Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 17, Problem 7P
To determine
Liquid limit of the soil using the plot of the flow curve
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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%
A 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).
A constant-head permeability test is performed in a laboratory where the soil sample is 25 cm in length and 6 cm2 in cross section. The height of water is maintained at 2 ft at the inflow end and 6 in. at the outlet end. The quantity of water flowing through the sample is 200 ml in 2 minutes.
(a) Make a sketch of the described conditions.
(b) What is the coefficient of permeability in millimeters per minute?
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- Given are the results from the liquid limit and plastic limit test for a soil sample. - Plastic Limit: PL = 18,7% Liquid Limit Test Number of Blows, N Moisture Content (%) 15 42 20 40.8 28 39.1 a) Draw the flow curve (to scale) and obtain the liquid limit of the soil sample. (5) b) Determine the plasticity index (PI) of the soil samplearrow_forwardDuring Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil.Liquid limit tests: Plastic limit tests: Students conducted two trials and found that PL = 17.2% for the first trial and PL = 17.8% for the second trial.a. Draw the flow curve and obtain the liquid limit.b. What is the plasticity index of the soil? Use an average value of PL from the two plastic limit trails.arrow_forwardResults 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_forward
- A 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_forwardA 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 following are the results from the liquid limit tests for a soil: Number of Blows, N Moisture Content, % 16 38.3 21 33.4 34 29.1 a) Draw the flow curve and obtain the liquid limit. b) If the Plastic Limit is determined to be 8%, what is the Plasticity Index of the soil? c) What is the Liquidity Index of the soil if the in situ w = 35%? What does this specific result tell us about this soil?arrow_forward
- A liquid limit test performed on a soil sample has the following results, compute for the value of the flow index. No. of blows Moisture content 20 40.8% 28 39.1%arrow_forwardFrom the observed data in a pycnometer test indicated in the table above, determine the specific gravityof the soil solids.arrow_forwardA falling head permeability test was run on a soil sample 9.60 cm in diameter and 10 cm long. The headat the start of the test was 90 cm . the coefficient of permeability of the soil was found to be 5x10-6cm/s. the diameter of the standpipe was 1 cm.a. Determine the rate of flow at the start of the test b. What will be rate of flow after 30 minutes?arrow_forward
- The laboratory tests on a sample of soil gave the following results: w = 24%, LL = 62%, PL = 28%, percentage of particles less than 2um = 23% Determine: (a) The liquidity index, (b) activity (c) consistency and nature of soilarrow_forwardThe consistency limits of a soil sample are: LL=52%, PL=35%, SL=17%. If a specimen of this soil shrinks from a volume of 10 cc at liquid limit to 6.1 cc at plastic limit, determine the specific gravity of solids. Answer should be Gs=2.65.arrow_forwardA stratified soil setup is shown in the figure. Using the tabulated values of properties and dimensions, determine the following:• Flow per unit length (L/day)• Equivalent coefficient of permeability (m/hr)Final answer should be in 3 decimal places.arrow_forward
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