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. (1) How long will it take for a similar clay layer in the field, 3.2 m thick, but drained at the top only, to undergo 50% consolidation? (2) Find the time required for the clay layer in the field as described in part (a) above, to reach a 65% consolidation.

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. (1) How long will it take for a similar clay layer in the field, 3.2 m thick, but drained at the top only, to undergo 50% consolidation? (2) Find the time required for the clay layer in the field as described in part (a) above, to reach a 65% consolidation.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.17P

See similar textbooks

Similar questions

Laboratory 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,
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. 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.
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.
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 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.
Q1: A clay specimen was tested in a laboratory consolidation device, which was 12.7 mm thick and the top & bottom boundaries were drained. A 50% consolidation time on the specimen was obtained as 28.4 minutes, Determine the Following: a- The time for 50% consolidation in the field with a 2.5 m thickness where ‘only the top layer is drained. b- The time for 90% consolidation in the field with a 2.5 m thickness where only the top layer is drained. c- For the same field condition above, find the settlement after 1year, if the final consolidation settlement = 0.0345 m.
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 diagram
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.
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.
A 3.2 m thick layer of saturated clay under a surcharge loading underwent 90% primary consolidation in 80 days with double drainage. 1.Determine the coefficient of consolidation for the pressure range. 2.For a 10 cm thick specimen of the said clay, how long will it take to undergo 90% consolidation in the laboratory for a similar pressure range?
A 10 ft thick clay layer of saturated clay (two-way drainage) under a loading underwent 90% primary consolidation in 400 days. The laboratory test’s specimen will have two-way drainage. Find the coefficient of consolidation of clay for the pressure range. For a 1 inch thick undisturbed clay specimen, how long will it take to undergo 80% consolidation in the laboratory for a similar pressure range?
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%