(b) Calculate the stress increase at the center of the clay layer and 1) beneath the foundation center and 2) beneath the edge of the foundation; (c) Calculate the consolidation settlement beneath the center of the foundation due to the stress increase; (d) Determine the settlement at the center of the clay after 1 year of applying the pressure; (e) A 50 mm thick clay sample was taken from the site and consolidated in the oedometer, how long it will take for the clay to reach 90% consolidation?
(b) Calculate the stress increase at the center of the clay layer and 1) beneath the foundation center and 2) beneath the edge of the foundation; (c) Calculate the consolidation settlement beneath the center of the foundation due to the stress increase; (d) Determine the settlement at the center of the clay after 1 year of applying the pressure; (e) A 50 mm thick clay sample was taken from the site and consolidated in the oedometer, how long it will take for the clay to reach 90% consolidation?
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter10: Mat Foundations
Section: Chapter Questions
Problem 10.8P
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Transcribed Image Text:A circular foundation (D = 6 m) is built on a construction site where the soil profile is shown in Figure 5 below. The
circular foundation applies a uniform pressure of 80 kPa to the surface of clay. The properties of the clay are:
Specific gravity, G₁
Saturated unit weight at
Compression index Ce
Recompression index Cr
Consolidation coefficient, c
Over-consolidation ratio, OCR
10 m
6m Ø
Clay
Impervious rock
Figure 5
2.6
20 kN/m³
0.25
0.10
2.5 m²/year
1.2
(b) Calculate the stress increase at the center of the clay layer and 1) beneath the foundation center and 2) beneath the
edge of the foundation;
(c) Calculate the consolidation settlement beneath the center of the foundation due to the stress increase;
(d) Determine the settlement at the center of the clay after 1 year of applying the pressure;
(e) A 50 mm thick clay sample was taken from the site and consolidated in the oedometer, how long it will take for the
clay to reach 90% consolidation?
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