Chapter 11, Problem 11.2P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

A rigid reinforced concrete foundation is subjected to a column load of 87,000 lbs. The foundation measures 8 ft × 8 ft in plan and rests on 21 ft of layered soil underlain by rock. The soil layers have the following characteristics:

If the foundation depth *D _{f}* = 4 ft and

To determine

Calculate the elastic settlement of the foundation.

Explanation

**Given information:**

The column load

The length of the foundation

The breadth of the foundation

The depth of foundation

The Poisson’s ratio

The depth below the foundation

The characteristics of soil layers are given in Table.

Layer type | Thickness | ||

Loose sand | 2,200 | 105 | |

Medium clay | 980 | 109 | |

Dense sand | 9,100 | 122 |

**Calculation:**

Calculate the elastic settlement for the perfectly flexible foundation

Here, *B* for corner of foundation,

Calculate the net applied pressure

Substitute *P*, *L*, and *B*.

Calculate the average modulus of elasticity of the soil under the foundation

Here, *H* or 5*B*, whichever is lesser.

Calculate

Substitute *H* and *B*.

Calculate the average modulus of elasticity of the soil under the foundation

Rephrase Equation (2) for the foundation.

Substitute

For the center of the foundation:

The factor

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