom. We are only filling a portion of the old pit. Does any one have a spec for placing granular fill to maximize the displacement of the organics without excavating them?





RE: Displacement of Organic Soil
RE: Displacement of Organic Soil
RE: Displacement of Organic Soil
When the relclaimed land area was dewatered, the contractor did his best to remove the sludge. As the fill was placed, there was a displacement effect that created a "mud wave" that he then collected as needed.
I think there are details of the OP that are unknown. First how thick is the accumulation of organic matter? I mean if it's 6 or 8 inches and then you have compact sand and gravel, the risk seems low. If it's 6 or 8 inches and then below there is a natural layer of normally consolidated fat clay, then the risk is high (well, the problem being the natural soils rather than some thin accumulation of organic matter. Alternatly, if it's 5 ft thick that'd be a different matter (i.e., you may not have the advantage of some mud-wave displacement effect.
Just some ramblings. . .
f-d
¡papá gordo ain't no madre flaca!