For a falling-head permeability test, the following valuesare given:Length of specimen = 200 mm%3DArea of soil specimen = 1000 mm^2%3DArea of standpipe = 40 mm^2Head difference at time t = 0 = 500 mmHead difference at timt t 180 seconds = 350 mm%D%3DDetermine the hydraulic conductivity of the soil inx10 4 cmsec

Answered: For a falling-head permeability test,…

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 hydraulic conductivity of a soil sample (3.4 x 10-4 cm/s) has been determined via a permeability test. The water temperature was 28°C at the time of experiment. What is the hydraulic conductivity of the sample at the standard temperature of 20°C?
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(e) A soil profile consists of a clay layer between layers of sand, the water table being in theupper sand layer. Before the construction of a raft foundation for a large reservoir, piezometers were placed in the saturated clay layer. The whole process of filling the reservoir may be approximated to applying rapidly a single pressure increment of 200 kPa uniformly throughout the clay layer. One year after filling the reservoir, the piezometers indicated a distribution of excess porewater pressure as indicated in Figure Q-e. Estimate the average degree of consolidation at this time.
The figure shows the layers of soil in a tube that is 100mm x 100 mm in cross section. Water is supplied to maintain a constant head difference of 450 mm across the sample. The hydraulic conductivity of the soils in the direction of flow through them are given below. Compute the equivalent hydraulic conductivity in m/hr. Water supply h=450 mm Out flow Direction of flow Soil Soil Soil A B 200 200 200 mm mm mm K, = 2 x 10-4 cm/s KR = 3.7 x 10-2 cm/s Kc = 1.2 x 10 -5 cm/s Select one: a. 0.002124 b. 0.002412 c. 0.001224 d. 0.004221
In a constant head permeability test in the laboratory as shown in Figure Q2(e), the data is recorded in Table Q2(b). The void ratio of the soil specimen is 0.46. Determine; (i) Hydraulic conductivity, k, of the soil in cm/sec. (ii) Discharge velocity in cm/sec.
Problem (2) The following data are for a variable head permeability test: Area of soil specimen=1200mm? Length of the soil specimen = 150mm Area of the standpipe = 1.3cm² At time t=0, head difference = 750mm At time t=2min, head difference = 500mm 2 %3D a) Find the hydraulic conductivity of the soil in cm/min.
Calculate the hydraulic conductivity of the soil in cm/sec. Determine the seepage velocity, in cm/sec, if the porosity of soil is 0.25. Find the head difference, in mm, at t = 100 seconds.
The figure shows a granular soil in a tank having a downward seepage. The water level in the tank is held constant by adjusting the supply from the top and the outflow at the bottom. The void ratio of the soil is 0.50 and the specific gravity is 2.7. H,0 0.8 m 1.1 m A 3.6 m 5.4 m B C Il a plezometer is placed at point B, to what height the water will rise above this point?
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
For a falling head permeability test, the following values are given: Length of specimen: 200 mm Area of specimen:1000 sq. mm Area of standpipe: 40 sq. mm Head difference at t= 0: 500 mm Head difference at t= 180 sec : 300 mm Determine the hydraulic conductivity (cm/sec)
Q: The constant-head permeability test arrangement in a two-layered soil has been arranged as shown in Figure. During the test, it was seen that when a constant head of h₁= 220 mm was maintained, the magnitude of h2 was 70 n If ki is 0.005 cm/sec, determine the value of k2. (given that H₁-120 mm and H₂= 160 mm). h₁ Soil 1 (ky) ►1 Soil 2 (k₂) Water supply T h TT H₁ H₂ ©ⒸCengage Learning 2014
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 Problem: For a falling head permeability test, the following are given: Length of Soil Specimen - 200mm Area of Soil Specimen - 1000mm^2 Area of Stand pipe - 40mm^2 Head Difference at time t = 0 min - 500mm Head Difference at time t = 3 min - 300mm A.) Compute hydraulic conductivity of the soil in cm/sec B.) Compute the seepage velocity if the porosity is 0.25 in cm/sec C.) What is the head difference at time t = 100 sec in mm

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