Hyrdaulic Conductivity in Shelby Tube.
Hyrdaulic Conductivity in Shelby Tube.
(OP)
Has anybody tried to run Hydraulic conductivity within a 6 inch Shelby Tube granular sample? I have a client who says they cannot have a remolded sample. I told them that I am allowed to remold the sample to the same density as it was in the tube (ASTM 2434). He thinks that the granular sample will somehow be altered from an in-situ condition. I tried to explained that the particles are not being damaged just rearranged back into there original configuration.





RE: Hyrdaulic Conductivity in Shelby Tube.
f-d
¡papá gordo ain’t no madre flaca!
RE: Hyrdaulic Conductivity in Shelby Tube.
RE: Hyrdaulic Conductivity in Shelby Tube.
ht
(please recognize that permeability is presented in 10^-4 cm/sec units and there is one axis that's D10 and another axis that's D20).
What you really need to do is a slug test. Rather than spend time and money on the Shelby tube, just do a hand auger or drill another boring and insert a PVC well screen with gravel pack and do a falling or rising head "slug" test. Here's a nice publication on how to interpret slug testing:
http://home.comcast.net/~fatt-dad/slug-test.pdf
Good luck.
f-d
¡papá gordo ain’t no madre flaca!
RE: Hyrdaulic Conductivity in Shelby Tube.
There is testing equipment available to perform the test right in the Shelby tube. Never used it.
T
RE: Hyrdaulic Conductivity in Shelby Tube.
RE: Hyrdaulic Conductivity in Shelby Tube.
The main thing is keeping the sample intact and having proper filter on the discharge end. You may have to use a series of coarser gradations, but very likely in thin steps of larger and larger grain size. That is not likely to affect your answer. I hope the client doesn't want an answer with three or more significant figures. You'd be darn lucky to have the first one very accurate. It may be precise, but pretty wrong.
To begin with that client probably thinks getting the sample that way doesn't affect it. Right? Sounds like he needs some educating.
Send him here and let him explain it to us.
Those in-place tests are best, in my view.
RE: Hyrdaulic Conductivity in Shelby Tube.
f-d
¡papá gordo ain’t no madre flaca!
RE: Hyrdaulic Conductivity in Shelby Tube.
RE: Hyrdaulic Conductivity in Shelby Tube.
I love these types of problems, but they really do require wells to document the flow gradient, ground water contours and also a series of slug tests.
How deep is the water table? Is the chemical of concern heavier or lighter than water?
f-d
¡papá gordo ain’t no madre flaca!
RE: Hyrdaulic Conductivity in Shelby Tube.
Good luck.