For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P1 = 50 kPa; P2 = 120 kPa; e1 = 0.92; e2 = 0.78; Time for 50% consolidation=2.5 min. Tv = 0.197. Determine the coefficient of compressibility in m2/kN.include fbd pls.

For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P1 = 50 kPa; P2 = 120 kPa; e1 = 0.92; e2 = 0.78; Time for 50% consolidation=2.5 min. Tv = 0.197. Determine the coefficient of compressibility in m2/kN.include fbd pls.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.5P

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For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P1 = 50 kPa; P2 = 120 kPa; e1 = 0.92; e2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the coefficient of compressibility in m2/kN.include fbd pls.
3. In a drained tri-axial test, a specimen is confined under pressure and axially loaded until failure. The failure conditions of the specimen are analyzed for shear strength. What is the value of the minor principle stress? Half the value of the major principle stress Twice the value of the major principle stress . The same as the confining pressure The same as the cohesion value ● ● ●
4.15 The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows 6 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 (а) Determine the liquid limit of this clay. (b) If the natural water content is 38% and the plastic limit is 23%, calculate the liquidity index. (c) Do you expect a brittle type of failure for this soil? Justify your answer.
5. Triaxial tests were conducted on undisturbed samples of clay under CU conditions. Data from the test are summarized in the Table 2. Graph the Mohr's circles and draw in the failure envelope. Determine the strength parameters c' and ("? Table 2. Data from CU Tests Cell pressure (3 (kPa) 359 719 719 Test A B C Pore pressure at Failure u (kPa) 339 585 451 Deviator Stress at Failure. (1-(3 (kPa) 539 731 1015
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Please give me right solution according to the question. In a triaxial test on a saturated clay, the sample was consolidated under a cell pressure of 160 kPa. After consolidation the cell pressure was increased to 350 kPa, and the sample was then failed under undrained condition. If the shear strength parameters of the soil are c’ = 15.2 kPa, ϕ’ = 26°, B = 1, Af = 0.27, determine the pore pressure at the failure.
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answer 10 onl 1. When consolidation of a saturated soil sample occurs, the degree of saturation A.Increases B.Decreases C.Remains constant D.May increase or decrease 2. The process opposite to consolidation is called swelling, which involves an increase in the volume of the voids due to the water content A.Decreasing B.Increasing C.Equalize D. None of the above 3. OC: is refer to A. An over consolidation ratio as the ratio of the preconsolidation pressure to the present vertical effective stress. (B. A normally consolidated clay is defined as a clay that has a present (in situ) vertical effective stress oo' equal to its preconsolidation pressure oc C. An overconsolidated clay is defined as a clay that has a present vertical effective stress of less than its preconsolidation pressure D. None of the above Сс 4. Coefficient of consolidation of a soil is affected by A.Compressibility B.Permeability C.Both compressibility and permeability D.None of the above 5. The shear strength of a soil…
specimen In a consolidated-drained triaxial test on aclay, the failed at the deviator Stress of 124 kN/m² effective stress friction angle is known tod 31° 31 What was the effective confining pressure at failure? If the be -
STATEMENTS: A - an increase in volume is expected in 2:1 expanding type of clay when wet/saturated with water. B - cracking is expected when an expanding type of clay dries. A- both statements are trueB- neither statements are trueC- only statement A is true D- only statement B is true
During Atterberg limit tessts in the Naboratory,the studens obtained the following results froma clayey soil. Wumber of Blows (N) Molsture Content \ 38/4 16 36/5 20 33.1 28 2/7 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%.
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.