Permeability of Soil
Permeability is defined as the property of a porous material which permits the passage or seepage of water (or other fluids)through its interconnecting voids.
A material having continuous voids is called permeable. Gravels are highly permeable, while stiff clay is the least permeable.
4 Importance Of Study Of Seepage Analysis
The study of seepage of water through soils is important for the following engineering problems:
- Determination of rate of settlement of a saturated compressible soil layer
- Calculation of seepage through the body of earth dams, and stability of slopes.
- Calculation of uplift pressure under the hydraulic structure and their safety against piping
- Groundwater flow towards wells and drainage of soils.
then q ∞ i.A
or, q= K.i.A
K is a constant, known as the coefficient of permeability.
If a soil sample of length ‘L’ and cross-sectional area ‘A’ (measured perpendicular to the direction of flow) is subjected to a differential head of water (h1-h2), the
Limitation Of DARCY’S LAW
Coefficient Of Permeability
The coefficient of permeability is defined as the average velocity of flow that will occur through the total cross-sectional area of the soil mass under a unit hydraulic gradient. It is denoted by ‘K’ Its unit is the same as the unit of velocities such as Cm/sec or M/sec or M/Hr. etc.