Geology Reference
In-Depth Information
Soils Testing Laboratory
Permeability Test:
Constant-Head Method
Sample No.
Project No.
Location
Boring No.
Depth of Sample
Date of Test
Tested by
Description of Soil
[A] Unit Weight Determination
(1)
Length between manometer outlets, L
cm
(2)
Diameter of soil specimen, D
cm
i.e.
,
p
D
2
4
(3)
Cross-sectional area of soil specimen
c
d
cm
2
(4)
Height, H
1
cm
(5)
Height, H
2
cm
(6)
Height of specimen (i.e., H
1
H
2
)
cm
(7)
Volume of specimen [(3)
(6)]
cm
3
(8)
Mass of air-dried soil before compaction, M
1
g
(9)
Mass of unused remaining portion of soil after compaction, M
2
g
(10)
Mass of soil specimen (air dried) [(8)
(9)]
g
c
1
10
2
lb/ft
3
(11)
Unit weight of soil specimen (air dried)
62.4
d
1
7
2
(12)
Water content of air dried soil
%
(a)
Can no.
(b)
Mass of air-dried soil
can
g
(c)
Mass of oven-dried soil
can
g
(d)
Mass of can
g
(e)
Mass of water
g
(f)
Mass of oven-dried soil
g
c
(e)
(g)
Water content
(f )
100
d
%
(11)
(12)
lb/ft
3
(13)
Dry unit weight of soil specimen
c
100
100
d
(14)
Specific gravity of soil
c
(13)
(14) 62.4
ft
3
(15)
Volume of solids
d
ft
3
(16)
Volume of voids [1
(15)]
c
1
16
2
(17)
Void ratio, e, of soil specimen
d
1
15
2
267
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