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 4.2P
To determine
Find the liquid limit value by one point method.
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solve only 4.2 please.
4.2 Refer to the soil in Problem 4.1. A second group of students conducted only one test and found that the groove on the soil sample closed 12.5 mm when N = 21 and w = 30.4%. Estimate the liquid limit by the one-point method.
4.1 problem is provided below:
During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil.
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.
Question 8 (1) - Oedometer test
What are the boundary conditions applied to a soil sample tested in an Oedometer?
Z
H
a) Pore water pressure at z = H (top of the sample) is PH = Yw. H
b) Ez = Ex
c) &z=&v (₂ is the volumetric strain of the sample)
d) At time t=0, 4p = 0
During Atterberg limit tests in the soil mechanics laboratory, the students obtained
the following results from a clayey soil.
Number of Blows (N)
Moisture Content (%)
14
38.4
16
36.5
20
33.1
28
27.0
Plastic limit tests: Students conducted two trials and found that PL = 17.2% for the first trial
and PL = 18.4% for the second trial. Assume that the liquid limit of the soil is . LL = 29.0%
a. Determine the flow index.
b. Determine the liquidity index of the soil if the in situ moisture content is 22.0%.
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 series of direct shear tests were performed on a soil sample. Each test was carried out until the specimen sheared (failed). The laboratory data for the tests are tabulated as follows. Sample No. Normal stress (kN/m?) Shear stress (kN/m?) 1 10 22 2 20 26 3 30 30 50 37 Determine the shear strength parameters. What is the type of the soil? Plot the relationship between the shear displacement and shear stress also draw the failure envelope.arrow_forward2a. The following data was obtained from Liquid Limit Test conducted at a Soil Lab. Using the data given in Table 01, determine the following; Liquid Limit Determination Specimen No. No. of Blows Wt. of Container Wt. of Container + Wet Soil Wt. of Container + Dry Soil i. ii. Unit 1 14 (g) 7.17 (g) 27.97 (9) 21.37 2 20 7.37 27.37 21.27 3 28 7.77 28.47 22.37 4 32 10.97 30.17 24.67 I Determine the Liquid Limit and Flow Index If Plastic Limit of this soil is 22. Classify the soil based on BS Soil Classification system. 5 39 7.27 26.57 21.17arrow_forwardQ1/ specimen of the fine-grained soil, 75 mm in diameter and 20 mm thick was tested in an oedometer in a laboratory. At applying pressure (240 kN/m²), the time with dial gauge readings are: Time (min) 0 Settlement (mm) 0 0.25 1 0.22 0.42 Vertical pressure (kPa) 15 Settlement (mm) 0.1 Void ratio 1.88 4 0.6 30 0.11 1.87 9 0.71 16 0.79 And the void ratio and settlement for each load increment is shown in the table below. 60 0.21 1.85 120 1.13 1.72 100 1.04 36 64 0.91 0.86 240 2.17 1.57 480 3.15 1.43 1- Find Coefficient of consolidation in cm²/s using root time and TV90% = 0.848. 2- Find Preconsolidation pressure (oc) and compression index (Cc). Scanned by TapScannerarrow_forward
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