A 10 m x 6 m mat foundation is placed at 2.0 m depth in sand where the average value of N60 is 23. Determine the allowable net pressure that would limit the settlement to 75 mm, using the following equations. Ngo (B + 0.32Inca (kN/m²) =0.08Fa(for B > 1.22 m)B25whereF = depth factor = 1 + 0.33(D;/ B)B = foundation width, in metersS = settlement, in mmwhereNg = standard penetration resistanceB = width (m)F = 1 + 0.33(D,/B) < 1.33S, = settlement, (mm)When the width B is large, the preceding equation can be approximated asIna (kN/m²)NgoFa0.0825D;1 + 0.33BSe(mm)0.0825[S,(mm) |< 16.63N025

Given data: Length (L) = 10 m Width (B) = 6 m Foundation Depth (Df) = 2 m N60 = 23 Settlement (Se) =…

Answered: A 10 m x 6 m mat foundation is placed…

A 10 m x 6 m mat foundation is placed at 2.0 m depth in sand where the average value of N60 is 23. Determine the allowable net pressure that would limit the settlement to 75 mm,

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter13: Slope Stability

Section: Chapter Questions

Problem 13.13P

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Question

A 10 m x 6 m mat foundation is placed at 2.0 m depth in sand where the average value of N₆₀ is 23. Determine the allowable net pressure that would limit the settlement to 75 mm, using the following equations.

Ngo (B + 0.3
2
Inca (kN/m²) =
0.08
Fa
(for B > 1.22 m)
B
25
where
F = depth factor = 1 + 0.33(D;/ B)
B = foundation width, in meters
S = settlement, in mm
where
Ng = standard penetration resistance
B = width (m)
F = 1 + 0.33(D,/B) < 1.33
S, = settlement, (mm)
When the width B is large, the preceding equation can be approximated as
Ina (kN/m²)
Ngo
Fa
0.08
25
D;
1 + 0.33
B
Se(mm)
0.08
25
[S,(mm) |
< 16.63N0
25

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