Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 11, Problem 11.17P
To determine
Calculate time taken for
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The time for 65% consolidation of a 19-mm clay specimen (drained at top and bottom) in the laboratory is 10 minutes. How long will it take for a 4-m-thick clay layer in the field to undergo 40% consolidation under the same pressure increment? In the field, there is a rock layer at the bottom of the clay.
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 (same clay) 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 layer.
The time required for 50% consolidation of a 25 mm thick layer (drained at both top and bottom) in the laboratory is 2 min 20 sec.
How long in days will it take for a 3 m thick layer clay of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field there is a rock layer at the bottom of the clay.
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Principles of Geotechnical Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- The time required for 50% consolidation of a 20 mm- thick clay layer(drained at both top and bottom) in the laboratory is 2min 50 sec. How long (in days) will it take for a 3-m- thick clay layer of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field, there is a rock layer at the bottom of the clay.arrow_forwardThe time required for a 50% consolidation of a 25 mm thick layer (drained at both sides) in the laboratory is 2 min and 20 sec. How long in days will it take for a 3 m thick layer of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field there is a rock layer at the bottom of the clay.arrow_forwardThe time for 50% consolidation of a 1-in. thick clay layer (drained at top and bottom) in the laboratory is 2 min, 20 sec. How long (in days) will it take for an 8-ft thick layer of the same clay in the field (under the same pressure increment) to reach 30% consolidation? In the field, there is a rock layer at the bottom of the clay.arrow_forward
- A clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The load is increased to 197.5 kN/m2. The coefficient of volume compressibility is 5.79 × 10^–4 m2/Kn and value of k = 1.6 × 10^–8 m/min. If the test sample is 2 cm thick and attains 100% consolidation in 24 hours, what is the time in days taken for 100% consolidation in the actual layer? Show diagramarrow_forwardLaboratory test on a 35 mm thick clay specimen drained just at the top show that 60% consolidation takes place 9.5 minutes. a) How long will it take for a similar clay layer in the field, 3,6 m thick, but drained at both the top and bottom, to undergo 60% consolidation? b) Find the time required for the clay layer in the field as described in part (a) above to reach 70% consolidation,arrow_forwardA clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The load is increased to 197.5 kN/m2. The coefficient of volume compressibility is 5.79 × 10^–4 m2/Kn and value of k = 1.6 × 10^–8 m/min. If the test sample is 2 cm thick and attains 100% consolidation in 24 hours, what is the time in days taken for 100% consolidation in the actual layer? a. 67,500 b. 65,000 c. 62,500 d. 60,000arrow_forward
- A 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_forwardLaboratory tests on a 25mm thick clay specimen drained at both the top and bottom show that 50% consolidation takes place in 8.5 minutes. Find the time required for the clay layer in the field as described in How long will it take for a similar clay layer in the field, 3.2 m thick, but drained at the top and bottom, to undergo 50% consolidation, to reach a 65% consolidation.arrow_forwardLaboratory tests on a 25-mm-thick clay specimen drained at the top and bot-tom show that 50% consolidation takes place in 8.5 min.a. How long will it take for a similar clay layer in the field, 3.2 m thick anddrained at the top only, to undergo 50% consolidation?b. Find the time required for the clay layer in the field described in part (a)to reach 65% consolidation.arrow_forward
- 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?arrow_forwardThe time required for a 50% consolidation of a 25mm thick layer drained both sides is 2 min 20 seconds. • How long (days) will it take for a 3m thick clay layer of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field, there is a rock layer at the bottom of the clay• How long in days will it take to reach 30% consolidation?• The predicted primary settlement for the lab specimen is 0.064mm. What is the average degree of consolidation when the settlement reached 0.02mm?arrow_forward11.15 The time for 65% consolidation of a 19-mm clay specimen (drained at top and bottom) in the laboratory is 10 minutes. How long will it take for a 4-m-thick clay layer in the field to undergo 40% consolidation under the same pressure increment? In the field, there is a rock layer at the bottom of the clay. 11.16 A 3.75 m clay layer in the field (drained on one side) is normally consoarrow_forward
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