2.17 A clay specimen 25 mm thick (drained at top only) was tested in the laboratory. For a given load increment, the time for 60% consolidation was 6 min. How long will it take for 50% consolidation for a similar clay layer in the field that is 2.45 m thick and drained on both sides?

2.17 A clay specimen 25 mm thick (drained at top only) was tested in the laboratory. For a given load increment, the time for 60% consolidation was 6 min. How long will it take for 50% consolidation for a similar clay layer in the field that is 2.45 m thick and drained on both sides?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

2.17
A clay specimen 25 mm thick (drained at top only) was
tested in the laboratory. For a given load increment, the time
for 60% consolidation was 6 min. How long will it take for
50% consolidation for a similar clay layer in the field that is
2.45 m thick and drained on both sides?

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Н.W 1. For the one-dimensional consolidation test result shown in Figure below, determine my. 1.0 0.9 0.8 Void ratio 0.7 0.6 0.5 0.4 10,000 Vertical effective stress (log scale) - psf 100 1000 100,000 2- The following readings were taken for an increment of vertical stress of 400 psf in a one-dimensional consolidation test on a saturated clay sample 3 in diameter and 0.75 in thick. Drainage was permitted from the top and bottom boundaries. Determine the coefficient of consolidation using the root time method. Time (min) 0.25 ΔΗ (in) 1 2.25 4 9. 16 25 36 64 144 24 hours 0.0047 0.009 0.0133 0.0169 0.023 0.0268 0.0291 0.03 0.032 0.033 0.035
A laboratory sample of clay 2 cm thick took 15 min to attain 60 percent consolidation under a double drainage condition. a. What time 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? b. How long (in days) will it take in the field for 30% primary consolidation to occur?
Q1- In an Odometer test a specimen of saturated clay 26 mm thick reaches58% consolidation in 31 min. How long would it take a layer of this clay 5.8 m thick to reach the same degree of consolidation under the same stress and drainage condition? How long would it take the layer to reach 68% consolidation? What is the degree of consolidation after 2 and 28 years?
Kindly answe the question in the image given below (Q3)
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 x 10^-4 m2/Kn and value of k = 1.6 x 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. 62,500 b. 60,000 c. 65,000 d.67,500