A clay specimen with an initial height of 22 mm has been tested in an oedometer in the lab, allowing double-way drainage to occur. The clay specimen reached 80% of final consolidation after 25 min. How long would it take in days for the same clay with a thickness of 8 m in the field to reach 80% of its final consolidation if there are three permeable levels of sand, one sand layer overlying the clay, a second thin sand layer in the middle of the clay, and a third sand layer immediately below the clay? (Acceptable tolerance = 2%)

A clay specimen with an initial height of 22 mm has been tested in an oedometer in the lab, allowing double-way drainage to occur. The clay specimen reached 80% of final consolidation after 25 min. How long would it take in days for the same clay with a thickness of 8 m in the field to reach 80% of its final consolidation if there are three permeable levels of sand, one sand layer overlying the clay, a second thin sand layer in the middle of the clay, and a third sand layer immediately below the clay? (Acceptable tolerance = 2%)

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

An oedometer test is performed on a 2 cm thick clay sample. After 5 minutes, 50% consolidation is reached. After how long a time in no. of days would the same degree of consolidation be achieved in the field where the clay layer is 3.70 m thick? Assume the sample and the clay layer have the same drainage boundary conditions (double drainage).Show Diagram a.234 b.119 c.564.3 d.17.15
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,
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
An oedometer test is performed on a 2 cm thick clay sample. After 5 minutes, 50% consolidation is reached. After how long a time in no. of days would the same degree of consolidation be achieved in the field where the clay layer is 3.70 m thick? Assume the sample and the clay layer have the same drainage boundary conditions (double drainage). a.17.15 b.234 c.564.3 d.119 With Free Body Diagram
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.
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 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.
1.In an oedometer test 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 toreach the same degree of consolidation under the same stress and drainageconditions? How long would it take the layer to reach 30% consolidation?
During a consolidation test, an increment pressure of 153 kN/m2 was applied to a sample of saturated clay initially 20 mm thick. When equilibrium was reached the thickness of the sample was reduced to 18.3 mm. The pressure was then removed and the sample was allowed to expand. The final thickness was recorded as 19.3 mm and the final moisture content was 30.1%. If the specific gravity of the particles is 2.65 and the sample was saturated throughout the test, determine the following: 8.1 Voids ratio before and after consolidation. 8.2 The average coefficient of volume change over the range of pressure applied
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?
In an Oedometer test, the void ratio of a clay decreased from 0.652 to 0.51 under change in effective pressure from 60 KPa to 130 KPa. Under two-way drainage (for the same test) it was found that the required time to achieve 50% tso consolidation was 12 mins with the sample of thickness 12mm. Find the coefficient of permeability of the clay for the given stress range. No wrong answers please i will downvote and box the final answer