The time required for 50% consolidation of a 25-mm-thick clay layer (drained at both top and bottom) in the laboratory is 3 min 15 sec. a. How long (in days) will it take for a 2-m-thick clay layer of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field, sand layers are present at the top and bottom of the clay layer. b. How long (in days) will it take in the field for 30% primary consolidation to occur? (You can use this relationship: where U is the percent of consolidation)

The time required for 50% consolidation of a 25-mm-thick clay layer (drained at both top and bottom) in the laboratory is 3 min 15 sec. a. How long (in days) will it take for a 2-m-thick clay layer of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field, sand layers are present at the top and bottom of the clay layer. b. How long (in days) will it take in the field for 30% primary consolidation to occur? (You can use this relationship: where U is the percent of consolidation)

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.15P

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The time required for 50% consolidation of a 25-mm-thick clay layer (drained at both top and bottom) in the laboratory is 3 min 15 sec. a. How long (in days) will it take for a 2-m-thick clay layer of the same clay in the field under the same pressure increment to reach 50% consolidation? In the field, sand layers are present at the top and bottom of the clay layer. b. How long (in days) will it take in the field for 30% primary consolidation to occur? (You can use this relationship: t (alpha) U² where U is the percent of consolidation)
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.
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.
The time required for a 50% consolidation of a 25 mm thick layer (drained at both and bottom) in the laboratory is 2min. 20 sec. a.) 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 theclay. b.) How long in days will it take in the field for 30% primary consolidation to occur? c.) From the application of given pressure the anticipated primaryconsolidation settlement is 0.064 mm. What is the average degree of consolidation for the clay layer when the settlement is 0.02 mm?
11.15 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 conso
The 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.
1.Laboratory tests on a 25mm thick clay specimen drained at both the top and bottom show that 50% consolidation takes place in 8.5 minutes. (a) 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? 2. Laboratory tests on a 25mm thick clay specimen drained at both the top and bottom show that 50% consolidation takes place in 8.5 minutes. (b) Find the time required for the clay layer in the field as described in part (a), to reach a 65% consolidation.
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.
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? a. 67,500 b. 65,000 c. 62,500 d. 60,000
The laboratory consolidation test is conducted on a clay sample. The following data results were obtained P1 =55 kPa P2 = 130 kPa e1= 0.95 e2= 0.80 Thickness of the sample of clay= 35mm Time for 50% consolidation = 3.0 min Tv= 0.197 a. Find the coefficient of volume compressibility b. Determine the coefficient of consolidation if a sample of clay was drained on both sides c. Compute the hydraulic conductivity of the clay
A soft to very soft silty clay layer 3 m thick exists between a layer of permeable clayey silty sand at top and a nearlyimpermeable layer of stiff silty clay at bottom. Oedometer tests were carried out on a sample of the soft clay 19mmthick. From the plot of ΔH versus log time, the value of time t100 (the time at 100% primary consolidation) was100 min. From the graph of e versus log σ' the compression index Cc was 0.32 and the void ratio ep at the end of theprimary consolidation was 0.72. Estimate the secondary compression of the silty clay layer that would occur fromtime of completion of the primary consolidation to 30 years of the load application in the field.
Laboratory 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.