4. A falling head test was performed on the setup shown below. The water reservoir connected to the top of the soil has a diameter of 6cm and the elevation is maintained at 3cm above the sample (see Figure 1). The water reservoir connected to the bottom of the soil has a diameter of 2cm. The soil sample has a diameter of 6cm, a length of 55cm, and a saturated unit weight of 20kN/m^3. When the test started, the difference in elevationbetween the two reservoirs was 80cm; 25 minutes later, the difference in elevation decreased to 50cm. Each porous stone is 1cm thick. a) What is the hydraulic conductivity of the soil in cm/s? b) What is the difference in elevation between both reservoirs 40 minutes after the test started? c) If the same specimen is subjected to a constant head test under a head difference (difference in elevation between the two reservoirs) of 60cm, how much water will you collect in 20 min? Would you use constant head test for this soil? Diagram ad the start of test 80cm zcm diameter ung. diameter H20 3cm Porous stone Icm 55cm Soil Icm 2.5cm

4. A falling head test was performed on the setup shown below. The water reservoir connected to the top of the soil has a diameter of 6cm and the elevation is maintained at 3cm above the sample (see Figure 1). The water reservoir connected to the bottom of the soil has a diameter of 2cm. The soil sample has a diameter of 6cm, a length of 55cm, and a saturated unit weight of 20kN/m^3. When the test started, the difference in elevationbetween the two reservoirs was 80cm; 25 minutes later, the difference in elevation decreased to 50cm. Each porous stone is 1cm thick. a) What is the hydraulic conductivity of the soil in cm/s? b) What is the difference in elevation between both reservoirs 40 minutes after the test started? c) If the same specimen is subjected to a constant head test under a head difference (difference in elevation between the two reservoirs) of 60cm, how much water will you collect in 20 min? Would you use constant head test for this soil? Diagram ad the start of test 80cm zcm diameter ung. diameter H20 3cm Porous stone Icm 55cm Soil Icm 2.5cm

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Pricing Excavation and Backfill

Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.

Question

Editing
. Remember: sometimes when working on a project, you will have some information that is not needed,
and you will not have all the required information. For the problem below, list any assumptions you
make.
4. A falling head test was performed on the setup shown below. The water reservoir connected to the
top of the soil has a diameter of 6cm and the elevation is maintained at 3cm above the sample (see
Figure 1). The water reservoir connected to the bottom of the soil has a diameter of 2cm. The soil
sample has a diameter of 6cm, a length of 55cm, and a saturated unit weight of 20kN/m^3. When the
test started, the difference in elevation between the two reservoirs was 80cm; 25 minutes later, the
difference in elevation decreased to 50cm. Each porous stone is 1cm thick.
a) What is the hydraulic conductivity of the soil in cm/s?
b) What is the difference in elevation between both reservoirs 40 minutes after the test started?
c) If the same specimen is subjected to a constant head test under a head difference (difference in
elevation between the two reservoirs) of 60cm, how much water will you collect in 20 min?
Would you use constant head test for this soil?
Diagram ad the start of test
80cm
Zem diameter
diameter
H20
3cm
Porous
stone
Icm
55cm
Soil
Icm
2.5cm
I HeO

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A 50 mm diameter and 90 mm-long silty clay sample was subjected to a falling head permeameter test using a setup similar to the one shown in Figure 6.4b, where the inner diameter of the standpipe was 3.0 mm. The head dropped from 870 mm to 450 mm in 5 minutes. What is the permeability of the sample?
In a falling head permeability test, the following data was obtained: diameter of standpipe = 1.5 cm; diameter of sample = 10.16 cm; height of water level at beginning of test (h1) = 30 cm; length of sample (L) = 20 cm. The soil had a coefficient of permeability (k) equal to 3.4 x 10°cm/sec. If the test was conducted for a period of 8 hours, what was the water level at the end of the test (h2)? %3D Time when water level is at h, is t, (t,) a = area of standpipe Time when level is at 19% h, is t2 (t2) A = cross-sectional area of soil sample Soil sample
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