Excavation Dewatering rates/settlement
Excavation Dewatering rates/settlement
(OP)
Is there a good reference for dewatering rates for large excavations that are adjacent to existing structures, and/or mitigation for possible settlement of those buildings due to dewatering.
Any assitance would be helpful.
Thanks
Any assitance would be helpful.
Thanks





RE: Excavation Dewatering rates/settlement
As for the mitigation, try the chapter on underpinning by Edward White in Winterkorn and Fang's "Foundation Engineering Handbook", or "Foundation Engineering for Difficult Subsoil Conditions" by Leonardo Zeevaert. The latter practiced (practices?) in Mexico City where all the soft clays make for settlement problems any time someone digs a hole or builds a heavy structure.
Bon chance!
DRG
RE: Excavation Dewatering rates/settlement
Consider the flow path for a sheet-pile bracing design - much longer than the flow path for soldier pile and lagging. This would factor into the rate of dewatering.
Once you have some idea on the stratigraphy and the likely dewatering methods, you would then evaluate the drawdown that would likely be realized beneath the adjacent structure(s). With drawdown, the effective stresses in the soils beneath the adjacent structure(s) will increase. You then need to consider how the change in effective stress will consolidate (or compress) the subgrade soils beneath the building(s). This can be done using one-dimensional consolidation characteristics or elastic modulus (again depending on the stratigraphy.
Good luck. These are fun problems and I'd love to be working on it!
fatt-dad, c.p.g., p.e.
Richmond, Virginia
RE: Excavation Dewatering rates/settlement
RE: Excavation Dewatering rates/settlement
f-d