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THE COOPER UNION
Albert Nerken School of Engineering
Soil Mechanics Laboratory
Experiment No. 6 - Constant Head Permeability Test
Name:

Date:

Group No.:
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Location: Depth: Horizon:
Boring: Elevation: Agronomic Name:
Geological Region: Sample:
Description:

Formulae:

1) kT = ql/hAt             2) k20 = kT(5T/520)(g20/gt)             3) Dr = ((1/gd min - 1/gd nat)/(1/gd min - 1/gd max))*100%

kT = coefficient of permeability, cm/s, as observed temperature k20 = coefficient of permeability corrected to 20:C
mT = absolute viscosity of liquid at T C, in g-s/cm2 m20 = absolute viscosity of liquid at 20:C, in g-s/cm2
q = quantity of water collected, in cc L = distance the head loss h occurs in, or distance between
h = head loss, in cm        piezometer outlets, in cm
A = cross-sectional area of sample, in cm2 Dr = relative density, in %
gd max = maximum dry unit weight, in pcf gd min = minimum dry unit weight, in pcf
gd nat = natural, or compacted dry unit weight, in pcf g20 = unit weight of liquid at 20:C, in g/cm3
gt = unit weight of liquid at T:C, in g/cm3 t = time to collect the water, q, in sec

 


Table 1 [Data Sheet (A)]: Sample Preparation Data

Determination Number: 1 2 3
Area of Sample, A (cm2):
Length of Sample, L' (cm):
Distance Between Piezometers, L (cm):
Total Volume of Sample, Vt (cc):
Weight of Container & Soil Before (g):
Weight of Container & Soil After (g):
Weight of Dry Soil Sample (g):
Specific Gravity, Gs:
Dry Unit Weight of Sample (pcf):
Max. Dry Unit Weight of Soil (pcf):
Min. Dry Unit Weight of Soil (pcf):
Relative Density, Dr (%):
Void Ratio of Sample, e:
Porosity of Sample, n (%):


Table 2 [Data Sheet (B)]: Run Data

Determination Number:

Run Number

Piezometer Readings

Loss in Head, h (cm) Hydraulic Gradient, i = h/L Time, t (sec) Quantity, q (cm3) Temperature, T (:C) V=q/At @ T, :C (cm/sec) V=q/At @ 20 :C (cm/sec)
h1 (cm) h2 (cm)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

 

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