Problem 2: The data from a falling head test on a silty clay are as follows:Cross-sectional area of soil80 cm?Length of soil10 cmInitial head90 cmFinal head84 cmDuration of test15 minDiameter of tube%3D6 mmTemperature22 degree C1. What is the coefficient of permeability of the sample in cm/s?2. What is the time elapsed when the potential drop is 3 cm in sec?3. What us the rate of flow at an instant when potential drop is 5 cm in cm³/hr?IIII

Given Data: Cross-section area(A)=80 cm2 Length of soil(L)=10 cm Intial head(h1)=90 cm Final…

1. What is the coefficient of permeability of the sample in cm/s? 2. What is the time elapsed when the potential drop is 3 cm in sec? 3. What us the rate of flow at an instant when potential drop is 5 cm in cm³/hr?

1. What is the coefficient of permeability of the sample in cm/s? 2. What is the time elapsed when the potential drop is 3 cm in sec? 3. What us the rate of flow at an instant when potential drop is 5 cm in cm³/hr?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Subsurface Exploration

Section: Chapter Questions

Problem 12.13P

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In a falling head permeameter, tge sample used is 18cm long havibg a cross sectional area of 22cm^2. The sample of soil is mqde of three layers. The thickness of the first layer from the top is 8cm and has a value of k1=4x10^-4 cm/sec, the second layer of thickness 8cm has k2=5.5x10^-4 cm/sec and the bottom later of thickness 4 cm has k3=7x10^-4 cm/sec. Assume that the flow is taking place perpendicular to the layers. The cross sectional area of the stand pipe is 3cm^2. A.Calculate the equivalent coefficient permeability in cm/sec of the soils ib tye direction of the flow Choices: 4.44 x10^-4 cm/s 4.97x10^-4 cm/s 3.24x10^-4 cm/s 3 53x10^-4 cm/s B.Calculate the flow rate in cm^3/hr when the head drops from 25cm to 12cm Choices: 18.20,24.58,28.42,20.65 C.Calculate the time recquired for a drop of head from 25 cm to 12 cm Choices: 58.22,62.91,97.05,60.44
The data from a falling-head test on a silty clay are: Cross-sectional area of soil: 80 cm^2; Length of soil: 10 cm ;Initial head: 90 cm ; Final head : 84 cm ; Duration of test : 15 minutes ; Diameter of tube : 6 mm ; Temperature : 22C .Determine k a. 3.47 x 10^-2 b. 2.6 x 10^-6 c. 5.0 x 10^-2 d. 6.7 x 10^-1
In a soil test, it took 16.0 min for 1508 cm3 of water to flow through a sand sample. The cross-sectional area was 50.3 cm2 .The void ratio of the soil sample was 0.68. Determine 1.The velocity of water through the soil (apparent velocity) 2.Actual velocity/ Seepage velocity Kindly answer this question as soon as possible.
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A falling head permeability test is to be performed on a soil sample whose permeability is estimated to be about 3x10-5 cm/s. What diameter of the standpipe in mm should be used if the head is to drop from 27.5cm to 20.0cm in 5 minutes and of the cross-sectional area and length of the sample are respectively 15cm2 and 8.5cm?
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The figure presents stratified soil sample in a tube that is 325 mm × 325 mm in cross-sectional area. Water is applied to create a constant head difference of 450 mm across the sample. Solve for the seepage velocity through the soil C in m/sec
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
Prob. In a constant head permeability test following results observed - Distance between piezometer tappings = 100 mm Difference of water levels in piezometers = 60 mm Diameter of test sample = 100 mm Quantity of water collected = 350 ml in 270 sec Determine the coefficient of permeability of the soil.
Geotechnical Engineering (UPVOTE WILL BE GIVEN. PLEASE ANSWER THE QUESTION CORRECLTY. NO LONG EXPLANATION NEEDED. FOLLOW THE INSTRUCTIONS CAREFULLY.) A moist soil weighed 895 g with a volume of 425 cm3. After drying, the sample weighed 775 g. Of the dried soil, 400 g was poured into a vessel loose state. Its volume subsequently determined to be 275 cm3. That same 400 g was then vibrated and tamped to a volume of 212 cm3 with Gs = 2.71. a. Determine the relative density of soil in %. b. Determine the designation of the granular soil based on its relative density.