Pressure Dissipation through soil
Pressure Dissipation through soil
(OP)
I am faced with a problem that I don't know the answer to. I am trying to determine how pressure dissipates through a soil, not with respect to time, but with respect to distance.
Say, for example, a soil with an initial pore pressure, is injected with a higher pressure at a point source (i.e. a well). Given that you know the permeability (k), is it possible to determine a steady state relationship between that additional pressure, and the distance required to return to the original pressure?
Anyone have any thoughts on this?
Say, for example, a soil with an initial pore pressure, is injected with a higher pressure at a point source (i.e. a well). Given that you know the permeability (k), is it possible to determine a steady state relationship between that additional pressure, and the distance required to return to the original pressure?
Anyone have any thoughts on this?





RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
Look up the basics of flow nets and very likely you will be able to solve your question.
It takes a soil mechanics text that goes into considerable detail on theoretical aspects.
Once such book is "Foundation Engineering for difficult Subsoil" conditions by Leonardo Zeevaert Printed by Van Nostrand Reinhold Co.
You probably start off with changing your excess pore pressure to a hydraulic head and go from there.
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
I may have to think on this. . .
f-d
¡papá gordo ain't no madre flaca!
RE: Pressure Dissipation through soil
Big difference here is that the orifice can flow any direction out of a hemispherical shape.
Mike McCann
MMC Engineering
RE: Pressure Dissipation through soil
I'm not saying I have the solution, I'm just thinking through the problem. . .
f-d
¡papá gordo ain't no madre flaca!
RE: Pressure Dissipation through soil
P.S. qualify "original pressure"
RE: Pressure Dissipation through soil
I'm only trying to calibrate myself to some modelling that was done (by someone else). For my purposes, I am assuming a homogeneous sand layer, approximately 2m thick at a depth of 30 m. Therefore the initial pore pressure is approx. 295 kPa. In this case, I have a well injecting up to 1200 kPa.
I guess the distance is also time dependant; the more time the pressure is applied, the further the pressure front will advance.
RE: Pressure Dissipation through soil
f-d
¡papá gordo ain't no madre flaca!
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
f-d
¡papá gordo ain't no madre flaca!
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
Confused. . . . (well, I kind of am confused if you aren't)?
f-d
¡papá gordo ain't no madre flaca!
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
RE: Pressure Dissipation through soil
I suggested finite elements related to transient pore pressure dissipation with respect to earth pressures. Seep/W cannot address that.
f-d
¡papá gordo ain't no madre flaca!