dik
Structural
- Apr 13, 2001
- 25,792
I have a project. It is a fairly large/deep excavation, with rolled steel soldier piles and walers. The excavation is approx 7m (25’) x 9m (30’) x 11m (35’) deep. It’s constructed in plastic clay with the odd sand/silt seam. The watertable is approx 20’ from the bottom. The effect of the groundwater is causing substantial pressure loads on the soldier pile shoring system.
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. 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 clay component is relatively impermeable and is nearly saturated (all the time; it is a feature of our highly plastic clays). 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?
Another question... 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?
Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik
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. 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 clay component is relatively impermeable and is nearly saturated (all the time; it is a feature of our highly plastic clays). 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?
Another question... 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?
Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik
