1.5m thick clay layer commences at a depth of approximately 2.5m below the ground surface and it is overlain by a relatively porous sandy soil and underlain by gravel and cobbles. The coefficient of vertical consolidation is 4 mm2/min. How long does it require to achieve 87% consolidation by preloading with large fill?

1.5m thick clay layer commences at a depth of approximately 2.5m below the ground surface and it is overlain by a relatively porous sandy soil and underlain by gravel and cobbles. The coefficient of vertical consolidation is 4 mm2/min. How long does it require to achieve 87% consolidation by preloading with large fill?

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.19P

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Concept explainers

Consolidation parameters

Consolidation is the process of expulsion of pore water present in the voids of soil solids under the pressure of the applied load. This is a quick process in the case of coarse-grained soils since the permeability is high due to the presence of more voids, while it is a slow and gradual process in the case of clayey soil as the permeability of clay is less. An example of consolidation is the settlement of soil under a building due to the load coming from the building.

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A 1.5m thick clay layer commences at a depth of approximately 2.5m below the ground surface and it is overlain by a relatively porous sandy soil and underlain by gravel and cobbles. The coefficient of vertical consolidation is 4 mm2/min. How long does it require to achieve 87% consolidation by preloading with large fill?

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