We are looking to execute an "emergency" repair where we utilize "baby" A stone to build a dike that can retain (some) water or at least reduce flow across a flood plain until it overtops. The structure is basically a dike. The referenced material is what is most readily available on site. Top...
We have an earthfill embankment job were we are providing a method spec for compaction. The spec only allows for CL and CH materials. So we specify equipment, weight, pressure and number of passes. It is being recommended that we use the above referenced ASTM and associated equipment to performe...
Update:
The contractor is proposing the jetting due to slow production while attempting to drive the sheets through a very dense sand layer that is inter bedded between two softer clay layers. My concern still remains especially since the original design assumed some substantial bending moments...
Does anybody have experience in successfully utilizing “jetted” sheet piles as an installation method for sheet piles that were going to be used as part of a temporary retaining structure (TRS)? I have never encountered a need to use jetting for installation and have always been skeptical of...
It is a mix of soil (sands and silts), cement and bentonite. Also known as self-hardening slurry. The coring is for verification of permeability specifications.
It is surface coring utilizing some kind of wire line or conventional technique. I’m not clear on the specifics of the coring system...
Hello,
I’m trying to get some general feedback on the benefits or problems with coring through low strength material in order to validate permeability requirements are within specifications. The material is testing at about ~200 psi 28 day right now.
I have heard both good and bad things from...
Can anyone provide me some information about tapered steel piles. I'm mostly looking for manufacturers but any other info will also be helpful.
I know that traditionally tapered piles have been timber because of the natural taper but I am working with a structural engineer and he is showing...
Hello all.
I am working as the geotech engineer on a project where we will need to drive some sheet piles and some timber piles in a heavily urbanized area. We will be very close to existing piles for bridges, etc..
Is there any information out there be it papers, guidance, etc... That could...
GeoPave - In fact it is THE Metro East Sanitary District Levee.
I think I will give the 3D run a try with Modflow.
dgillette - I like the idea of a slight overlap based on the geology but I think that a full overlap like has been proposed is quite over designed.
Thanks to all! Ill keep...
I understand you concerns and I’m not bothered by your comments them because I agree with them and live my life by them.
Maybe I wasn’t clear about where I stand on this issue. Before I posted I was convinced that an overlap was not needed because I have run models with different scenarios (as...
Thanks cvg,
The seepage problem in that specific reach is so severe that our analysis requires wells spaced at less than 10 ft sometimes less than 5 ft. We have seen that when you begin to space wells at less than 50 ft. their capacity to control the underseepage is reduced.
Its only natural...
Thanks for the posts Mike!
This is a real engineering problem and the seepage analysis methods we use are the Maunsr and Kauffman Methods from the 40's and 50's.
We have not run a 3D model because I don't think we don't have the capabilities. The initial "fix" was determined with the M and K...
"sufficient flow can develop to increase the pore water pressures through the foundation silt, through the sand layer, back through (upwards) the foundation silt and then to boil."
That’s a good point but the river we deal with is the Mississippi and the seepage entrance condition is considered...
the modeling is done with Geo-Studio 2007 and their Seep/W platform.
The places where fixes are needed and what those fixes are were based on a previous seepage analysis that was performed and back checked and confirmed by the historical observations.
I should’ve explained that the colors...
