4) In the borehole B-11, a buried clay layer of 30 feet thick is sandwiched between strata of free- draining granular soil so that double drainage during consolidation can occur. Calculations indicate that, due to a planned building loading, an ultimate settlement of 2 in. is expected as a result of consolidation of the clay layer. The coefficient of consolidation for the clay is 0.01 ft2/day. a) How long will it take 90 percent of the estimated settlement to take place? b) How much settlement will occur in one year? c) How long will it take for one inch of the settlement to take place?

4) In the borehole B-11, a buried clay layer of 30 feet thick is sandwiched between strata of free- draining granular soil so that double drainage during consolidation can occur. Calculations indicate that, due to a planned building loading, an ultimate settlement of 2 in. is expected as a result of consolidation of the clay layer. The coefficient of consolidation for the clay is 0.01 ft2/day. a) How long will it take 90 percent of the estimated settlement to take place? b) How much settlement will occur in one year? c) How long will it take for one inch of the settlement to take place?

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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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.

Question

4) In the borehole B-11, a buried clay layer of 30 feet thick is sandwiched between strata of free-
draining granular soil so that double drainage during consolidation can occur. Calculations
indicate that, due to a planned building loading, an ultimate settlement of 2 in. is expected as a
result of consolidation of the clay layer. The coefficient of consolidation for the clay is 0.01
ft2/day.
a) How long will it take 90 percent of the estimated settlement to take place?
b) How much settlement will occur in one year?
c) How long will it take for one inch of the settlement to take place?

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