Laboratory consolidation tests were conducted on a specimen collected from the middle of the clay layer. The field consolidation curve interpolated from the laboratory test results is shown below: Void ratio, e 1.12 1.10 1.08 1.06 1.04 1.02 1.00 O 70 O 32.76 O 100 O 92.76 1.076 O 1.076 1.045 92.76 32.76 Pressure o' (log scale) (kN/m²) 70 The pre-consolidation pressure c Ae 100 kN/m²

Laboratory consolidation tests were conducted on a specimen collected from the middle of the clay layer. The field consolidation curve interpolated from the laboratory test results is shown below: Void ratio, e 1.12 1.10 1.08 1.06 1.04 1.02 1.00 O 70 O 32.76 O 100 O 92.76 1.076 O 1.076 1.045 92.76 32.76 Pressure o' (log scale) (kN/m²) 70 The pre-consolidation pressure c Ae 100 kN/m²

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.18P

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During the 1-dimensional consolidation test, the following measurements were made: Before commencement of the test: Diameter (mm) 49.7 Height (mm) Total mass of specimen (g) 19.9 66.843 After unloading the specimen: Total mass of specimen (g) 60.756 Oven dried mass of specimen (g) 42.197 Total change in dial reading (mm) 3.835 The initial void ratio e, is: O a. 2.55 O b. 2.17 O c. 2.72 O d. 2.94 е. 2.11
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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.
A series of unconsolidated undrained (UU) triaxial compression tests have been performed on two "identical" clay specimens. The test results are as follows: Test Number Confining Pressure (kPa)| Deviator Stress at Failure (kPa) 102 96 (i) (ii) 1 2 50 100 Plot the total stress Mohr circles for both specimens at failure (indicate the major and minor principal stresses on the plot). Draw the total stress Mohr-Coulomb failure envelop (i.e., the "p=0" envelop). Estimate the undrained shear strength.
3- Following are the results of a laboratory consolidation test on a sample of undisturbed clay obtained from the field. Final height of specimen (in) Pressure, o' (lb/ft') 1 0.9917 1,000 2,000 4,000 0.9843 0.956 0.9142 8,000 0.8685 16,000 0.8228 32.000 The height of the specimen at the beginning of the test was 1.0 inch, and the diameter was 2.5 inches. The moist specimen weighed 0.31 lb and the water content was determined to be 19%. Estimate the compression index and the preconsolidation pressure from the e-log o' curve. (Plot in Excel) Given: Gs = 2.7.
Prove the relationship between porosity and void ratio
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Please answer all questions based on the scenario Question #1: Considering the water upstream of the dam, a) What will be the seepage loss of that water downstream per year? b) What will the uplift force be on the dam? Question #2: What would the stress in the center of the dam be at the middle of the bottom layer? Consider both the overburden pressure and that due to the loading. Question #3: A sieve analysis was performed on a sample of the top layer of the soil, with the results shown below: Sieve Size (in.) 1/2 3/8 No. 4 No. 8 No. 16 No. 30 No. 40 No. 50 No. 100 No. 200 pan Amount retained (g) 0 0 21.6 39.5 77.6 102.6 89.1 95.6 90.6 60.4 33.3 Do the following: a) Calculate the percent retained and percent passing each sieve, and graph the results on a semi-log graph (you may use the attached chart, or graph in Excel and include with your submission). Then, characterize…
d) An oedometer test was also performed on a (saturated) reconstituted sample obtained at the site. The initial void ratio was calculated as 1.005 and the initial sample height was 20 mm. The following measurements were reported for each of the 24-hr stress increments: Table 4. Oedometer test measurements Normal stress (kPa) 1.5 13 26 52 104 208 416 Change in sample height (mm) 0.419 0.199 0.229 0.209 0.208 0.199 Plot the evolution of the void ratio resulting from the data above using semi-logarithmic axes (i.e. produce an e-log o'y plot). Is there anything you can comment on the stress history and consolidation state of the soil?
The following results were obtained from a set of consolidation test on a specimen of a clay sample taken from a 4.8 m thick clay layer on one of the construction site which are overlaid and underlain by a thick layer of coarse sand. Pressure (kN/m2) Void Ratio after the test 400 0.96 800 0.78 The initial thickness of the tested sample was 19.6 mm with a moisture content of 18%. The sample takes 8 minutes to achieve 25% of consolidation. 1. Estimate the total consolidation settlement of the clay layer based on the variation of the pressure as given in Table 2. Estimate the time to achieve 50% and 90% degree of consolidation and suggest ONE (1) method to accelerate the consolidation process of the above clay layer. Use sketches to support your answers.
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