Weaker soil Y1 Stronger soil Y2 Sironger soil Y2 (a) Figure 5.12 (a) Foundation on weaker soil layer underlain by stronger sand layer, (b) Nature of variation of q, with H/B DIB HIB (b) where Ne0), Nạ0), N1) = bearing capacity factors corresponding to the soil friction angle p{ Na2), Ng2), Ny2) = bearing capacity factors corresponding to the soil friction angle o: Fe(1), Fqs(1), Fy«(1) = shape factors corresponding to the soil friction angle 4' Fea(2), F qs(2), F ye(2) = shape factors corresponding to the soil friction angle p; Meyerhof and Hanna (1978) suggested that D = B for loose sand and clay D = 2B for dense sand

Principles of Foundation Engineering (MindTap Course List)
8th Edition
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Author:Braja M. Das
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Chapter8: Mat Foundations
Section: Chapter Questions
Problem 8.7P
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Refer to Figure 5.12. For a rectangular foundation on layered sand, given:
●● B = 4 ft, L = 6 ft, H = 2 ft, Df = 3 ft
●● γ1 = 98 lb/ft3, Φ'1 = 30º, c'1 = 0
●● γ2 = 108 lb/ft3, Φ'2 = 38º, c'2 = 0
Using a factor of safety of 4, determine the gross allowable load the foundation can carry.

Weaker soil
Y1
Stronger soil
Y2
Sironger soil
Y2
(a)
Figure 5.12 (a)
Foundation on weaker
soil layer underlain by
stronger sand layer,
(b) Nature of variation
of q, with H/B
DIB
HIB
(b)
where
Ne0), Nạ0), N1) = bearing capacity factors corresponding to the soil friction angle p{
Na2), Ng2), Ny2) = bearing capacity factors corresponding to the soil friction angle o:
Fe(1), Fqs(1), Fy«(1) = shape factors corresponding to the soil friction angle 4'
Fea(2), F
qs(2),
F ye(2) = shape factors corresponding to the soil friction angle p;
Meyerhof and Hanna (1978) suggested that
D = B for loose sand and clay
D = 2B for dense sand
Transcribed Image Text:Weaker soil Y1 Stronger soil Y2 Sironger soil Y2 (a) Figure 5.12 (a) Foundation on weaker soil layer underlain by stronger sand layer, (b) Nature of variation of q, with H/B DIB HIB (b) where Ne0), Nạ0), N1) = bearing capacity factors corresponding to the soil friction angle p{ Na2), Ng2), Ny2) = bearing capacity factors corresponding to the soil friction angle o: Fe(1), Fqs(1), Fy«(1) = shape factors corresponding to the soil friction angle 4' Fea(2), F qs(2), F ye(2) = shape factors corresponding to the soil friction angle p; Meyerhof and Hanna (1978) suggested that D = B for loose sand and clay D = 2B for dense sand
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