Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 4, Problem 4.9P
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Find the liquid limit value of the soil using fall cone method.
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Problem # 1. A constant head permeability test is performed on a sample of granular soil. The length of the soil sample is 15 cm and the cross-sectional area is 10 cm^2. If a 24 cm^3 volume of water passes through the oil sample in a 3-minute period and the constant head is 30 cm determine the followinga. Determine the coefficient of permeability of the soil.b. Find the discharge velocity.c. Compute the seepage velocity if the void ratio is 0.64.
A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution.
a) Compute the permeability based on these test conditions and results.
b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values, provide step by step solution solving h1 and h2 values.
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?
Chapter 4 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 4 - During Atterberg limit tests in the soil mechanics...Ch. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Results from a liquid limit test conducted on a...Ch. 4 - The following data were obtained by conducting...Ch. 4 - Refer to the soil in Problem 4.5. Using the...Ch. 4 - Following results are obtained for a liquid limit...Ch. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - Prob. 4.10P
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- please solve B only. subject: geotechnical Engineering A sample coarse grained soil is 50mm. In diameter and 150mm long was tested in a constant-head apparatus. The soil sample was prepared at a void ratio of 1.5. The total head was kept constant at 300mm and the amount of water is collected in 4 sec. was 50cm^3. The test temperature was 22°Ca.) Compute the temperature correction factor.b.) Compute the corrected coefficient of permeability in cm/sec. c.) Compute the interstitial velocity.arrow_forwardProblem: 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 mmarrow_forwardFollowing are the results from the liquid and plastic limit tests for a soil. Liquid limit test: Plastic limit test: PL = 18.7%a. Draw the flow curve and obtain the liquid limit.b. What is the plasticity index of the soil? c. Determine the liquidity index of the soil when the in situmoisture content is 26%arrow_forward
- The following results were recorded during a Falling head permeability test: Sample diameter = 120 mm Sample length = 140 mm Initial head = 510 mm Final head = 310 mm Standpipe diameter = 6 mm Duration of flow = 3.4 mins Determine the coefficient of permeability for the soil in m/s. Based on the coefficient of permeability estimate the soil typearrow_forwardCoefficient Permeability of Soil A falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cmand its length or thickness is 7.8 cm. The diameter of the standpipe is 6.0 mm. The head at thestart of the test is 47.8 cm. The test lasts 8.5 min and the head falls to 22.6 cm. Find thecoefficient of permeability of this soil in cm/s? Provide step by step solution.arrow_forwardFrom 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)arrow_forward
- Subject: Soil Mechanics Please provide a solution and a diagram For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. a. 1.081 x 10^-3 b. 2.56 x 10^-2 c. 1.31 x 10^-7 d. 1.23 x10 ^-5arrow_forwardDuring a falling head test, the head fell from 80cm to 65cm in 83 seconds. The specimen was 5cm in diameter and had a length of 100mm. the diameter of the standpipe was 0.80 cm. Temperature during the test is 90deg. C. a.) Compute the coefficient of permeability of the soil at 20deg. C _____cm/min b.) Compute Seepage velocity if the void ratio is 0.90 _____cm/min c.) Determine the Rate of flow _____cm/minarrow_forwardA block of soil in a permeability test has a length of 120 mm and a cross-sectional area of 600 mm2. The water level at one end is 200 mm above a fixed datum and at the other end is 30 mm above the same plane. The flow rate was 2 ml in 90 seconds. Compute the coefficient of permeability of the soil in m/s. a.2.61 x 10-5 m/s b.0.98 x 10-5 m/s c.1.78 x 10-5 m/s d.3.97 x 10-5 m/s e.1.89 x 10-5 m/sarrow_forward
- Results from liquid and plastic limit tests conducted on a soil are given below.Liquid limit tests: Plastic limit tests: PL = 19.1%a. Draw the flow curve and obtain the liquid limit.b. What is the plasticity index of the soil? c.Determine the liquidity index of the soil if Winsitu = 21%.arrow_forwardThe following data were obtained by conducting liquid limit and plastic limit tests on a soil collected from the site. Liquid limit tests: Plastic limit test: PL = 19.3% a. Draw the flow curve and determine the liquid limit. b. Using the Casagrande plasticity chart (Figure 4.21), determine the soil type.arrow_forwardFollowing results are obtained for a liquid limit test using a fall cone device. Estimate the liquid limit of the soil and the flow index.arrow_forward
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