FALLING HEAD PERMEABILITY TESTOTHER QUESTIONS:1. What is the importance of finding the coefficient of permeability of soils?2. What is the difference between constant head permeability test and falling head permeability test?3. Why is it needed to fully saturate the soil first before conducting the experiment?4. Why is there a need to remove air bubbles from the specimen? Determination of Coefficient of PermeabilityTest No.12Diameter of specimen, D(cm)Length of specimen, L (cm)6.356.356.3513.213.23.2Area of specimen, A (cm)31.6731.6731.6775.070.0Beginning head difference,h1 (cm)Ending head difference,h2 (cm)Test duration, t (s)65.034.025.020.020.419.315.4Volume of water flow746857through the specimen,V„ (cm³)2.303V„Lh1k =(h1-h2)tAlog는 (cm/s?)h2Average k =NT°Ck20°c = kr°cN20°CVariation of Nr°c/N20°CTemperature, T(°C)Temperature, T(°C)N7°C/N20°C1.135/n20°C15230.931161.106240.910171.077250.889181.051260.869191.025270.850201.000280.832210.976290.814220.953300.797 Determination of Void Ratio of SpecimenDescription of Soil: SandLength of Specimen (L): 13.2 cmDiameter of Specimen (D): 6.35 cmTemperature: 27°CVolume of Specimen, V= D²L(cm²)Specific gravity of soil solids, G,2.66Mass of specimen tube with fittings, W1 (g)238.4Mass of tube fittings and specimen, W2 (g)965.3Dry density of specimen, pa-!W2 -W1 (g/cm3)VGsPwVoid ratio of specimen, e =Pd1|(Note: pw=1g/cm³)

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Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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FALLING HEAD PERMEABILITY TEST OTHER QUESTIONS: 1. What is the importance of finding the coefficient of permeability of soils? 2. What is the difference between constant head permeability test and falling head permeability test? 3. Why is it needed to fully saturate the soil first before conducting the experiment? 4. Why is there a need to remove air bubbles from the specimen?

Determination of Coefficient of Permeability
Test No.
1
2
Diameter of specimen, D
(cm)
Length of specimen, L (cm)
6.35
6.35
6.35
13.2
13.2
3.2
Area of specimen, A (cm)
31.67
31.67
31.67
75.0
70.0
Beginning head difference,
h1 (cm)
Ending head difference,
h2 (cm)
Test duration, t (s)
65.0
34.0
25.0
20.0
20.4
19.3
15.4
Volume of water flow
74
68
57
through the specimen,
V„ (cm³)
2.303V„L
h1
k =
(h1-h2)tA
log는 (cm/s?)
h2
Average k =
NT°C
k20°c = kr°c
N20°C
Variation of Nr°c/N20°C
Temperature, T
(°C)
Temperature, T
(°C)
N7°C
/N20°C
1.135
/n20°C
15
23
0.931
16
1.106
24
0.910
17
1.077
25
0.889
18
1.051
26
0.869
19
1.025
27
0.850
20
1.000
28
0.832
21
0.976
29
0.814
22
0.953
30
0.797

Determination of Void Ratio of Specimen
Description of Soil: Sand
Length of Specimen (L): 13.2 cm
Diameter of Specimen (D): 6.35 cm
Temperature: 27°C
Volume of Specimen, V= D²L(cm²)
Specific gravity of soil solids, G,
2.66
Mass of specimen tube with fittings, W1 (g)
238.4
Mass of tube fittings and specimen, W2 (g)
965.3
Dry density of specimen, pa-!
W2 -W1 (g/cm3)
V
GsPw
Void ratio of specimen, e =
Pd
1
|
(Note: pw=1g/cm³)

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