Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.9P
To determine

Find the degree of consolidation caused by the combination of vertical drainage and radial drainage.

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1. Under normal loading condition, a 3.6 m thick clay (normally consolidated) has P, = 190 KPa and e, =1.22. A surcharge of 190 KPa reduces its void ratio to 0.98. The hydraulic conductivity of the clay for the loading range is 6.1 x 10ʻ m/day. a. What is the coefficient of volume compressibility of the clay? b. What is the coefficient of consolidation of the clay? c. How long will it take for this clay layer to reach 60% consolidation if it is drained on one side only?
3. A layered soil is shown with the corresponding values K1, K2, and K3. a. Compute the equivalent horizontal coefficient of permeability b. Compute the equivalent vertical coefficient of permeability c. Compute the ratio of the equivalent horizontal coefficient of permeability to the equivalent vertical coefficient of permeability T H1= 3 m K1 =2 x 10 cm/s H2= 4 m K1 =3.2 x 10?cm/s H= 12 m H3= 5 m K1 =4.1 x 10 cm/s
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