11.4 11.4 The following are the results of a consolidation test on a sample of a clayey soil.Pressure, o(kN/m²)1.1131.1061.0660.9820.8550.7350.630.660.6750.68525501002004008001600800400200a. Plot the e-log o' curve.b. Using Casagrande's method, determine the preconsolidation pressure.c. Calculate the compression index, C, and the ratio of C/C

Answered: 11.4 The following are the results of a…

11.4 The following are the results of a consolidation test on a sample of a clayey soil. Pressure, o (kN/m²) 25 50 100 200 400 800 1.113 1.106 1.066 0.982 0.855 0.735

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.9P

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The following readings were obtained from an oedometer test on a specimen of saturated clay, see Table 1. The load being held constant for 24 hour before the addition of the next increment. Applied stress 25 50 100 200 400 800 (kN/m2) Thickness 19.60 19.25 18.98 18.61 18.14 17.68 17.24 (mm) Table 1 At the end of the last load period the load was removed and the sample allowed to expand for 24 hour, at the end of which time its thickness was 17.92 mm and its water content found to be 31.8%. The specific gravity of the soil was 2.66. i. Plot the e/o' curve and determine the coefficient of volume compressibility (m,) for an effective stress range of 220-360 kN/m? ii. Plot the e/log ơ' curve and from it determine the compressibility index (Cc) and the pre-consolidation pressure (Oʻpe) ii. Use the data obtained in (i), (ii) and (ii) to obtain and Plot a mlo' curve for the soil iv. compare the values for consolidation settlement for 4 m thick layer of the clay when the average effective…
The following figure shows a uniformly distributed load applied at the ground surface. A sample was obtained from the center of the clay layer, and the consolidation test results are shown below. Given: Δσ = 2,000 psf H1 = 10 ft H2 = 10 ft H3 = 40 ft eo(clay) = 1.25 γdry(sand) = 110 lb/ft3 γsat(sand) = 115 lb/ft3 γsat(clay) = 120 lb/ft3 Consolidation Test Results e σ' (tsf) 1.210 0.25 1.190 0.5 1.150 1 1.080 2 0.980 4 0.875 8 0.769 16 0.664 32 0.706 8 0.748 2 0.790 0.5 a) Determine the preconsolidation pressure, σc’ b) Determine the swell index, Cs
The following figure shows a uniformly distributed load applied at the ground surface. A sample was obtained from the center of the clay layer, and the consolidation test results are shown below. Given: Δσ = 2,000 psf H1 = 10 ft H2 = 10 ft H3 = 40 ft eo(clay) = 1.25 γdry(sand) = 110 lb/ft3 γsat(sand) = 115 lb/ft3 γsat(clay) = 120 lb/ft3 Consolidation Test Results e σ' (tsf) 1.210 0.25 1.190 0.5 1.150 1 1.080 2 0.980 4 0.875 8 0.769 16 0.664 32 0.706 8 0.748 2 0.790 0.5 a) Determine the compression index, Cc b) Calculate the primary consolidation settlement for the clay layer
The results of a laboratory consolidation test on a clay specimen are the following. Pressure, ir (lb/ft²) 500 1.000 2.000 4.000 8,000 16.000 Total height of specimen at end of consolidation (in.) 0.6947 0.6850 0.6705 0.6520 0.6358 0.6252 Given the initial height of specimen = 0.748 in.. G specimen = 95.2 g. and area of specimen = 4.91 in.²: a. Plot the e-log or curve = 2.68. mass of dry b. Determine the preconsolidation pressure c. Calculate the compression index, C.
Q # 2. The following are the results of a consolidation test on a sample of a clayey soil. Pressure, o'(kN/m²) e 1.116 25 1.108 50 1.055 100 0.962 200 0.845 400 0.755 800 0.65 1600 0.658 800 0.675 400 0.685 200 Plot the e, log o' curve. b. Using Casagrande's method, determine the preconsolidation pressure. c. Calculate the compression index, Ce, and the ratio of Cy/Cc. a. Note: Use excel for calculation and drawing. Discuss the details in your own words.)
The following are the results of a consolidation test on a sample of a clayey soil. • Plot the e-log o curve. • Determine the pre-consolidation pressure. • Calculate the compression index, Ce and the ratio of C; /Ce. Pressure, o' (kN/m?) 1.113 25 1.106 50 1.066 100 0.982 200 0.855 400 0.735 800 0.63 1600 0.66 800 0.675 400 0.685 200
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The following are the results of a consolidation test on a sample of a clayey soil. Pressure, o' (kN/m²) 1.113 25 1.106 50 1.066 100 0.982 200 0.855 400 0.735 800 0.63 1600 0.66 800 0.675 400 0.685 200 a. Plot the e-log o' curve. b. Using Casagrande's method, determine the preconsolidation pressure. Calculate the compression index, C, and the ratio of C/C.
Show solution. The answer must be A. 36.87 B. 14
1. Triaxial compression tests are done on quartzite rocks, the results are shown below. (0₁+03)/2 -964.25 14500 19575 23200 29000 43210 63075 psi (01-03)/2 964.25 14500 18850 21750 26100 35960 48575 psi Comment on the applicability of each of the Mohr-Coulomb, Griffith, and Hoek-Brown criteria for the testing results.
Homework
Following are the results of a consolidation test on a sample of undisturbed clay obtained from the field. Pressure ơ' (kN/m²) Final Height of Specimen (mm) 24 10 23.78 20 23.30 50 22.22 100 20.58 200 19.04 400 17.52 800 16.31 17.75 The height of the specimen at the beginning of the test was 24 mm and the area of specimen was 50 cm? volume of specimen was 120 cm³. The mass of dry specimen was 180.4 g. Gs= 2.68. 1. Plot the e-log ơ' curve, 2. Using Casagrande's method, determine the preconsolidation pressure. 3. Calculate the compression index, Cc