Answered: 2.5 m 0.5 m Sample 120 kN/m -2 m 1 m y…

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Civil Engineering

2.5 m 0.5 m Sample 120 kN/m -2 m 1 m y = 17.7 kN/m³ Ce = 0.190 Cv = 0.5 cm²/day eo = 0.83 Silty clay

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.15P

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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

Scenario

The wall footing at right is to be constructed to carry an inclined load at 85 degrees with the horizontal, as shown. Assume that there is impenetrable bedrock below the Sample point shown in the figure.

1) Calculate the expected primary settlement of the soil at the Sample point. Also, determine the time it will take for 60% of the expected primary settlement to occur.

2) Determine the factor of safety against bearing failure of the soil for the wall footing if qult of the soil is 160 kN/m2.

2.5 m
0.5 m
120 kN/m
2 m
1 m
y = 17.7 kN/m³
Sample Cc = 0.190
Cv = 0.5 cm²/day
eo = 0.83
Silty clay

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