Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 9, Problem 9.10P
To determine
Calculate the time taken for
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For a certain loading condition, a saturated
clay layer undergoes 40% consolidation
in a period of 160 days. What would be
additional time required for further 10%
consolidation to occur?
In an oedometer test, with half-closed drainage condition, a specimen of saturated clay 19 mm thick reaches 50%consolidation in 20 min. How long would it take a layer of this clay 5 m thick to reach the same degree of consolidation under the same stress and drainage conditions? How long would it take the layer to reach 30% consolidation?
A 3.75m clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 50 kPa to 150 kPa, the void ratio decreases from 0.9 to 0.75. The coefficient of permeability of the clay was 6 x 10^-7 cm/s.• How long (days) will it take to reach 50% consolidation?• What is the settlement when the soil reaches 50% consolidation?Final answer should be in 3 decimal places.
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Fundamentals of Geotechnical Engineering (MindTap Course List)
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- 3. A stratum of normally consolidated clay is 25 feet thick and the water content is measured as 50% (Gs=2.7). Consolidation tests on undisturbed samples of the clay indicate Ce = 0.68. On top of the clay is 5 feet of sand with a total unit weight of 120 pcf. To build a parking lot, 8 feet of fill is now placed on top of the sand. Tests on the fill indicate that the average water content is 10% and the average dry unit weight is 115 pef. The water table is located 2 ft below the ground surface. Calculate the settlement of the clay due to the added weight of the fill. Treat the clay as one layer and compute the stresses and change in void ratio at mid-depth in the clay.arrow_forward‘mormally consolidated clay given: 1S kKN/m® ateo=122 = 430 KN/m? ate=098 * 10° m/sec, Find: long in days will it take for a 3 m thick lsyer of the same drained both sides in the field to reach 50% consolidation? is settlement at 50% consolidation?arrow_forward, 3) Explain why natural clay does not show pozzolanic activity. What can be done to obtain clay which possess pozzolanic activity?arrow_forward
- Two specimens of fully saturated normally consolidated clay were isotropically consolidated to 150 kPa and 300 kPa, after which they had void ratios of 0.74 and 0.64 respectively. (i) Calculate the values of N and i defining the isotropic normal consolidation line for this clay. Hint: Use simultaneous equations.arrow_forwardA clay layer has consolidated in 5 years. The secondary compression in the next 7 years is 40 mm. How much additional secondary compression settlement would you expect within the next 10 years? Express your answers in mm rounded to the nearest whole number.arrow_forwardA laboratory sample of clay 2 cm thick took 15 min to attain 60 percent consolidation under a double drainage condition. What time (in days) will be required to attain the same degree of consolidation for a clay layer 3 m thick under the foundation of a building for a similar loading and drainage condition? a.17.15 b.119 c.234 d.564.3arrow_forward
- A 6 foot thick clay layer is determined to have the consolidation properties shown below. If the average in-situ stress is 500 psf and the preconsolidation stress is 1,000 psf, what is the settlement for this overconsolidated soil subjected to a stress increase of 2,000 psf.arrow_forwardA clay layer will take approximately 15 years to consolidate to 90%. Q: What will be the time in years to achieve the same percentage of consolidation if the layer is 2x thick, 3x more permeable and 4x more compressible? Round off your answer to the nearest whole number.arrow_forwardQuestion 7 During the glacial period, the in situ stress of a clay formation was approximately 20,000 psf. Today, the in situ stress of that same clay is approximately 9500 psf. Which of the values below are most likely the OCR of the clay? O 1.65 O2.10 O 0.50 1.00arrow_forward
- Under a given load a clay layer attains 30% degree of consolidation in 100 days. The time taken by the same clay layer to attain 60% degree of consolidation will be:arrow_forwardA clay layer consolidates after 6 years when its thickness is 5.70 m and the void ratio is 1.08. Assuming the secondary compression index in 0.04, estimate the secondary compression settlement in the next 15 years. Express your answer in mm rounded to the nearest whole number.arrow_forwardIn a reclamation project, the middle of a clay layer is under an initial effective vertical stress of 200 kPa and initial void The clay is ratio (eo) of 0.90. overconsolidated with OCR of 1.4, compression index of 0.34 and expansion index of 0.07. With an applied load of 299 kPa, what will be the final void ratio (e1) for the clay?arrow_forward
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