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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

A square footing on sand is subjected to an eccentric load as shown in Figure 16.20. Using Meyerhof’s effective area concept, determine the gross allowable load that the footing could carry with Fs = 4. Given: γ = 16 kN/m3, c′ = 0, ϕ′ = 29°, Df = 1.3 m, B = 1.75 m, and x = 0.25 m. Use Eqs. (16.32) through (16.42) for shape, depth, and inclination factors.

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To determine

Find the gross allowable load that the footing could carry using the effective area concept.

Explanation

Given information:

The unit weight of the soil γ is 16kN/m3.

The value of cohesion c is 0.

The soil friction angle ϕ is 29°.

The location of depth of footing base Df is 1.3 m.

The width of the footing B is 1.75 m.

The value of eccentricity x is 0.25 m.

The factor of safety value Fs is 4.

Calculation:

Determine the effective width of the footing using the relation.

B=B2x

Substitute 1.75 m for B and 0.25 for x.

B=1.752×0.25=1.25m

The effective length of the footing is taken as the larger value of B(1.75m) and B(1.25m).

Take L as 1.75 m.

Determine the shape factor λcs using the relation.

λcs=1+(BL)(NqNc)

Here, Nq and Nc is bearing-capacity factors.

Refer Table 16.2, “Bearing-capacity factors Nc, Nq, and Nγ” in the textbook.

For ϕ=29°;

The value of Nc is 27.86, Nq is 16.44, and Nγ is 19.34.

Substitute 1.25 m for B, 1.75 m for L, 16.44 for Nq, and 27.86 for Nc.

λcs=1+(1.251.75)(16.4427.86)=1.421

Determine the depth factor λcd using the relation.

λcd=1+0.4tan1(DfB)

Substitute 1.3 m for Df and 1.25 m for B.

λcd=1+0.4(1.31.25)=1.416

Determine the shape factor λqs using the relation.

λqs=1+(BL)tanϕ

Substitute 1.25 m for B, 1.75 m for L, and 29° for ϕ.

λqs=1+(1.251.75)tan29°=1.396

Determine the depth factor λqd using the relation.

λqd=1+2tanϕ(1sinϕ)2(DfB)

Substitute 29° for ϕ, 1.3 m for Df, and 1.25 m for B.

λqd=1+2tan29°(1sin29°)2(1

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