Principles of Foundation Engineering, SI Edition
Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305723351
Author: Braja M. Das
Publisher: Cengage Learning US
Question
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Chapter 8, Problem 8.1P
To determine

Find the net ultimate bearing capacity value for the given properties of mat foundation.

Expert Solution & Answer
Check Mark

Answer to Problem 8.1P

The value of net ultimate bearing capacity is 16.3kip/ft2¯.

Explanation of Solution

Given information:

The depth of the foundation Df is 6.2ft.

The length of the foundation L is 30ft.

The width of the foundation B is 20ft.

The coefficient of friction cuis 2,500lb/ft2.

The angle of friction ϕ is 0.

Calculation:

Find the net ultimate bearing capacity of mat foundation qnetu as follows:

qnetu=5.14cu1+0.195BL1+0.4DfB=5.14×2,500lb/ft21+0.195×20ft30ft1+0.46.2ft20ft=16321.04lb/ft2×103kip1lb=16.3kip/ft2

Therefore, the value of net ultimate bearing capacity is 16.3kip/ft2¯.

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For the design of a shallow foundation, given the following: Soil: ' = 20° c' = 52 kN/m² Unit weight, y = 15 kN/m³ Modulus of elasticity, E, = 1400 kN/m² Poisson's ratio, μs = 0.35 Foundation: L=2m B=1m Df = 1 m Calculate the ultimate bearing capacity. Use the equation: 1 - qu = c' NcFcs Fcd Fcc +qNqFqsFqdFqc + ½√BN√Fãs F√dƑxc 2 For '=20°, Nc = 14.83, N₁ = 6.4, and N₁ = 5.39. (Enter your answer to three significant figures.) qu = kN/m²
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