Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2.
onstant inedu LOOIS
3. scale accurate to 0.01g
Coarse-grained
soil
PROCEDURE:
To measuring
cylinder
1. Identify the constant head at the source and record it. Be sure to measure from
an appropriate datum and be consistent throughout the experiment.
2. Measure the total length of the sample (AL) and determine sample cross-
sectional area (A) in cm², (Note: the sample is situated in a 2.5" inside diameter
acrylic pipe).
3. Using a 500ml beaker and a stopwatch, collect a volume of water
NOTE: choose any time interval that will allow a sufficient volume of water to collect in
the 500 ml beaker.
4. Record water temperature and determine the mass of water collected using a
scale accurate to 0.01g.
5. Repeat steps 3 and 4 at least 2 times to calculate an average flow rate.( Convert
mass of water to volume of water using an appropriate value for the density of
water and calculate the flow for each trail)
6. Using Darcy's Law calculate the hydraulic conductivity, k in cm/s
Note:
Darcy's Law: K =
ΔΗχΑ
7. Correct and report k to at a temperature of 10 °C.
Ктхпт
And K =
n
Where:
n=viscosity in different temp (table1)
Table1.
Viscosity
Temperature
(°C)
Viscosity
Temperature
(°C)
Temperature
Viscosity
(poises)
0.013077
(poises)
(°C)
(poises)
0.009579
10
16
0.011111
22
11
0.012713
17
0.010828
23
0.009358
12
0.012363
18
0.010559
24
0.009142
13
0.012028
19
0.010299
25
0.008937
14
0.011709
20
0.010050
15
0.011404
21
0.009810
Table2.
Trail no.
1
2
Average Water Temp, T (°C)
Length of sample, AL cm
12
Diameter of sample, D (cm)
2.5"
Area of sample, A cm2
Constant head, AH cm
50-10
Elapsed time, t, (sec)
20
Mass of Water, (g)
78
Volume of water, V cm3
Flow, Q (cm3/s)
k@Temp, cm/s
k10 (corrected to 10 °C) cm/s
Transcribed Image Text:Part B:
dh
Falling Head Method
+Standpipe
1. Measure the total length of the sample (AL) and
determine sample cross-sectional area (A) in cm? as well
as the cross-sectional area of the observation tube (Note:
the sample is situated in a 2.5" inside diameter acrylic
pipe and the observation tube has an inside diameter of
0.25".).
2. Record the initial head in the observation tube in (cm).
Fine-grained
soil
To beaker
3. Using a stopwatch start recording the elapsed time once you have opened the
stopcock at the bottom of the sample. Stop the watch and close the stopcock at the
same time and record the final head in the observation tube(dh cm)
4. Using Darcy's Law calculate the hydraulic conductivity, k in cm/s
L × dobs
K =
Ln
t x d?
5. Correct and report k to at a temperature of 10 °C.
Table3.
Average Water Temp, T (°C)
20
Length of sample, L cm
12
Diameter of sample, ds (cm)
2.5"
Diameter of observation tube, dobs (cm)
0.25"
Initial head, hl, (cm)
92
Final head, h2, (cm)
58
Elapsed time, t (s)
4
k@Temp, cm/s
k10 (corrected to 10 °C) cm/s
Part C:
1. Plot the GSD provided for the sample below observed in the constant head(see table)
2. Determine the D10 in mm for the sample
3. Calculate the hydraulic conductivity using Hazen's formula.(or other by using the link
http://www.people.ku.edu/~jfdevlin/Software.html#HYDROGEOSIEVEXL)
4. Submit the completed constant and falling head assignment and grain size curve.
Table4.
Sieve
Sieve
percentage
retained
No
size
cumulative mass
cumulative
(mm)
retained(g)
cumulative%
% passing
9.50
130
4
4.75
230
10
2
355
20
0.85
385
40
0.425
410
100
0.15
480
200
0.075
495
Pan
500
D10(mm)
K cm/s
USCS
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