EBK PRINCIPLES OF FOUNDATION ENGINEERIN
EBK PRINCIPLES OF FOUNDATION ENGINEERIN
8th Edition
ISBN: 8220100547058
Author: Das
Publisher: CENGAGE L
Question
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Chapter 7, Problem 7.1P
To determine

Find the average elastic settlement of the foundation.

Expert Solution & Answer
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Answer to Problem 7.1P

The average elastic settlement of the foundation is 246mm¯.

Explanation of Solution

Given information:

The width and length of the foundation is B×L=1.5m×3m

The depth of foundation Df is 1.2m.

The depth of bottom of foundation to rigid layer H is 3m.

The modulus of elasticity of clay Es is 600kN/m2

The net load per unit area of the foundation is qo is 150kN/m2.

Calculation:

Find the elastic settlement Se using the formula.

Se=A1A2qoBEs (1)

ConsiderA1 is relationship between depth of bottom of the foundation to a rigid layer H, length L and width of the foundation B.

A1=fHB,LB

HB=3m1.5m=2

LB=3m1.5m=2

ConsiderA2 is relationship between depth of foundation and width of foundation.

A2=fDfB

DfB=1.2m1.5m=0.8

Refer to figure 7.1 in the text book for finding A1 and A2 values.

Take A1 value as 0.69 for corresponding value as HB=2.

Take A2 value as 0.95 for corresponding value as DfB=0.8.

Find the elastic settlement using Equation (1).

Se=A1A2qoBEs=0.69×0.95×150kN/m2×1.5600kN/m2=0.246m=0.246m×1,000mm1m=246mm

Therefore, The average elastic settlement of the foundation is 246mm¯.

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