Bundle: Principles Of Geotechnical Engineering, Loose-leaf Version, 9th + Mindtap Engineering, 2 Terms (12 Months) Printed Access Card
9th Edition
ISBN: 9781337583817
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 11, Problem 11.16P
(a)
To determine
Calculate the coefficient of volume compressibility for the pressure range.
(b)
To determine
Calculate the hydraulic conductivity in
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The laboratory consolidation data for an undisturbed clay specimen are as follows:
e1 = 1.12 P₁ = 90 kPa
e2 = 0.90 P2 = 450 kPa
1. Compute the value of the compression index.
2. Compute the value of the swell index assuming it is equal to 1/6 the value of the compression index.
3. Compute the void ratio for a pressure of 600 kPa.
4. Compute the coefficient of compressibility.
5. Compute the value of the coefficient of volume compressibility.
b. If c, = 2.05 × 10-3 in./sec, determine k in ft/sec corresponding to the
average void ratio within the pressure range.
11.17 The time for 75% consolidation of a 25-mm clay specimen (drained at top
and bottom) in the laboratory is 22 minutes. How long will it take for a
6-m thick clay layer in the field to undergo 55% consolidation under the
same pressure increment? In the field, there is a rock layer at the bottom
of the clay.
Sample of clay isotropically normally compressed to an all round effective pressure of 100
kPa and then allowed to swell back to an effective isotropic pressure of 50 kPa. The sample is
then subjected to a standard drained compression test.
What is the deviator stress at failure and what is the volumetric strain experienced by the
sample at failure?
The second sample is subjected to a standard undrained compression test. What are the
deviator stress and pore pressure at failure, if there is initially back pressure of 50kPa?
Assume that the soil has the following critical state properties:
M = 0.95, λ = 0.093, K = 0.035, I = 2.06 and N= 2.118
Chapter 11 Solutions
Bundle: Principles Of Geotechnical Engineering, Loose-leaf Version, 9th + Mindtap Engineering, 2 Terms (12 Months) Printed Access Card
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- Subject: Soil Mechanics Please provide a solution and a diagram For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. a. 1.081 x 10^-3 b. 2.56 x 10^-2 c. 1.31 x 10^-7 d. 1.23 x10 ^-5arrow_forward11.11 An undisturbed clay has a preconsolidation pressure of 100 kN/m. A laboratory consolidation tests yield the following data: o' (kN/m?) e 0.92 0.77 150 300 Determine the void ratio that corresponds to a pressure of 450 kN/m?. DCengage Learing 2014arrow_forwardSoilarrow_forward
- For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the coefficient of consolidation in m2/m. Show free body diagram a.1.081 x 10^-3 b.1.23 x10 ^-5 c.1.31 x 10^-7 d.2.56 x 10^-2arrow_forwardRefer to the soil profile shown in figure below. A laboratory consolidation test on the clay gave the results: o'c = 100 kPa Cc = 0.4 Cs = 0.2Cc If the average effective stress on the clay layer increases by 60 kN/m², what would be the total consolidation settlement in cm. Dry sand; e = 0.55 G,= 2.66: Sand G₂ = 2.66 e = 0.48. Clay w 34.78% G₂ = 2.74 Rock 1.5 m. 5 m Water table;arrow_forwardFor a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m2arrow_forward
- The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/s. Estimate the coefficient of permeability at a void ratio of 0.48 using Casagrande equation.arrow_forwardA saturated clay specimen is subjected to a pressure of 240 kN/m2. After the lapse of a time, it is determined that the pore pressure in the specimen is 72 kN/m2. What is the degree of consolidation? Show free body diagram. a.75% b.60% c.70% d.65%arrow_forwardHomarrow_forward
- Question attachedarrow_forwardInstruction: Final answers must be placed in a box, and placed to the FOURTH place value after the decimal placearrow_forwardFor a normally consolidated clay layer in the field, the following values are given: Thickness of clay layer = 8.5 ft Void ratio = 0.8 • ● Compression index (Cc) = 0.28 Average effective pressure on the clay layer is 2650 lb/ft² Additional Overburden Pressure is 970 lb/ft² Secondary compression index (Ca) is 0.02 Determine the secondary compression settlement of the clay layer five years after the completion of primary consolidation settlement? (Note: Time for completion of primary settlement is 3 years.) Select the correct response: 0.7621" 0.4932 0.2363" 0.5524"arrow_forward
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