RE: Deep Excavation r13 (Civil/Environmental) 8 Dec 20 19:46 It would be good to have your dewatering wells outside of the sheeting to help relieve pressure on the sheet piling.
BENTLEY WATER CAD SYSTEM UNBALANCED INSTALL
However, general computations usually are suitable to get you in the "Order of Magnitude" of these things, again by a geotech engineer.ĭetermining the effectiveness of the dewatering you might install wells to measure the location of the water table and observe how well the dewatering is doing. Permeability of the soil must be known to evaluate this in detail. I assume there are test borings and soil samples suitable for laboratory testing.Īs to how effective the "shafts" are in lowering the water table, it depends a lot on the details of those "shafts". These question get answered when a getech engineer with soil test data makes the required computations. RE: Deep Excavation oldestguy (Geotechnical) 8 Dec 20 19:22 Rather than think climate change and the corona virus as science, think of it as the wrath of God.
with the soil pressure on the excavation, is it possible for this to cause the base of the excavation to be ‘pushed up’? How would a person calculate this ‘uplift force’? And how would this normally be accommodated, if it happens? What effect does this have on the soil pressure? Is it just the saturated soil weight times the Ka? And is this affected by the groundwater, if the water is drained?Īnother question. The clay component is relatively impermeable and is nearly saturated (all the time it is a feature of our highly plastic clays).
BENTLEY WATER CAD SYSTEM UNBALANCED SERIES
Is it possible to determine the effectiveness of the shafts for pulling down the groundwater table? Can a series of dewatering shafts around the perimeter pull down the groundwater table? How can the effects of the groundwater be eliminated? The area of the excavation (site) is drained by means of shafts drilled into bedrock and is removing water from the aquifer as well as the site.
The effect of the groundwater is causing substantial pressure loads on the soldier pile shoring system. The watertable is approx 20’ from the bottom. It’s constructed in plastic clay with the odd sand/silt seam. It is a fairly large/deep excavation, with rolled steel soldier piles and walers.