Problem 1 A 3 m thick saturated clay layer (single drained) under surcharge loading underwent 60% primary consolidation in 30 days. Calculate the coefficient of consolidation for the clay. If the ultimate consolidation settlement is 30 mm, calculate the settlement in 30 days.

Problem 1 A 3 m thick saturated clay layer (single drained) under surcharge loading underwent 60% primary consolidation in 30 days. Calculate the coefficient of consolidation for the clay. If the ultimate consolidation settlement is 30 mm, calculate the settlement in 30 days.

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

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

Problem 1
A 3 m thick saturated clay layer (single drained) under surcharge loading underwent 60% primary
consolidation in 30 days. Calculate the coefficient of consolidation for the clay.
If the ultimate consolidation settlement is 30 mm, calculate the settlement in 30 days.
Problem 2
How long (in days) will it take for a 3 ft clay layer in the field (double drained) to reach 60%
consolidation? Coefficient of consolidation for clay is 2.6 x 106 ft²/min.

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