Q1/[B]: In a falling head permeameter, the sample used is 16 cm long having a cross-sectional area of 24 cm². Calculate the time required for a drop of head from 25 to 12 cm if the cross sectional area of the stand pipe is 2 cm². The sample of soil is made of three layers. The thickness of the first layer from the top is 6 cm and has a value of k, = 2 x 10 cm/sec, the second layer of thickness 6 cm has k₂ = 5 x 10 cm/sec and the bottom layer of kness 4 cm has k3 = 7 x 10 cm/sec. Assume that the flow is taking place perpendiculor to the la

Q1/[B]: In a falling head permeameter, the sample used is 16 cm long having a cross-sectional area of 24 cm². Calculate the time required for a drop of head from 25 to 12 cm if the cross sectional area of the stand pipe is 2 cm². The sample of soil is made of three layers. The thickness of the first layer from the top is 6 cm and has a value of k, = 2 x 10 cm/sec, the second layer of thickness 6 cm has k₂ = 5 x 10 cm/sec and the bottom layer of kness 4 cm has k3 = 7 x 10 cm/sec. Assume that the flow is taking place perpendiculor to the la

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.14P

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Concept explainers

Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.

Question

Soil mechanics ضهقحشكوظز

Q1/[B]: In a falling head permeameter, the sample used is 16 cm long having a cross-sectional area of 24 cm².
Calculate the time required for a drop of head from 25 to 12 cm if the cross sectional area of the stand pipe is 2
cm². The sample of soil is made of three layers. The thickness of the first layer from the top is 6 cm and has a value
of ki
2 x 10 cm/sec, the second layer of thickness 6 cm has k₂ = 5 x 10 cm/sec and the bottom layer of
kness 4 cm has k3=7 x 10 cm/sec. Assume that the flow is taking place perpendicular to the layers.

Branch of science that deals with the stationary and moving bodies under the influence of forces.

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In a falling permeameter, the sample used is 20 cm long having a cross sectional area of 24 cm2. The sample of soil is made of three layers. The thickness of the first layer from the top is 8 cm and has a value of k1 = 2 x 10-4 cm/s, the second layer of thickness 6 cm has k2 = 5 x 10-4 cm/s and the bottom layer of thickness 4 cm has k3 = 7 x 10-4 cm/s. Assume the flow is taking perpendicular to the layers. Calculate the time required for the drop of head from 25 to 12 cm if the cross sectional area of the stand pipe is 2 cm2. a.71.5 min b.62.9 min c.87.8 min d.66.7 min e.58.81 min
In a falling permeameter, the sample used is 20 cm long having a cross-sectional area of 24 cm2. The sample of soil is made of three layers. The thickness of the first layer from the top is 8 cm and has a value of k1 = 2 x 10-4 cm/s, the second layer of thickness 6 cm has k2 = 5 x 10-4 cm/s and the bottom layer of thickness 4 cm has k3 = 7 x 10-4 cm/s. Assume the flow is taking perpendicular to the layers. Estimate the average hydraulic conductivity of soil in the vertical direction. a.3.12 x 10-4 cm/s b.5.69 x 10-4 cm/s c.2.35 x 10-4 cm/s d.4.28 x 10-4 cm/s e.6.69 x 10-4 cm/s
In falling head permeability test the initial head was 350 mm and the final head was 50 mm. The cross-sectional area of the burette was 200 mm2. The sample was 50 mm in diameter and 100 mm long. If the test took 8 hours and 45 minutes, what was the coefficient of permeability of the soil in m/s? a.7.15 x 10-7 m/s b.6.29 x 10-7 m/s c.7.89 x 10-7 m/s d.8.78 x 10-7 m/s e.5.69 x 10-7 m/s
The coefficient of permeability of a soil sample was found out in a soil mechanics laboratory by making use of a falling head permeameter. The data used and the test results obtained were as follows: Determine the coefficient of permeability in m/day. a. 10.4b. 2.25c. 5.5d. 6.2
A glass cylinder 5 cm internal diameter and with a screen at the bottom was used as a falling head permeameter. The thickness of the sample was 10 cm. With the water level in the tube at the start of the test as 50 cm above the tail water, it dropped by 10 cm in one minute, the tail water level remaining unchanged. Calculate the value of k (cm/s) for the sample of the soil.
A glass cylinder 5 cm internal diameter and with a screen at the bottom was used as a falling head permeameter. The thickness of the sample was 10 cm. With the water Level in the tube at the start of the test as 50 cm above the tail water, it dropped by 10 cm in one minute, the tail water level remaining unchanged. Calculate the value of k for the sample of the soil, Comment on the nature of the soil,
In falling head permeability test the initial head was 350 mm and the final head was 60 mm. The cross-sectional area of the burette was 200 mm2. The sample was 50 mm in diameter and 105 mm long. If the test took 8 hours and 30 minutes, what was the coefficient of permeability of the soil in m/s?
7: In a falling head permeameter, the sample used is 20cm long having a cross-sectional area of 24cm?. Calculate the time required for a drop of head from 25 to 12cm if the cross-sectional area of the stand pipe is 2cm?. The sample of soil is made of three layers. The thickness of the first layer from the top is 8cm and has a value of ki = 2 x 104 cm/s, the second layer of thickness 8 cm has k2 = 5 x 104 cm/s and the bottom layer of thickness 4cm has k3 = 7 x 104 cm/s. Assume that the flow is taking place perpendicular to the layers. Answer: t = 3771 s = 62.9 minutes
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Q1/ specimen of the fine-grained soil, 75 mm in diameter and 20 mm thick was tested in an oedometer in a laboratory. At applying pressure (240 kN/m²), the time with dial gauge readings are: Time (min) 0 Settlement (mm) 0 0.25 1 0.22 0.42 Vertical pressure (kPa) 15 Settlement (mm) 0.1 Void ratio 1.88 4 0.6 30 0.11 1.87 9 0.71 16 0.79 And the void ratio and settlement for each load increment is shown in the table below. 60 0.21 1.85 120 1.13 1.72 100 1.04 36 64 0.91 0.86 240 2.17 1.57 480 3.15 1.43 1- Find Coefficient of consolidation in cm²/s using root time and TV90% = 0.848. 2- Find Preconsolidation pressure (oc) and compression index (Cc). Scanned by TapScanner
9. An experimental setup in the laboratory is shown. Two 50 mm diameter soil samples A and B are placed under constant head. (All dimensions are in mm.) The permeability of sample A is twice that of sample B. Assuming the tail water level as the datum, what is the total head at the interface between the soil samples? If 200 ml of water flows through the sample in 5 minutes, determine the permeabilities of the two soil samples. Water 412 140 Answer: 62.5 mm, 0.076 cm/s, 0.038 cm/s 4 B Datum 287
From the constant head permeability test arrangement shown, the following values are given: Void ratio of specimen = 0.46 Length of Soil Sample = 450mm Constant head difference = 700mm Water collected in a period of 3 min = 0.000354 m3 Cross-sectional Area of Soil Sample = 0.00226 m2 Determine the coefficient permeability in m/hour (Ans: 2.102 m/hr) Compute the discharge of velocity in m/min. (Ans: 0.052 m/min) Compute the seepage velocity in m/min. (Ans: 0.165 m/min)