## variance in permeability in horizontal and verical directions

## variance in permeability in horizontal and verical directions

(OP)

**is there an established ratio between the permeability of a soft soil,horizontally and vertically and if so could the reference please be submitted**

## RE: variance in permeability in horizontal and verical directions

## RE: variance in permeability in horizontal and verical directions

## RE: variance in permeability in horizontal and verical directions

## RE: variance in permeability in horizontal and verical directions

## RE: variance in permeability in horizontal and verical directions

I agree with PSlem, and the answer to your specific question is no. For example, horizontal and vertical permeability will be near equal in a lacustrine (lake laid) soil deposit if the soil texture is consistent across the zone of interest (i.e all clay or silt size particals) As you encounter any horizontal bedding of different soil partical size, or size distribution differences, the horizontal permeability will likely be higher than the vertical.

I have done a bit of work in varved, fine grained soil deposits with horizontal bedding zones ranging between clay and silt to fine sand. Large scale vertical permeabilities in this deposit are on the order of 1 x 10-7 or 1 x 10-8 cm/sec, and horizontal permeabilities in the deposit are on the order of 1 x 10-4 to 1 x 10-5 cm/sec. I have also seen lacustrine clay deposits with horizontal and vertical permeabilities of approximately 1 x 10-8 cm/sec.

Vertical permeability of soft, fine grained cohesive soils can be measured in the lab on "undisturbed" Shelby tube samples. Horizontal permeability can be measured in-place by slug testing in a properly constructed well or piezometer.

Does that help?

## RE: variance in permeability in horizontal and verical directions

## RE: variance in permeability in horizontal and verical directions

## RE: variance in permeability in horizontal and verical directions