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
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
ISBN:9781305081550
Author:Braja M. Das
Publisher:Braja M. Das
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.
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