Answered: A Dry sand; e = 0.55 G, = 2.66 3 m. B…

A Dry sand; e = 0.55 G, = 2.66 3 m. B Water table 1.5 m Sand G, = 2.66 e = 0.48 5 m Clay w = 34.78% G, = 2.74 D Rock Figure P2.12 Pressure (kN/m²) Void ratio 150 0.91 300 0.792

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter16: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 16.12P

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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

Refer to the soil profile shown in Figure P2.12. The clay is normally consolidated. A laboratory consolidation test on the clay gave the results: If the average effective stress on the clay layer increase by 50 kN/m².
a. What would be the total consolidation settlement?
b. If C_v = 9.36 x 10^-4 cm²/sec, how long will it take for half the consolidation settlement to take place?

A
Dry sand; e = 0.55 G, = 2.66
3 m.
B
Water table
1.5 m
Sand G, = 2.66 e = 0.48
5 m
Clay w = 34.78% G, = 2.74
D
Rock
Figure P2.12

Pressure (kN/m²)
Void ratio
150
0.91
300
0.792

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