(c) In a constant head permeability test conducted on amedium silt, the following data was obtainedHead maintained 60 cmDiameter of the permeameter = 10 cmThickness of the soil specimen 10cmDischarge collected in 2-50 min 10c.cIf a falling head test is conducted on the same samplewhat time would be required for the head to fall from60 cm to 30cm in the stand pipe which has across-section area of 1-25 cm2?8

given:Head maintained= 60 cmDiameter of the permeameter=10 cm'Thickness of the soil specimen,or the…

Answered: (c) In a constant head permeability…

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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The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):• Constant-head difference = 550 mm• Water collected in 7 min = 450 cm3• Void ratio of sand = 0.8Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocity
Problem: For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen - 16 cm Diameter of specimen - 9.6 cm Constant head difference - 50 cm Volume of water collected in 4 min - 420 cc Void ratio of the soil specimen - 0.55 A.) Determine the hydraulic conductivity of the soil in cm/sec B.) Determine the discharge velocity in cm/sec C.) Determine seepage velocity in cm/sec
From the constant head permeability test, the following values are given: Void ratio of specimen 0.46 Length of soil sample 450 mm Constant head difference 700 mm Water collected in a period of 180 seconds Cross-sectional area of soil sample 3.54 x 10-4 m³ 2.26 x 10-3 m² a.) Determine the coefficient of permeability in m/hour. b.) Compute the discharge velocity in mm/s. c.) Compute the seepage velocity in mm/s. d.) If the test was done at 24°C, what is its corrected coefficient of permeability?
For a falling head permeability test, the following are given: length of specimen is 360 mm, area of specimen is 70 cm2 , and hydraulic conductivity of soil specimen is 0.165 cm/min. what should be the area of the stand pipe for the head to drop from 700cm to 360cm in 7 mins? compute the seepage velocity under the test condition if the soil specimen has a void ratio of 0.55 in cm/sec compute the head difference at time equal to 5 minutes?
A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test. What is the soil type tested?
A constant-head permeability test is performed, and the information below indicates the test conditions and results. From the given data, provide a sketch representing the test arrangement, and calculate the value for the coefficient of permeability. On the basis of the computed value for khyd, indicate the probable soil type. Water flows horizontally through the soil sample. The height of the reservoir supply source is 2 m above the elevation of the outlet reservoir. The soil sample length in the direction of water flow is 200 mm. . The cross-sectional area of the soil sample is 1,950 mm2. The measured volume of flow for the steadystate condition is 500 ml in a 10-minute time period (note 1 ml = 1,000 mm3).
In a falling head permeameter, the sample used is 25 cm long having a cross-sectional area of 24 cm2. The cross-sectional area of the standpipe is 2 cm2. The sample of soil is made of three layers perpendicular to the direction of the flow. The thickness of the top layer is 8 cm and has a value of k1 = 4 x 10-4 cm/sec, the second layer of thickness 10 cm has k2 = 6 x 10-4 cm/sec, and the bottom layer of thickness 7 cm has k3 = 8 x 10-4 cm/sec. Calculate the time required for a drop of head from 25 to 12 cm. ( in minutes).
A sample of sand is subjected to a constant head permeability test. The sample diameter is 60 mm and its length is 130 mm. Under an applied head of 60 cm, 119 cm³ of water flows through the sample in 5 minutes. Determine (a) the coefficient of permeability, and (b) the discharge velocity.
Afalling-head permeability test is performed on a fine-grained soil. The soil sample has a length of 120 mm and a cross-sectional area of 600 mm2. The water in the standpipe flowing into the soil is 0.60 m above the top of the sample at the start of the test. It falls 50 mm in 30 minutes. The standpipe has a cross-sectional area of 200 mm2. (a) Make a sketch of the described conditions. (b) What is the coefficient of permeability in millimeters per second? (c) What is the coefficient of permeability in feet per minute? (d) On the basis of the calculated value for khyd, what is the probable soil type?
For a falling-head permeability test, the following values are given:• Length of specimen 8 in.• Area of soil specimen 1.6 in.2• Area of standpipe 0.06 in.2• Head difference at time t 0 20 in.• Head difference at time t 180 sec 12 in.Determine the hydraulic conductivity of the soil in in./sec
1. For a constant head laboratory permeability test on a fine sand, the following values are given: L = 300 mm; D₁ = 200 mm; h = 400 mm; Vol = 420 m³; t = 4 min; e = 0.55. a. Compute the coefficient of permeability in cm/sec. b. Compute the discharge velocity in cm/sec. c. Compute the velocity. seepage 2. For a falling head permeability test, the following are given. Length of specimen is 380 mm, are of specimen - 6.5 cm², hydraulic conductivity of soil specimen is 0.175 cm/min. a. What should be the area of the stand pipe for the head to drop from 650 cm to 300 cm in 8 min?
For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen: 18 cm. Diameter of specimen: 95 mm. Constant head difference: 54 cm. Volume of water collected in 4.10 min.: 423 cc Void ratio of the soil specimen: 0.54 Determine the seepage velocity in m/min.

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