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Soilsch11a

# Soilsch11a - cohesive and cohesionless soils • cohesion(C...

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Foundation Construction Shallow Foundations

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Introduction Definition of a foundation shallow (footings) deep (or piles) Footings individual continuous or wall strap
Foundation Design Section 11.2 Resistance to bearing capacity failure Resistant to excessive settlements

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Background - Depth and Location Frost action effect of expansion and contraction Soil Volume change depth of 5 to 10 ft. below surface Groundwater construction (dewatering) reduced strength hydrostatic uplift frost action waterproofing problems

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Bearing Capacity Analysis Ultimate bearing capacity allowable bearing capacity factor of safety Terzaghi equations Cohesive soils Cohesionless soils
Equations Ultimate bearing capacity q(d) = 1.3cN c + γD f N q +0.4γBN γ Allowable bearing capacity, q(a) = q(d)/FS (factor of safety)

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Terzaghi bearing factors Table 11-2 bearing capacity factors for both

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Unformatted text preview: cohesive and cohesionless soils • cohesion (C) and angle of internal friction ( φ ) – cohesion, c=q c /2 • cohesive soils, φ is equal to zero – q(d) = 7.4c + γD f • cohesionless soil, c is equal to zero – q(d) = γD f N q +0.4γBN γ Effect of groundwater table on bearing capacity • Case 1 - groundwater is below the base of the footing at a distance greater than B. – γ = unit wt. of the soil • Case 2 - groundwater is at a distance B, or less, below the base of the footing – γ = unit weight of the soil – 62.4 pcf Structural Design of Footings • Size of Footing – Required base area of a footing is obtained by dividing the Column Load, Q, by the allowable bearing capacity, q(a). – Example problems SUMMARY • You can determine the following depending on what is given in the problem: – q(d) – q(a) – FS – Q(d) – Q(a) – B...
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