Chapter 16, Problem 16.6P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

Redo Problem 16.2 using the modified general ultimate bearing capacity Eq. (16.31).

**16.1** A continuous footing is shown in Figure 16.17. Using Terzaghi’s bearing capacity factors, determine the gross allowable load per unit area (*q*_{all}) that the footing can carry. Assume general shear failure. Given: *γ* = 19 kN/m^{3}, *c*′ = 31kN/m^{2},
*D _{f}* = 1.5 m,

**Figure 16.17**

**6.2** Refer to Problem 16.1. If a square footing with dimension 2 m × 2 m is used instead of the wall footing, what would be the allowable bearing capacity?

To determine

Find the allowable bearing capacity using modified general ultimate bearing capacity.

Explanation

Given information:

The unit weight of the soil

The value of cohesion

The soil friction angle

The depth of foundation

The width of footing *B* is 2 m.

The factor of safety

The size of the footing is

Calculation:

Determine the shape factor

Here,

Refer Table 16.2, “Bearing-capacity factors

Take the

Substitute 2 m for *B*, 2 m for *L*, 14.72 for

Determine the depth factor

Substitute 1.5 m for *B*.

Determine the shape factor

Substitute 2 m for *B*, 2 m for *L*, and

Determine the depth factor

Substitute *B*.

Determine the depth factor

Substitute 2 m for *B* and 2 m for *L*.

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