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 4.7P
Following results are obtained for a liquid limit test using a fall cone device. Estimate the liquid limit of the soil and the flow index.
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Following 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%
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%.
For a falling head laboratory test, the following are the given values:• Length of soil specimen = 210.00 mm• Initial head = 523.00 mm• Final head = 297.00 mm• Duration of test = 3.50 mins• Area of standpipe = 42.0 sq.mm• Area of specimen = 1050.00 sq.mmA. Compute for the hydraulic conductivity of the soil in cm/sec.B. Determine the seepage velocity if n=0.35C. Determine the head difference at t = 120 sec
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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- A 50 mm diameter and 90 mm-long silty clay sample was subjected to a falling head permeameter test using a setup similar to the one shown in Figure 6.4b, where the inner diameter of the standpipe was 3.0 mm. The head dropped from 870 mm to 450 mm in 5 minutes. What is the permeability of the sample?arrow_forwardSketch the figure and determine coefficient of permeability (k) in mm/min using constant head permeability, given the following data, Water flows horizontally The height of the reservoir supply source is 2 m above the elevation of the outlet. 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.arrow_forwardThe 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_forward
- The following data are for a falling-head permeability test:• Length of the soil sample = 140 mm• Diameter of soil sample = 70 mm• Area of the standpipe = 19.6 mm2• At time t = 0, head difference = 500 mm• At time t = 7 min, head difference = 350 mma. Determine the hydraulic conductivity of the soil (cm/sec)b. What was the head difference at t = 5 min?arrow_forwardA permeability test is conducted with a sample of soil that is 60mm in diameter and 120mm in long. The head is kept constant at 225 mm. The flow is 1.5 mL in 6.5 min. What is the coefficient of permeability? (express result in m/yr).arrow_forwardThe following data are for a falling-head permeability test: Length of the soil sample = 140 mm Diameter of the soil sample = 70 mm Area of the standpipe = 19.6 mm2 At time t =0, head difference = 500 mm At time t = 7 minutes, head difference = 350 mmarrow_forward
- A permeability test is inducted with a sample of soil that is 60 mm in diameter and 120 mm long . The head is kept constant at 225 mm. The flow is 1.5 mL in 6.5 min. What is the coefficient of permeability?arrow_forwardThe data from a falling head test is shown. Diameter of standpipe: 5 cm. Initial Head: 92.68 cm. Duration of test: 19 min. Length of soil sample: 30.64 cm. Diameter of permeameter: 43 cm. If the soil permeability is 0.008 cm/min, determine the final head (in cm.) of the permeability test. Answer: 64.22arrow_forwardThe data from a falling head test is shown Diameter of the standpipe = 3cm Initial head = 91.77 cm duration of the test = 18 mins length of the soil sample = 32.98 cm diameter of the permeameter = 44 cm If the soil permeability id 0.005cm/min, determine the final head (in cm) of the permeability test.arrow_forward
- A cylindrical soil sample 50 mm in diameter and 200 mm in height is used as thepermeameter in a falling head permeability test setup. In one minute of observation, thehydraulic head in the 10 mm diameter standpipe through which test water went reducedfrom 900mm to 500 mm. During that time, 1.5 liters of water were collected in the graduate. Calculate the soil sample's permeability coefficient in cm/s.arrow_forwardFor 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?arrow_forwardA falling head permeability test was run on a soil sample 9.60 cm in diameter and 10 cm long. The head at the start was 70 cm. the coefficient of permeability of the soil was found to be 5x10^16. The diameter of the standpipe was 1 cm What is the rate of flow at the after 30 minutes?arrow_forward
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