Constant Head Permeability Test in Sand Lab Report HiI want someone do a lab report for Geotechnical Engineering Class.the rest of detels and my own data I

Constant Head Permeability Test in Sand Lab Report HiI want someone do a lab report for Geotechnical Engineering Class.the rest of detels and my own data I could not uploaded it. I will upload it after you accept my offer. Lab 6. Constant Head and Falling Head Permeability Test in Sand
(Lab13 and Lab14 in 9-5, Lab 10 in 8)
* The rate of flow of water through a soil specimen of cross-sectional area A
can be determined as
q=kiA
where q = flow in unit time, k=coefficient of permeability,
i= hydraulic gradient
k is defined as a measure of material’s capacity to transmit water
* k can be determined in the lab by
* Constant head test (for coarse grain)
* Falling head test (for coarse or fine grain soils)
வாடா
q=kiA
QL
hAt
h
then k = 9
he
iA
due to q = Q/t and
i=h/L
out Flow
OUTFLOW
Figure 3 Sketch of the combination permeameter test: Falling head (left), constant head
(right)
Falling Head Test
Constant Head Test
Allow water flowing through the sample Measure Q flowing through the sample
and measure the time (t) to drop from over a period of time (t) under a steady
the upper (h.) to the lower head (h) state head condition (h)
Water supply
Overflow pipe
Funnel
Plastic tube
* Assembly a permeameter
* Bottom porous stone
* 2/3 of compacted sandy soil
Top porous stone
* Spring
* Fix the specimen tube
Stopper
Spring
Porous stone
Plastic
cylinder
Porous stele
Scales
Stand
Stopper
Constant
head
chamber
Figure 10-1. Schematic diagram of constant head
permeability test setup
* Data Recording for constant head
* Use data sheet for Constant-Head Permeability Test : Determination
of Coefficient of Permeability in p.309 (95)
Determine Q three times with the same collection time and the same
head difference h. Then find the average value of Q and record it.
Data Recording for falling head
* Use data sheet for Falling-Head Permeability Test : Determination of
Coefficient of Permeability in p.309.
* Take a reading Vw from burette
* Read h, and h, from ruler
* Record time t from hi to h2
* Calculation
* Ignore Table 13-4 and 14-1 determination of void ratio of specimen
* Calculate k and k20-c for constant-head method
* k=
QL
7200
Aht
k20°c = kopec
* Calculate k and k20-c for falling-head method
2.303VWL hi
ητο
log
k20°c = krec
(h1 – h2)ta h2
720°C
k =
* Lab Report (see section 13.7 and 14.7 in your textbook)
– Results section should include data tables and sample calculations for
both permeability tests.
– Discuss the variation of k between two test methods.
– Discuss any sources of error
2
1
uoo
E 460
ulo
ulo
430
490
510
6oo
Soo
513.3
483.3
Constant-Head Permeability Test
Determination of Coefficient of Permeability
=
=406.6
Description of soil
Sample no
Location
Tested by
Date
Test No.
3
23.3
Item
2
xxxx Average flow, Q (cm) Repeat 3x record Avg 406d 513,3 483.3
Time of collection, 1 (s)
60 60 60
Temperature of water, T(°C)
18.5 19.5 20
Head difference, h (cm)
833 178.3 73.3
Diameter of specimen, D (cm)
7.5 7.5 7.5
Length of specimen, L (cm)
12.5 12.5 12.5
Area of specimen, A =D2 (cm)
5.
73.3
QL
k=
Aht
(cm/s)
Average k=
cm/s
Temperature of water
°C
ngoc С
K20 c =krc
720°C
cm/s
copyright Oxford University Press
Use approx. 600-700g of material.
Falling-Head Permeability Test
Determination of Coefficient of Permeability
Description of soil
Sample no.
Location
Tested by
Date
Test No.
Item
1
2.
3
7.5
125
Diameter of specimen, D (cm)
17.5
7.5
Length of specimen, L (cm)
12.5 112.5
Area of specimen, A (cm)
Beginning head difference, hi (cm) 63.5 hebt 75
Ending head difference, h2 (cm)
575
Test duration, 1 (s)
14.82 6.49
Volume of water flow through specimen,
Vw (cm)
20
45
175
57.5
llo
9.89
28
2.303V L hi
k=
log (cm/s)
(hi – h2)A h2
Average k =
cm/s Temperature of water
Пrc
K20 c =kroc
cm/s
120°c
copyright Oxford University Press
95
70

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