Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN: 9781337705028

Author: Braja M. Das, Nagaratnam Sivakugan

Publisher: Cengage Learning

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subject: Geotechnical Engineering

book: principle of foundation engineering - Braja M Das

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Q#3: For a normally consolidated clay layer in the field, the following values are given.
Thickness of clay layer = 2.6 m
Compression index = 0.28
Average effective pressure on clay layer 127 KN/m²
Secondary compression index = 0.02
Δσ’ = 46.5 KN/m²
Void ratio = 0.8
Time of Primary settlement = 1.5 years
What is the total consolidation of the clay layer five years after the primary consolidation settlement?

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For a normally consolidated clay layer in the field, the following values are given:Thickness of clay layer = 8.5 ftVoid ratio ?? = 0.8Compression index ?? = 0.28Average effective pressure on the clay layer ??′ = 2650 lb ft2 ⁄∆?′ = 970 lb ft2 ⁄Secondary compression index ?? = 0.02What is the total consolidation settlement of the clay layer five years after the completionof primary consolidation settlement? (Note: Time for completion of primary settlement= 1.5 years.)

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If a representative clay specimen 20 mm thick, under double drainage, took 121 minutes for 90% primary compression, estimate the time in days required for 50% primary compression of a field layer 2 m thick, bounded by impervious boundary at the bottom and sand at the top.
a.679
b.781
c.650
d.725

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